{"status":"success","metadata":{"ticker":"PGR","year":2025,"quarter":3,"full_year_mode":false,"total_facts":1198,"prior_comparison_available":true,"source":{"filing_type":"10-Q","period_end":"September 30, 2025","url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129","value_scale":"millions"},"match_rate":{"quarterly":0.9577294685990339,"ytd":0.8125,"instants":1.0,"fallback":0.0},"final_match_rate":1.0,"match_diagnostics":{"quarterly":{"same_filing_q":{"current_count":828,"matched_count":793,"match_rate":0.9577294685990339,"prior_count":862,"match_keys":["tag","date_type","axis_key"],"raw_current_row_count":885,"output_row_count":850,"current_duplicate_group_count":52,"prior_duplicate_group_count":52,"shared_key_count":793},"prior_year_ytd":{"current_count":272,"matched_count":221,"match_rate":0.8125,"prior_count":271,"match_keys":["tag","date_type","axis_key"],"raw_current_row_count":272,"output_row_count":221},"prior_year_instant":{"current_count":348,"matched_count":348,"match_rate":1.0,"prior_count":378,"match_keys":["tag","end","date_type","presentation_role","axis_key"],"raw_current_row_count":348,"current_duplicate_group_count":29,"prior_duplicate_group_count":29,"current_only_count":18,"output_row_count":348},"fallback":{"current_count":2,"matched_count":0,"match_rate":0.0,"prior_count":7,"match_keys":["tag","end","date_type","axis_key"],"raw_current_row_count":2,"missing_tag_count":10,"output_row_count":0},"final":{"current_count":828,"matched_count":828,"match_rate":1.0,"raw_current_row_count":885,"output_row_count":1426,"current_only_added_count":7,"fallback_added_count":0,"overlap_prior_value_count":0}}}},"facts":[{"tag":"us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent","date_type":"Q","period_type":"instant","presentation_role":"basisofreportingandaccountingadditionalinformationdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingadditionalinformationdetails","parent":"us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current","current_period_value":112,"prior_period_value":150.0,"visual_current_value":112,"visual_prior_value":150.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-490","text_snippet":"112","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-491","text_snippet":"150","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":112,"prior_value":150.0},{"tag":"us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent","date_type":"Q","period_type":"instant","presentation_role":"basisofreportingandaccountingadditionalinformationdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingadditionalinformationdetails","parent":"us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current","current_period_value":112,"prior_period_value":null,"visual_current_value":112,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-490","text_snippet":"112","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":112,"prior_value":null},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsPeriodIncreaseDecrease","date_type":"Q","period_type":"duration","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)","current_period_value":211,"prior_period_value":167.0,"visual_current_value":211,"visual_prior_value":167.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-478","text_snippet":"211","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-479","text_snippet":"167","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":211,"prior_value":167.0},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)","current_period_value":540,"prior_period_value":402.0,"visual_current_value":540,"visual_prior_value":402.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-480","text_snippet":"540","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-481","text_snippet":"402","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":540,"prior_value":402.0},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)","current_period_value":540,"prior_period_value":402.4,"visual_current_value":540,"visual_prior_value":402.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-480","text_snippet":"540","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-504","text_snippet":"402.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":540,"prior_value":402.4},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance","date_type":"Q","period_type":"duration","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss, Writeoff","current_period_value":196,"prior_period_value":107.0,"visual_current_value":-196,"visual_prior_value":-107.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-482","text_snippet":"196","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-483","text_snippet":"107","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-196,"prior_value":-107.0},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance","date_type":"YTD","period_type":"duration","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss, Writeoff","current_period_value":484,"prior_period_value":383.0,"visual_current_value":-484,"visual_prior_value":-383.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-484","text_snippet":"484","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-485","text_snippet":"383","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-484,"prior_value":-383.0},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance","date_type":"YTD","period_type":"duration","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","presentation_hierarchy":[{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss, Writeoff","current_period_value":484,"prior_period_value":383.5,"visual_current_value":-484,"visual_prior_value":-383.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-484","text_snippet":"484","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-508","text_snippet":"383.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-484,"prior_value":-383.5},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts","date_type":"Q","period_type":"instant","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails|consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null},{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss","current_period_value":516,"prior_period_value":388.0,"visual_current_value":516,"visual_prior_value":388.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-200","text_snippet":"516","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-201","text_snippet":"388","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":516,"prior_value":388.0},{"tag":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts","date_type":"Q","period_type":"instant","presentation_role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails|consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null},{"role":"basisofreportingandaccountingreportingandaccountingpoliciesallowanceforcreditlossdetails","parent":"us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Premium Receivable, Allowance for Credit Loss","current_period_value":516,"prior_period_value":null,"visual_current_value":516,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-200","text_snippet":"516","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":516,"prior_value":null},{"tag":"pgr:DebtSecuritiesAvailableforsaleFixedMaturities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Fixed maturities (amortized cost: $88,247, $74,595, and $77,126)","current_period_value":88509,"prior_period_value":74411.0,"visual_current_value":88509,"visual_prior_value":74411.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-158","text_snippet":"88,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-159","text_snippet":"74,411","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88509,"prior_value":74411.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleFixedMaturities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Fixed maturities (amortized cost: $88,247, $74,595, and $77,126)","current_period_value":88509,"prior_period_value":74411.2,"visual_current_value":88509,"visual_prior_value":74411.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-158","text_snippet":"88,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-162","text_snippet":"74,411.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88509,"prior_value":74411.2},{"tag":"pgr:EquitySecuritiesFVNICommonEquities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:EquitySecuritiesFvNi","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:EquitySecuritiesFvNi","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Common equities (cost: $808, $733, and $745)","current_period_value":4047,"prior_period_value":3497.0,"visual_current_value":4047,"visual_prior_value":3497.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-179","text_snippet":"4,047","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-180","text_snippet":"3,497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4047,"prior_value":3497.0},{"tag":"pgr:EquitySecuritiesFVNINonredeemablePreferredStock","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:EquitySecuritiesFvNi","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:EquitySecuritiesFvNi","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Nonredeemable preferred stocks (cost: $454, $760, and $756)","current_period_value":438,"prior_period_value":735.0,"visual_current_value":438,"visual_prior_value":735.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-173","text_snippet":"438","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-174","text_snippet":"735","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":438,"prior_value":735.0},{"tag":"us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Accounts Payable and Accrued Liabilities","current_period_value":10267,"prior_period_value":8318.0,"visual_current_value":10267,"visual_prior_value":8318.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-236","text_snippet":"10,267","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-237","text_snippet":"8,318","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":10267,"prior_value":8318.0},{"tag":"us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Accounts Payable and Accrued Liabilities","current_period_value":10267,"prior_period_value":8317.4,"visual_current_value":10267,"visual_prior_value":8317.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-236","text_snippet":"10,267","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-240","text_snippet":"8,317.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":10267,"prior_value":8317.4},{"tag":"us-gaap:AccruedInvestmentIncomeReceivable","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Accrued Investment Income Receivable","current_period_value":691,"prior_period_value":560.0,"visual_current_value":691,"visual_prior_value":560.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-197","text_snippet":"691","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-198","text_snippet":"560","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":691,"prior_value":560.0},{"tag":"us-gaap:AccruedInvestmentIncomeReceivable","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Accrued Investment Income Receivable","current_period_value":691,"prior_period_value":560.3,"visual_current_value":691,"visual_prior_value":560.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-197","text_snippet":"691","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-201","text_snippet":"560.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":691,"prior_value":560.3},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,4.0,3,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax","current_period_value":203,"prior_period_value":-140.0,"visual_current_value":203,"visual_prior_value":-140.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-266","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-267","text_snippet":"140","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":203,"prior_value":-140.0},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,4.0,3,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax","current_period_value":203,"prior_period_value":-139.7,"visual_current_value":203,"visual_prior_value":-139.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-266","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-289","text_snippet":"139.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":203,"prior_value":-139.7},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,4.0,3,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Stockholders' Equity"}],"concept_label":"Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax","current_period_value":-1,"prior_period_value":-1.0,"visual_current_value":-1,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-272","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-273","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:AdditionalPaidInCapitalCommonStock","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Additional Paid in Capital, Common Stock","current_period_value":2233,"prior_period_value":2096.0,"visual_current_value":2233,"visual_prior_value":2096.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-260","text_snippet":"2,233","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-261","text_snippet":"2,096","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2233,"prior_value":2096.0},{"tag":"us-gaap:AdditionalPaidInCapitalCommonStock","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Additional Paid in Capital, Common Stock","current_period_value":2233,"prior_period_value":2096.2,"visual_current_value":2233,"visual_prior_value":2096.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-260","text_snippet":"2,233","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-283","text_snippet":"2,096.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2233,"prior_value":2096.2},{"tag":"us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,4.0,3,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax","current_period_value":-13,"prior_period_value":-14.0,"visual_current_value":-13,"visual_prior_value":-14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-269","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-270","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-13,"prior_value":-14.0},{"tag":"us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,4.0,3,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax","current_period_value":-13,"prior_period_value":-13.7,"visual_current_value":-13,"visual_prior_value":-13.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-269","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-292","text_snippet":"13.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-13,"prior_value":-13.7},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":19.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,19.0,18],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":121535,"prior_period_value":105203.0,"visual_current_value":121535,"visual_prior_value":105203.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-227","text_snippet":"121,535","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-228","text_snippet":"105,203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":121535,"prior_value":105203.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":19.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,19.0,18],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":121535,"prior_period_value":105202.5,"visual_current_value":121535,"visual_prior_value":105202.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-227","text_snippet":"121,535","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-231","text_snippet":"105,202.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":121535,"prior_value":105202.5},{"tag":"us-gaap:Cash","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Cash","current_period_value":173,"prior_period_value":136.0,"visual_current_value":173,"visual_prior_value":136.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-188","text_snippet":"173","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-189","text_snippet":"136","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":173,"prior_value":136.0},{"tag":"us-gaap:Cash","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Cash","current_period_value":173,"prior_period_value":136.1,"visual_current_value":173,"visual_prior_value":136.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-188","text_snippet":"173","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-192","text_snippet":"136.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":173,"prior_value":136.1},{"tag":"us-gaap:CommonStockValueOutstanding","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Common Stock, Value, Outstanding","current_period_value":586,"prior_period_value":586.0,"visual_current_value":586,"visual_prior_value":586.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-257","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-258","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":586,"prior_value":586.0},{"tag":"us-gaap:CommonStockValueOutstanding","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Common Stock, Value, Outstanding","current_period_value":586,"prior_period_value":585.8,"visual_current_value":586,"visual_prior_value":585.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-257","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-280","text_snippet":"585.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":586,"prior_value":585.8},{"tag":"us-gaap:DeferredIncomeTaxAssetsNet","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,17.0,16],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":9.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":9.0,"section_label":null}],"concept_label":"Deferred Income Tax Assets, Net","current_period_value":662,"prior_period_value":598.0,"visual_current_value":662,"visual_prior_value":598.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-221","text_snippet":"662","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-222","text_snippet":"598","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":662,"prior_value":598.0},{"tag":"us-gaap:DeferredPolicyAcquisitionCosts","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":15.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,15.0,14],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":7.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":7.0,"section_label":null}],"concept_label":"Deferred Policy Acquisition Cost","current_period_value":2164,"prior_period_value":2032.0,"visual_current_value":2164,"visual_prior_value":2032.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-212","text_snippet":"2,164","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-213","text_snippet":"2,032","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2164,"prior_value":2032.0},{"tag":"us-gaap:DeferredPolicyAcquisitionCosts","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":15.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,15.0,14],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":7.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":7.0,"section_label":null}],"concept_label":"Deferred Policy Acquisition Cost","current_period_value":2164,"prior_period_value":2031.6,"visual_current_value":2164,"visual_prior_value":2031.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-212","text_snippet":"2,164","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-216","text_snippet":"2,031.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2164,"prior_value":2031.6},{"tag":"us-gaap:Investments","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Investments","current_period_value":94509,"prior_period_value":79400.0,"visual_current_value":94509,"visual_prior_value":79400.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-185","text_snippet":"94,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-186","text_snippet":"79,400","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":94509,"prior_value":79400.0},{"tag":"us-gaap:Investments","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Investments","current_period_value":94509,"prior_period_value":79399.7,"visual_current_value":94509,"visual_prior_value":79399.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-185","text_snippet":"94,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-189","text_snippet":"79,399.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":94509,"prior_value":79399.7},{"tag":"us-gaap:Liabilities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Liabilities","current_period_value":86090,"prior_period_value":78044.0,"visual_current_value":86090,"visual_prior_value":78044.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-242","text_snippet":"86,090","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-243","text_snippet":"78,044","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":86090,"prior_value":78044.0},{"tag":"us-gaap:Liabilities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Liabilities","current_period_value":86090,"prior_period_value":78043.2,"visual_current_value":86090,"visual_prior_value":78043.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-242","text_snippet":"86,090","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-246","text_snippet":"78,043.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":86090,"prior_value":78043.2},{"tag":"us-gaap:LiabilitiesAndStockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Liabilities and Equity","current_period_value":121535,"prior_period_value":105203.0,"visual_current_value":121535,"visual_prior_value":105203.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-281","text_snippet":"121,535","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-282","text_snippet":"105,203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":121535,"prior_value":105203.0},{"tag":"us-gaap:LiabilitiesAndStockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Liabilities and Equity","current_period_value":121535,"prior_period_value":105202.5,"visual_current_value":121535,"visual_prior_value":105202.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-281","text_snippet":"121,535","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-304","text_snippet":"105,202.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":121535,"prior_value":105202.5},{"tag":"us-gaap:OtherAssets","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":18.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,18.0,17],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":10.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":10.0,"section_label":null}],"concept_label":"Other Assets","current_period_value":1693,"prior_period_value":1537.0,"visual_current_value":1693,"visual_prior_value":1537.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-224","text_snippet":"1,693","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-225","text_snippet":"1,537","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1693,"prior_value":1537.0},{"tag":"us-gaap:OtherAssets","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":18.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,18.0,17],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":10.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":10.0,"section_label":null}],"concept_label":"Other Assets","current_period_value":1693,"prior_period_value":1536.2,"visual_current_value":1693,"visual_prior_value":1536.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-224","text_snippet":"1,693","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-228","text_snippet":"1,536.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1693,"prior_value":1536.2},{"tag":"us-gaap:PremiumsReceivableAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":4.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Premiums Receivable, Net","current_period_value":16519,"prior_period_value":15135.0,"visual_current_value":16519,"visual_prior_value":15135.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-203","text_snippet":"16,519","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-204","text_snippet":"15,135","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16519,"prior_value":15135.0},{"tag":"us-gaap:PremiumsReceivableAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":4.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Premiums Receivable, Net","current_period_value":16519,"prior_period_value":15135.4,"visual_current_value":16519,"visual_prior_value":15135.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-203","text_snippet":"16,519","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-207","text_snippet":"15,135.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16519,"prior_value":15135.4},{"tag":"us-gaap:PrepaidReinsurancePremiums","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,14.0,13],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":6.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Prepaid Reinsurance Premiums","current_period_value":215,"prior_period_value":224.0,"visual_current_value":215,"visual_prior_value":224.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-209","text_snippet":"215","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-210","text_snippet":"224","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":215,"prior_value":224.0},{"tag":"us-gaap:PropertyPlantAndEquipmentNet","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,16.0,15],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":8.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":8.0,"section_label":null}],"concept_label":"Property, Plant and Equipment, Net","current_period_value":790,"prior_period_value":689.0,"visual_current_value":790,"visual_prior_value":689.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-218","text_snippet":"790","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-219","text_snippet":"689","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":790,"prior_value":689.0},{"tag":"us-gaap:PropertyPlantAndEquipmentNet","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,16.0,15],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":8.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":8.0,"section_label":null}],"concept_label":"Property, Plant and Equipment, Net","current_period_value":790,"prior_period_value":688.8,"visual_current_value":790,"visual_prior_value":688.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-218","text_snippet":"790","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-222","text_snippet":"688.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":790,"prior_value":688.8},{"tag":"us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,13.0,12],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":5.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments","current_period_value":4107,"prior_period_value":4881.0,"visual_current_value":4107,"visual_prior_value":4881.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-206","text_snippet":"4,107","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-207","text_snippet":"4,881","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":4107,"prior_value":4881.0},{"tag":"us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,13.0,12],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":5.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments","current_period_value":4107,"prior_period_value":4881.5,"visual_current_value":4107,"visual_prior_value":4881.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-206","text_snippet":"4,107","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-210","text_snippet":"4,881.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":4107,"prior_value":4881.5},{"tag":"us-gaap:RestrictedCashAndCashEquivalents","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Restricted Cash and Cash Equivalent","current_period_value":12,"prior_period_value":11.0,"visual_current_value":12,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-191","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-192","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":11.0},{"tag":"us-gaap:RestrictedCashAndCashEquivalents","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Restricted Cash and Cash Equivalent","current_period_value":12,"prior_period_value":10.9,"visual_current_value":12,"visual_prior_value":10.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-191","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-195","text_snippet":"10.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":10.9},{"tag":"us-gaap:RetainedEarningsAccumulatedDeficit","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Stockholders' Equity"}],"concept_label":"Retained Earnings (Accumulated Deficit)","current_period_value":32437,"prior_period_value":24632.0,"visual_current_value":32437,"visual_prior_value":24632.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-263","text_snippet":"32,437","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-264","text_snippet":"24,632","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32437,"prior_value":24632.0},{"tag":"us-gaap:RetainedEarningsAccumulatedDeficit","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":3.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Stockholders' Equity"}],"concept_label":"Retained Earnings (Accumulated Deficit)","current_period_value":32437,"prior_period_value":24631.7,"visual_current_value":32437,"visual_prior_value":24631.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-263","text_snippet":"32,437","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-286","text_snippet":"24,631.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32437,"prior_value":24631.7},{"tag":"us-gaap:ShortTermInvestments","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Short-Term Investments","current_period_value":1515,"prior_period_value":757.0,"visual_current_value":1515,"visual_prior_value":757.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-164","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-165","text_snippet":"757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":757.0},{"tag":"us-gaap:ShortTermInvestments","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Short-Term Investments","current_period_value":1515,"prior_period_value":756.5,"visual_current_value":1515,"visual_prior_value":756.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-164","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-168","text_snippet":"756.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":756.5},{"tag":"us-gaap:UnearnedPremiums","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Unearned Premiums","current_period_value":26822,"prior_period_value":24772.0,"visual_current_value":26822,"visual_prior_value":24772.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-230","text_snippet":"26,822","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-231","text_snippet":"24,772","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":26822,"prior_value":24772.0},{"tag":"us-gaap:UnearnedPremiums","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Unearned Premiums","current_period_value":26822,"prior_period_value":24772.5,"visual_current_value":26822,"visual_prior_value":24772.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-230","text_snippet":"26,822","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-234","text_snippet":"24,772.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":26822,"prior_value":24772.5},{"tag":"pgr:DebtSecuritiesAvailableforSaleFixedMaturitiesAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fixed maturities, amortized cost","current_period_value":88247,"prior_period_value":74595.0,"visual_current_value":88247,"visual_prior_value":74595.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-155","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-156","text_snippet":"74,595","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.0},{"tag":"pgr:DebtSecuritiesAvailableforSaleFixedMaturitiesAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fixed maturities, amortized cost","current_period_value":88247,"prior_period_value":74595.2,"visual_current_value":88247,"visual_prior_value":74595.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-155","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-159","text_snippet":"74,595.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.2},{"tag":"pgr:DebtSecuritiesAvailableforSaleShortTermInvestmentsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Short-term investments, amortized cost","current_period_value":1515,"prior_period_value":757.0,"visual_current_value":1515,"visual_prior_value":757.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-161","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-162","text_snippet":"757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":757.0},{"tag":"pgr:DebtSecuritiesAvailableforSaleShortTermInvestmentsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Short-term investments, amortized cost","current_period_value":1515,"prior_period_value":756.5,"visual_current_value":1515,"visual_prior_value":756.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-161","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-165","text_snippet":"756.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":756.5},{"tag":"pgr:EquitySecuritiesCommonEquitiesCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Common equities, cost","current_period_value":808,"prior_period_value":733.0,"visual_current_value":808,"visual_prior_value":733.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-176","text_snippet":"808","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-177","text_snippet":"733","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":808,"prior_value":733.0},{"tag":"pgr:EquitySecuritiesCommonEquitiesCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Common equities, cost","current_period_value":808,"prior_period_value":733.5,"visual_current_value":808,"visual_prior_value":733.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-176","text_snippet":"808","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-180","text_snippet":"733.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":808,"prior_value":733.5},{"tag":"pgr:EquitySecuritiesNonredeemablePreferredStockCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Nonredeemable preferred stocks, cost","current_period_value":454,"prior_period_value":760.0,"visual_current_value":454,"visual_prior_value":760.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-170","text_snippet":"454","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-171","text_snippet":"760","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":454,"prior_value":760.0},{"tag":"pgr:EquitySecuritiesNonredeemablePreferredStockCost","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Nonredeemable preferred stocks, cost","current_period_value":454,"prior_period_value":759.7,"visual_current_value":454,"visual_prior_value":759.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-170","text_snippet":"454","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-174","text_snippet":"759.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":454,"prior_value":759.7},{"tag":"us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment","current_period_value":1398,"prior_period_value":1590.0,"visual_current_value":1398,"visual_prior_value":1590.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-215","text_snippet":"1,398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-216","text_snippet":"1,590","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1398,"prior_value":1590.0},{"tag":"us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment","current_period_value":1398,"prior_period_value":1589.7,"visual_current_value":1398,"visual_prior_value":1589.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-215","text_snippet":"1,398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-219","text_snippet":"1,589.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1398,"prior_value":1589.7},{"tag":"us-gaap:CommonStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Shares Authorized","current_period_value":900,"prior_period_value":900.0,"visual_current_value":900,"visual_prior_value":900.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-250","text_snippet":"900","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-249","text_snippet":"900","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":900,"prior_value":900.0},{"tag":"us-gaap:CommonStockSharesIssued","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Shares, Issued","current_period_value":798,"prior_period_value":798.0,"visual_current_value":798,"visual_prior_value":798.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-253","text_snippet":"798","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-251","text_snippet":"798","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":798,"prior_value":798.0},{"tag":"us-gaap:CommonStockSharesIssued","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Shares, Issued","current_period_value":798,"prior_period_value":797.6,"visual_current_value":798,"visual_prior_value":797.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-253","text_snippet":"798","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-276","text_snippet":"797.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":798,"prior_value":797.6},{"tag":"us-gaap:TreasuryStockCommonShares","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Common, Shares","current_period_value":212,"prior_period_value":212.0,"visual_current_value":212,"visual_prior_value":212.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-255","text_snippet":"212","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-254","text_snippet":"212","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":212,"prior_value":212.0},{"tag":"us-gaap:TreasuryStockCommonShares","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Common, Shares","current_period_value":212,"prior_period_value":211.8,"visual_current_value":212,"visual_prior_value":211.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-255","text_snippet":"212","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-277","text_snippet":"211.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":212,"prior_value":211.8},{"tag":"us-gaap:CommonStockParOrStatedValuePerShare","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical|consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Par or Stated Value Per Share","current_period_value":1,"prior_period_value":1.0,"visual_current_value":1,"visual_prior_value":1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-246","text_snippet":"1.00","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-245","text_snippet":"1.00","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":1,"prior_value":1.0},{"tag":"us-gaap:CommonStockParOrStatedValuePerShare","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheetsparenthetical|consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedbalancesheetsparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Par or Stated Value Per Share","current_period_value":1,"prior_period_value":null,"visual_current_value":1,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-246","text_snippet":"1.00","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"units","current_value":1,"prior_value":null},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:StatementOfCashFlowsAbstract","order":5.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Assets","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation","current_period_value":185,"prior_period_value":147.0,"visual_current_value":185,"visual_prior_value":147.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-194","text_snippet":"185","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-195","text_snippet":"147","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":185,"prior_value":147.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":35445,"prior_period_value":27159.0,"visual_current_value":35445,"visual_prior_value":27159.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-278","text_snippet":"35,445","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-279","text_snippet":"27,159","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":35445,"prior_value":27159.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":-13,"prior_period_value":-14.0,"visual_current_value":-13,"visual_prior_value":-14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-557","char_anchor":"f-2147","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-566","char_anchor":"f-2189","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-13,"prior_value":-14.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":203,"prior_period_value":-140.0,"visual_current_value":203,"visual_prior_value":-140.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-556","char_anchor":"f-2146","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-565","char_anchor":"f-2188","text_snippet":"140","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":203,"prior_value":-140.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":189,"prior_period_value":-155.0,"visual_current_value":189,"visual_prior_value":-155.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedOtherComprehensiveIncomeMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedOtherComprehensiveIncomeMember","member_label":"Accumulated Other Comprehensive Income"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-57","char_anchor":"f-386","text_snippet":"189","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-58","char_anchor":"f-387","text_snippet":"155","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":189,"prior_value":-155.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":-1,"prior_period_value":-1.0,"visual_current_value":-1,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-558","char_anchor":"f-2148","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-567","char_anchor":"f-2190","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":2233,"prior_period_value":2096.0,"visual_current_value":2233,"visual_prior_value":2096.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-37","char_anchor":"f-334","text_snippet":"2,233","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-38","char_anchor":"f-335","text_snippet":"2,096","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2233,"prior_value":2096.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":586,"prior_period_value":586.0,"visual_current_value":586,"visual_prior_value":586.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-27","char_anchor":"f-310","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-28","char_anchor":"f-311","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":586,"prior_value":586.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:PreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:PreferredStockMember","member_label":"Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-17","char_anchor":"f-292","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-18","char_anchor":"f-293","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":32437,"prior_period_value":24632.0,"visual_current_value":32437,"visual_prior_value":24632.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-47","char_anchor":"f-374","text_snippet":"32,437","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-48","char_anchor":"f-375","text_snippet":"24,632","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32437,"prior_value":24632.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":35445,"prior_period_value":null,"visual_current_value":35445,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-278","text_snippet":"35,445","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":0,"scale":"millions","current_value":35445,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":0,"prior_period_value":null,"visual_current_value":0,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:PreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:PreferredStockMember","member_label":"Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-17","char_anchor":"f-292","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":586,"prior_period_value":null,"visual_current_value":586,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-27","char_anchor":"f-310","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":586,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":2233,"prior_period_value":null,"visual_current_value":2233,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-37","char_anchor":"f-334","text_snippet":"2,233","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":2233,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":32437,"prior_period_value":null,"visual_current_value":32437,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-47","char_anchor":"f-374","text_snippet":"32,437","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":32437,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":189,"prior_period_value":null,"visual_current_value":189,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedOtherComprehensiveIncomeMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedOtherComprehensiveIncomeMember","member_label":"Accumulated Other Comprehensive Income"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-57","char_anchor":"f-386","text_snippet":"189","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":189,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":203,"prior_period_value":null,"visual_current_value":203,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-556","char_anchor":"f-2146","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":203,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":-13,"prior_period_value":null,"visual_current_value":-13,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-557","char_anchor":"f-2147","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-13,"prior_value":null},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|consolidatedstatementsofchangesinshareholdersequity|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null},{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Equity, Attributable to Parent","current_period_value":-1,"prior_period_value":null,"visual_current_value":-1,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-558","char_anchor":"f-2148","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:DebtLongtermAndShorttermCombinedAmount","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|debtsummaryofdebtdetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":4.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Debt, Long-Term and Short-Term, Combined Amount","current_period_value":6896,"prior_period_value":6892.0,"visual_current_value":6896,"visual_prior_value":6892.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-239","text_snippet":"6,896","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-240","text_snippet":"6,892","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6896,"prior_value":6892.0},{"tag":"us-gaap:DebtLongtermAndShorttermCombinedAmount","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|debtsummaryofdebtdetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":4.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Debt, Long-Term and Short-Term, Combined Amount","current_period_value":6896,"prior_period_value":6891.8,"visual_current_value":6896,"visual_prior_value":6891.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-239","text_snippet":"6,896","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-243","text_snippet":"6,891.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6896,"prior_value":6891.8},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":90024,"prior_period_value":75168.0,"visual_current_value":90024,"visual_prior_value":75168.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-167","text_snippet":"90,024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-168","text_snippet":"75,168","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":90024,"prior_value":75168.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-225","char_anchor":"f-1227","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-292","char_anchor":"f-1312","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-220","char_anchor":"f-1222","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-287","char_anchor":"f-1307","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-215","char_anchor":"f-1217","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-282","char_anchor":"f-1302","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6376,"prior_period_value":6614.0,"visual_current_value":6376,"visual_prior_value":6614.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-226","char_anchor":"f-1228","text_snippet":"6,376","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-293","char_anchor":"f-1313","text_snippet":"6,614","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6376,"prior_value":6614.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5686,"prior_period_value":4291.0,"visual_current_value":5686,"visual_prior_value":4291.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-221","char_anchor":"f-1223","text_snippet":"5,686","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-288","char_anchor":"f-1308","text_snippet":"4,291","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5686,"prior_value":4291.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3000,"prior_period_value":1424.0,"visual_current_value":3000,"visual_prior_value":1424.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-216","char_anchor":"f-1218","text_snippet":"3,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-283","char_anchor":"f-1303","text_snippet":"1,424","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3000,"prior_value":1424.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-227","char_anchor":"f-1229","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-294","char_anchor":"f-1314","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-222","char_anchor":"f-1224","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-289","char_anchor":"f-1309","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-217","char_anchor":"f-1219","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-284","char_anchor":"f-1304","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6374,"prior_period_value":6628.0,"visual_current_value":6374,"visual_prior_value":6628.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-229","char_anchor":"f-1231","text_snippet":"6,374","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-296","char_anchor":"f-1316","text_snippet":"6,628","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6374,"prior_value":6628.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5916,"prior_period_value":4664.0,"visual_current_value":5916,"visual_prior_value":4664.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-224","char_anchor":"f-1226","text_snippet":"5,916","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-291","char_anchor":"f-1311","text_snippet":"4,664","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5916,"prior_value":4664.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":2979,"prior_period_value":1404.0,"visual_current_value":2979,"visual_prior_value":1404.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-219","char_anchor":"f-1221","text_snippet":"2,979","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-286","char_anchor":"f-1306","text_snippet":"1,404","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2979,"prior_value":1404.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6376,"prior_period_value":6614.0,"visual_current_value":6376,"visual_prior_value":6614.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-228","char_anchor":"f-1230","text_snippet":"6,376","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-295","char_anchor":"f-1315","text_snippet":"6,614","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6376,"prior_value":6614.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5686,"prior_period_value":4291.0,"visual_current_value":5686,"visual_prior_value":4291.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-223","char_anchor":"f-1225","text_snippet":"5,686","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-290","char_anchor":"f-1310","text_snippet":"4,291","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5686,"prior_value":4291.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3000,"prior_period_value":1424.0,"visual_current_value":3000,"visual_prior_value":1424.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-218","char_anchor":"f-1220","text_snippet":"3,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-285","char_anchor":"f-1305","text_snippet":"1,424","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3000,"prior_value":1424.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-210","char_anchor":"f-1212","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-277","char_anchor":"f-1297","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-205","char_anchor":"f-1207","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-272","char_anchor":"f-1292","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44429.0,"visual_current_value":51339,"visual_prior_value":44429.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-195","char_anchor":"f-1197","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-262","char_anchor":"f-1282","text_snippet":"44,429","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44429.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-200","char_anchor":"f-1202","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-267","char_anchor":"f-1287","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18812,"prior_period_value":15033.0,"visual_current_value":18812,"visual_prior_value":15033.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-211","char_anchor":"f-1213","text_snippet":"18,812","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-278","char_anchor":"f-1298","text_snippet":"15,033","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18812,"prior_value":15033.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.0,"visual_current_value":16,"visual_prior_value":16.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-206","char_anchor":"f-1208","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-273","char_anchor":"f-1293","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-196","char_anchor":"f-1198","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-263","char_anchor":"f-1283","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3275,"prior_period_value":2601.0,"visual_current_value":3275,"visual_prior_value":2601.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-201","char_anchor":"f-1203","text_snippet":"3,275","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-268","char_anchor":"f-1288","text_snippet":"2,601","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3275,"prior_value":2601.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5,"prior_period_value":3.0,"visual_current_value":5,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-212","char_anchor":"f-1214","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-279","char_anchor":"f-1299","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":3.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-207","char_anchor":"f-1209","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-274","char_anchor":"f-1294","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-197","char_anchor":"f-1199","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-264","char_anchor":"f-1284","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-202","char_anchor":"f-1204","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-269","char_anchor":"f-1289","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18621,"prior_period_value":14970.0,"visual_current_value":18621,"visual_prior_value":14970.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-214","char_anchor":"f-1216","text_snippet":"18,621","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-281","char_anchor":"f-1301","text_snippet":"14,970","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18621,"prior_value":14970.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":17.0,"visual_current_value":16,"visual_prior_value":17.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-209","char_anchor":"f-1211","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-276","char_anchor":"f-1296","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":17.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51021,"prior_period_value":44231.0,"visual_current_value":51021,"visual_prior_value":44231.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-199","char_anchor":"f-1201","text_snippet":"51,021","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-266","char_anchor":"f-1286","text_snippet":"44,231","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51021,"prior_value":44231.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3320,"prior_period_value":2681.0,"visual_current_value":3320,"visual_prior_value":2681.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-204","char_anchor":"f-1206","text_snippet":"3,320","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-271","char_anchor":"f-1291","text_snippet":"2,681","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":3320,"prior_value":2681.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18817,"prior_period_value":15036.0,"visual_current_value":18817,"visual_prior_value":15036.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-213","char_anchor":"f-1215","text_snippet":"18,817","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-280","char_anchor":"f-1300","text_snippet":"15,036","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18817,"prior_value":15036.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.0,"visual_current_value":16,"visual_prior_value":16.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-208","char_anchor":"f-1210","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-275","char_anchor":"f-1295","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44429.0,"visual_current_value":51339,"visual_prior_value":44429.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-198","char_anchor":"f-1200","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-265","char_anchor":"f-1285","text_snippet":"44,429","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44429.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3275,"prior_period_value":2601.0,"visual_current_value":3275,"visual_prior_value":2601.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-203","char_anchor":"f-1205","text_snippet":"3,275","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-270","char_anchor":"f-1290","text_snippet":"2,601","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3275,"prior_value":2601.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":52753,"prior_period_value":45184.0,"visual_current_value":52753,"visual_prior_value":45184.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1242","text_snippet":"52,753","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-305","char_anchor":"f-1327","text_snippet":"45,184","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":52753,"prior_value":45184.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44429.0,"visual_current_value":51339,"visual_prior_value":44429.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-230","char_anchor":"f-1232","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-297","char_anchor":"f-1317","text_snippet":"44,429","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44429.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":1414,"prior_period_value":755.0,"visual_current_value":1414,"visual_prior_value":755.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-234","char_anchor":"f-1237","text_snippet":"1,414","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-301","char_anchor":"f-1322","text_snippet":"755","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1414,"prior_value":755.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":37266,"prior_period_value":29981.0,"visual_current_value":37266,"visual_prior_value":29981.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1243","text_snippet":"37,266","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-306","char_anchor":"f-1328","text_snippet":"29,981","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37266,"prior_value":29981.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":37165,"prior_period_value":29979.0,"visual_current_value":37165,"visual_prior_value":29979.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-231","char_anchor":"f-1233","text_snippet":"37,165","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-298","char_anchor":"f-1318","text_snippet":"29,979","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37165,"prior_value":29979.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":101,"prior_period_value":2.0,"visual_current_value":101,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-235","char_anchor":"f-1238","text_snippet":"101","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-302","char_anchor":"f-1323","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":101,"prior_value":2.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5,"prior_period_value":3.0,"visual_current_value":5,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1244","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-307","char_anchor":"f-1329","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":3.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5,"prior_period_value":3.0,"visual_current_value":5,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-232","char_anchor":"f-1234","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-299","char_anchor":"f-1319","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":3.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-236","char_anchor":"f-1239","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-303","char_anchor":"f-1324","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":89762,"prior_period_value":75352.0,"visual_current_value":89762,"visual_prior_value":75352.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1246","text_snippet":"89,762","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-308","char_anchor":"f-1331","text_snippet":"75,352","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":89762,"prior_value":75352.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":88247,"prior_period_value":74595.0,"visual_current_value":88247,"visual_prior_value":74595.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-233","char_anchor":"f-1236","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-300","char_anchor":"f-1321","text_snippet":"74,595","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":1515,"prior_period_value":757.0,"visual_current_value":1515,"visual_prior_value":757.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-237","char_anchor":"f-1241","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-304","char_anchor":"f-1326","text_snippet":"757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":757.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6376,"prior_period_value":6614.0,"visual_current_value":6376,"visual_prior_value":6614.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-536","text_snippet":"6,376","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-83","char_anchor":"f-620","text_snippet":"6,614","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6376,"prior_value":6614.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5686,"prior_period_value":4291.0,"visual_current_value":5686,"visual_prior_value":4291.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-530","text_snippet":"5,686","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-82","char_anchor":"f-614","text_snippet":"4,291","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5686,"prior_value":4291.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18817,"prior_period_value":15036.0,"visual_current_value":18817,"visual_prior_value":15036.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-518","text_snippet":"18,817","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-602","text_snippet":"15,036","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18817,"prior_value":15036.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.0,"visual_current_value":16,"visual_prior_value":16.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-512","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-596","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3000,"prior_period_value":1424.0,"visual_current_value":3000,"visual_prior_value":1424.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-524","text_snippet":"3,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-81","char_anchor":"f-608","text_snippet":"1,424","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3000,"prior_value":1424.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44429.0,"visual_current_value":51339,"visual_prior_value":44429.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-500","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-584","text_snippet":"44,429","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44429.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3275,"prior_period_value":2601.0,"visual_current_value":3275,"visual_prior_value":2601.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-506","text_snippet":"3,275","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-590","text_snippet":"2,601","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3275,"prior_value":2601.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":88509,"prior_period_value":74411.0,"visual_current_value":88509,"visual_prior_value":74411.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-542","text_snippet":"88,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-84","char_anchor":"f-626","text_snippet":"74,411","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88509,"prior_value":74411.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":1515,"prior_period_value":757.0,"visual_current_value":1515,"visual_prior_value":757.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-548","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-85","char_anchor":"f-632","text_snippet":"757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":757.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":90024,"prior_period_value":75167.7,"visual_current_value":90024,"visual_prior_value":75167.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-167","text_snippet":"90,024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-171","text_snippet":"75,167.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":90024,"prior_value":75167.7},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6376,"prior_period_value":6613.9,"visual_current_value":6376,"visual_prior_value":6613.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-226","char_anchor":"f-1228","text_snippet":"6,376","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-249","char_anchor":"f-1318","text_snippet":"6,613.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6376,"prior_value":6613.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5686,"prior_period_value":4291.6,"visual_current_value":5686,"visual_prior_value":4291.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-221","char_anchor":"f-1223","text_snippet":"5,686","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-244","char_anchor":"f-1313","text_snippet":"4,291.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5686,"prior_value":4291.6},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3000,"prior_period_value":1423.9,"visual_current_value":3000,"visual_prior_value":1423.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-216","char_anchor":"f-1218","text_snippet":"3,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-239","char_anchor":"f-1308","text_snippet":"1,423.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3000,"prior_value":1423.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6374,"prior_period_value":6628.3,"visual_current_value":6374,"visual_prior_value":6628.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-229","char_anchor":"f-1231","text_snippet":"6,374","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-252","char_anchor":"f-1321","text_snippet":"6,628.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6374,"prior_value":6628.3},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5916,"prior_period_value":4664.4,"visual_current_value":5916,"visual_prior_value":4664.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-224","char_anchor":"f-1226","text_snippet":"5,916","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-247","char_anchor":"f-1316","text_snippet":"4,664.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5916,"prior_value":4664.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":2979,"prior_period_value":1403.5,"visual_current_value":2979,"visual_prior_value":1403.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-219","char_anchor":"f-1221","text_snippet":"2,979","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-242","char_anchor":"f-1311","text_snippet":"1,403.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2979,"prior_value":1403.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6376,"prior_period_value":6613.9,"visual_current_value":6376,"visual_prior_value":6613.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-228","char_anchor":"f-1230","text_snippet":"6,376","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-251","char_anchor":"f-1320","text_snippet":"6,613.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6376,"prior_value":6613.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5686,"prior_period_value":4291.6,"visual_current_value":5686,"visual_prior_value":4291.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-223","char_anchor":"f-1225","text_snippet":"5,686","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-246","char_anchor":"f-1315","text_snippet":"4,291.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5686,"prior_value":4291.6},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3000,"prior_period_value":1423.9,"visual_current_value":3000,"visual_prior_value":1423.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:AssetBackedSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:AssetBackedSecuritiesMember","member_label":"Asset Backed Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-218","char_anchor":"f-1220","text_snippet":"3,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-241","char_anchor":"f-1310","text_snippet":"1,423.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3000,"prior_value":1423.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44428.5,"visual_current_value":51339,"visual_prior_value":44428.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-195","char_anchor":"f-1197","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-213","char_anchor":"f-1282","text_snippet":"44,428.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44428.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18812,"prior_period_value":15032.5,"visual_current_value":18812,"visual_prior_value":15032.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-211","char_anchor":"f-1213","text_snippet":"18,812","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-229","char_anchor":"f-1298","text_snippet":"15,032.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18812,"prior_value":15032.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.4,"visual_current_value":16,"visual_prior_value":16.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-206","char_anchor":"f-1208","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-224","char_anchor":"f-1293","text_snippet":"16.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3275,"prior_period_value":2601.4,"visual_current_value":3275,"visual_prior_value":2601.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-201","char_anchor":"f-1203","text_snippet":"3,275","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-219","char_anchor":"f-1288","text_snippet":"2,601.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3275,"prior_value":2601.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18621,"prior_period_value":14969.8,"visual_current_value":18621,"visual_prior_value":14969.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-214","char_anchor":"f-1216","text_snippet":"18,621","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-232","char_anchor":"f-1301","text_snippet":"14,969.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18621,"prior_value":14969.8},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.9,"visual_current_value":16,"visual_prior_value":16.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-209","char_anchor":"f-1211","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-227","char_anchor":"f-1296","text_snippet":"16.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51021,"prior_period_value":44231.3,"visual_current_value":51021,"visual_prior_value":44231.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-199","char_anchor":"f-1201","text_snippet":"51,021","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-217","char_anchor":"f-1286","text_snippet":"44,231.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51021,"prior_value":44231.3},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18817,"prior_period_value":15035.5,"visual_current_value":18817,"visual_prior_value":15035.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-213","char_anchor":"f-1215","text_snippet":"18,817","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-231","char_anchor":"f-1300","text_snippet":"15,035.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18817,"prior_value":15035.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.4,"visual_current_value":16,"visual_prior_value":16.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-208","char_anchor":"f-1210","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-226","char_anchor":"f-1295","text_snippet":"16.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44428.5,"visual_current_value":51339,"visual_prior_value":44428.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-198","char_anchor":"f-1200","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-216","char_anchor":"f-1285","text_snippet":"44,428.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44428.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3275,"prior_period_value":2601.4,"visual_current_value":3275,"visual_prior_value":2601.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:DebtSecuritiesMember|us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:DebtSecuritiesMember","member_label":"Debt Securities"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-203","char_anchor":"f-1205","text_snippet":"3,275","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-221","char_anchor":"f-1290","text_snippet":"2,601.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3275,"prior_value":2601.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":52753,"prior_period_value":45183.3,"visual_current_value":52753,"visual_prior_value":45183.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1242","text_snippet":"52,753","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-266","char_anchor":"f-1337","text_snippet":"45,183.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":52753,"prior_value":45183.3},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44428.5,"visual_current_value":51339,"visual_prior_value":44428.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-230","char_anchor":"f-1232","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-258","char_anchor":"f-1327","text_snippet":"44,428.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44428.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":1414,"prior_period_value":754.8,"visual_current_value":1414,"visual_prior_value":754.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-234","char_anchor":"f-1237","text_snippet":"1,414","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-262","char_anchor":"f-1332","text_snippet":"754.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1414,"prior_value":754.8},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":37266,"prior_period_value":29981.4,"visual_current_value":37266,"visual_prior_value":29981.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1243","text_snippet":"37,266","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-267","char_anchor":"f-1338","text_snippet":"29,981.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37266,"prior_value":29981.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":37165,"prior_period_value":29979.7,"visual_current_value":37165,"visual_prior_value":29979.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-231","char_anchor":"f-1233","text_snippet":"37,165","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-259","char_anchor":"f-1328","text_snippet":"29,979.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37165,"prior_value":29979.7},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":101,"prior_period_value":1.7,"visual_current_value":101,"visual_prior_value":1.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-235","char_anchor":"f-1238","text_snippet":"101","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-263","char_anchor":"f-1333","text_snippet":"1.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":101,"prior_value":1.7},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":89762,"prior_period_value":75351.7,"visual_current_value":89762,"visual_prior_value":75351.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1246","text_snippet":"89,762","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-269","char_anchor":"f-1341","text_snippet":"75,351.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":89762,"prior_value":75351.7},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":88247,"prior_period_value":74595.2,"visual_current_value":88247,"visual_prior_value":74595.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-233","char_anchor":"f-1236","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-261","char_anchor":"f-1331","text_snippet":"74,595.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.2},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":1515,"prior_period_value":756.5,"visual_current_value":1515,"visual_prior_value":756.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-237","char_anchor":"f-1241","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-265","char_anchor":"f-1336","text_snippet":"756.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":756.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":6376,"prior_period_value":6613.9,"visual_current_value":6376,"visual_prior_value":6613.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-536","text_snippet":"6,376","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-76","char_anchor":"f-563","text_snippet":"6,613.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6376,"prior_value":6613.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":5686,"prior_period_value":4291.6,"visual_current_value":5686,"visual_prior_value":4291.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-530","text_snippet":"5,686","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-75","char_anchor":"f-557","text_snippet":"4,291.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5686,"prior_value":4291.6},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":18817,"prior_period_value":15035.5,"visual_current_value":18817,"visual_prior_value":15035.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-518","text_snippet":"18,817","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-73","char_anchor":"f-545","text_snippet":"15,035.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18817,"prior_value":15035.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":16,"prior_period_value":16.4,"visual_current_value":16,"visual_prior_value":16.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-512","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-72","char_anchor":"f-539","text_snippet":"16.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3000,"prior_period_value":1423.9,"visual_current_value":3000,"visual_prior_value":1423.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-524","text_snippet":"3,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-74","char_anchor":"f-551","text_snippet":"1,423.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3000,"prior_value":1423.9},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":51339,"prior_period_value":44428.5,"visual_current_value":51339,"visual_prior_value":44428.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-500","text_snippet":"51,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-70","char_anchor":"f-527","text_snippet":"44,428.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51339,"prior_value":44428.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":3275,"prior_period_value":2601.4,"visual_current_value":3275,"visual_prior_value":2601.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-506","text_snippet":"3,275","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-71","char_anchor":"f-533","text_snippet":"2,601.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3275,"prior_value":2601.4},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":88509,"prior_period_value":74411.2,"visual_current_value":88509,"visual_prior_value":74411.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-542","text_snippet":"88,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-569","text_snippet":"74,411.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88509,"prior_value":74411.2},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtSecurities","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":1.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale","current_period_value":1515,"prior_period_value":756.5,"visual_current_value":1515,"visual_prior_value":756.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-548","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-575","text_snippet":"756.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":756.5},{"tag":"us-gaap:EquitySecuritiesFvNi","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Current","current_period_value":4485,"prior_period_value":4232.0,"visual_current_value":4485,"visual_prior_value":4232.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-182","text_snippet":"4,485","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-183","text_snippet":"4,232","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4485,"prior_value":4232.0},{"tag":"us-gaap:EquitySecuritiesFvNi","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Current","current_period_value":4047,"prior_period_value":3497.0,"visual_current_value":4047,"visual_prior_value":3497.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-566","text_snippet":"4,047","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-87","char_anchor":"f-650","text_snippet":"3,497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4047,"prior_value":3497.0},{"tag":"us-gaap:EquitySecuritiesFvNi","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AssetsAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Investments","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Investments","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Current","current_period_value":438,"prior_period_value":735.0,"visual_current_value":438,"visual_prior_value":735.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-560","text_snippet":"438","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-644","text_snippet":"735","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":438,"prior_value":735.0},{"tag":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Liability for Claims and Claims Adjustment Expense","current_period_value":42105,"prior_period_value":38062.0,"visual_current_value":42105,"visual_prior_value":38062.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-233","text_snippet":"42,105","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-234","text_snippet":"38,062","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":42105,"prior_value":38062.0},{"tag":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:Liabilities","weight":1.0,"order":2.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Liability for Claims and Claims Adjustment Expense","current_period_value":42105,"prior_period_value":38061.5,"visual_current_value":42105,"visual_prior_value":38061.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-233","text_snippet":"42,105","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-237","text_snippet":"38,061.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":42105,"prior_value":38061.5},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,4.0,3,4.0,3],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","current_period_value":189,"prior_period_value":-155.0,"visual_current_value":189,"visual_prior_value":-155.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-275","text_snippet":"189","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-276","text_snippet":"155","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":189,"prior_value":-155.0},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"consolidatedbalancesheets|othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"consolidatedbalancesheets","parent":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,4.0,3,4.0,3],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"consolidatedbalancesheets","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"consolidatedbalancesheets","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"},{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","current_period_value":189,"prior_period_value":-154.4,"visual_current_value":189,"visual_prior_value":-154.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-275","text_snippet":"189","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-298","text_snippet":"154.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":189,"prior_value":-154.4},{"tag":"pgr:PaymentsforRepurchaseofCommonStockforRestrictedStockTaxLiabilities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Financing Activities"}],"concept_label":"Payments for Repurchase of Common Stock for Restricted Stock Tax Liabilities","current_period_value":92,"prior_period_value":121.0,"visual_current_value":-92,"visual_prior_value":-121.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-456","text_snippet":"92","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-457","text_snippet":"121","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-92,"prior_value":-121.0},{"tag":"pgr:PaymentsforRepurchaseofCommonStockforRestrictedStockTaxLiabilities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Financing Activities"}],"concept_label":"Payments for Repurchase of Common Stock for Restricted Stock Tax Liabilities","current_period_value":92,"prior_period_value":120.7,"visual_current_value":-92,"visual_prior_value":-120.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-456","text_snippet":"92","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-482","text_snippet":"120.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-92,"prior_value":-120.7},{"tag":"pgr:PaymentsforRepurchaseofCommonStockintheOpenMarket","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Financing Activities"}],"concept_label":"Payments for Repurchase of Common Stock in the Open Market","current_period_value":15,"prior_period_value":13.0,"visual_current_value":-15,"visual_prior_value":-13.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-458","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-459","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-15,"prior_value":-13.0},{"tag":"pgr:ProceedsFromMaturitiesPrepaymentsAndCallsOfEquitySecuritiesFVNI","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Investing Activities"}],"concept_label":"Equity securities","current_period_value":240,"prior_period_value":110.0,"visual_current_value":240,"visual_prior_value":110.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-442","text_snippet":"240","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-443","text_snippet":"110","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":240,"prior_value":110.0},{"tag":"pgr:ProceedsFromMaturitiesPrepaymentsAndCallsOfEquitySecuritiesFVNI","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Investing Activities"}],"concept_label":"Equity securities","current_period_value":240,"prior_period_value":110.2,"visual_current_value":240,"visual_prior_value":110.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-442","text_snippet":"240","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-464","text_snippet":"110.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":240,"prior_value":110.2},{"tag":"pgr:ProceedsFromPayablesToBrokerDealersInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":8.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Investing Activities"}],"concept_label":"Net change in unsettled security transactions","current_period_value":398,"prior_period_value":514.0,"visual_current_value":398,"visual_prior_value":514.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-446","text_snippet":"398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-447","text_snippet":"514","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":398,"prior_value":514.0},{"tag":"pgr:ProceedsFromPayablesToBrokerDealersInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":8.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Investing Activities"}],"concept_label":"Net change in unsettled security transactions","current_period_value":398,"prior_period_value":514.1,"visual_current_value":398,"visual_prior_value":514.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-446","text_snippet":"398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-468","text_snippet":"514.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":398,"prior_value":514.1},{"tag":"us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Operating Activities"}],"concept_label":"Accretion (Amortization) of Discounts and Premiums, Investments","current_period_value":81,"prior_period_value":24.0,"visual_current_value":-81,"visual_prior_value":-24.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-404","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-405","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-81,"prior_value":-24.0},{"tag":"us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Operating Activities"}],"concept_label":"Accretion (Amortization) of Discounts and Premiums, Investments","current_period_value":81,"prior_period_value":23.5,"visual_current_value":-81,"visual_prior_value":-23.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-404","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-426","text_snippet":"23.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-81,"prior_value":-23.5},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:StatementOfCashFlowsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation","current_period_value":31,"prior_period_value":47.0,"visual_current_value":31,"visual_prior_value":47.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-466","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-467","text_snippet":"47","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":31,"prior_value":47.0},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:StatementOfCashFlowsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation","current_period_value":31,"prior_period_value":47.4,"visual_current_value":31,"visual_prior_value":47.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-466","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-490","text_snippet":"47.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":31,"prior_value":47.4},{"tag":"us-gaap:Depreciation","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation","current_period_value":230,"prior_period_value":208.0,"visual_current_value":230,"visual_prior_value":208.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-402","text_snippet":"230","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-403","text_snippet":"208","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":230,"prior_value":208.0},{"tag":"us-gaap:Depreciation","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation","current_period_value":230,"prior_period_value":208.2,"visual_current_value":230,"visual_prior_value":208.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-402","text_snippet":"230","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-424","text_snippet":"208.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":230,"prior_value":208.2},{"tag":"us-gaap:GainLossOnSaleOfPropertyPlantEquipment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":6.0,"section_label":"Operating Activities"}],"concept_label":"Gain (Loss) on Disposition of Property Plant Equipment","current_period_value":-2,"prior_period_value":2.0,"visual_current_value":2,"visual_prior_value":-2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-410","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-411","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-2.0},{"tag":"us-gaap:GainLossOnSaleOfPropertyPlantEquipment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":6.0,"section_label":"Operating Activities"}],"concept_label":"Gain (Loss) on Disposition of Property Plant Equipment","current_period_value":-2,"prior_period_value":1.9,"visual_current_value":2,"visual_prior_value":-1.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-410","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-432","text_snippet":"1.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-1.9},{"tag":"us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,8.0,7],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":14.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":14.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Accounts Payable and Accrued Liabilities","current_period_value":2079,"prior_period_value":1601.0,"visual_current_value":2079,"visual_prior_value":1601.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-426","text_snippet":"2,079","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-427","text_snippet":"1,601","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2079,"prior_value":1601.0},{"tag":"us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,8.0,7],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":14.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":14.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Accounts Payable and Accrued Liabilities","current_period_value":2079,"prior_period_value":1600.3,"visual_current_value":2079,"visual_prior_value":1600.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-426","text_snippet":"2,079","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-448","text_snippet":"1,600.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2079,"prior_value":1600.3},{"tag":"us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":4.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,4.0,3],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":10.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":10.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Deferred Policy Acquisition Costs","current_period_value":203,"prior_period_value":345.0,"visual_current_value":-203,"visual_prior_value":-345.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-418","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-419","text_snippet":"345","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-203,"prior_value":-345.0},{"tag":"us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":4.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,4.0,3],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":10.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":10.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Deferred Policy Acquisition Costs","current_period_value":203,"prior_period_value":344.2,"visual_current_value":-203,"visual_prior_value":-344.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-418","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-440","text_snippet":"344.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-203,"prior_value":-344.2},{"tag":"us-gaap:IncreaseDecreaseInIncomeTaxes","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,5.0,4],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":11.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":11.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Income Taxes","current_period_value":-138,"prior_period_value":-367.0,"visual_current_value":-138,"visual_prior_value":-367.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-420","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-421","text_snippet":"367","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-138,"prior_value":-367.0},{"tag":"us-gaap:IncreaseDecreaseInIncomeTaxes","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,5.0,4],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":11.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":11.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Income Taxes","current_period_value":-138,"prior_period_value":-366.8,"visual_current_value":-138,"visual_prior_value":-366.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-420","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-442","text_snippet":"366.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-138,"prior_value":-366.8},{"tag":"us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,7.0,6],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":13.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":13.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve","current_period_value":3048,"prior_period_value":3673.0,"visual_current_value":3048,"visual_prior_value":3673.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-424","text_snippet":"3,048","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-425","text_snippet":"3,673","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3048,"prior_value":3673.0},{"tag":"us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,7.0,6],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":13.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":13.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve","current_period_value":3048,"prior_period_value":3672.3,"visual_current_value":3048,"visual_prior_value":3672.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-424","text_snippet":"3,048","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-446","text_snippet":"3,672.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3048,"prior_value":3672.3},{"tag":"us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":9.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,9.0,8],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":15.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":15.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Other Operating Assets and Liabilities, Net","current_period_value":142,"prior_period_value":226.0,"visual_current_value":-142,"visual_prior_value":-226.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-428","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-429","text_snippet":"226","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-142,"prior_value":-226.0},{"tag":"us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":9.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,9.0,8],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":15.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":15.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Other Operating Assets and Liabilities, Net","current_period_value":142,"prior_period_value":225.1,"visual_current_value":-142,"visual_prior_value":-225.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-428","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-450","text_snippet":"225.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-142,"prior_value":-225.1},{"tag":"us-gaap:IncreaseDecreaseInPremiumsReceivable","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,1.0,0],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":7.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Premiums Receivable","current_period_value":2150,"prior_period_value":3177.0,"visual_current_value":-2150,"visual_prior_value":-3177.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-412","text_snippet":"2,150","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-413","text_snippet":"3,177","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2150,"prior_value":-3177.0},{"tag":"us-gaap:IncreaseDecreaseInPremiumsReceivable","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,1.0,0],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":7.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Premiums Receivable","current_period_value":2150,"prior_period_value":3177.2,"visual_current_value":-2150,"visual_prior_value":-3177.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-412","text_snippet":"2,150","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-434","text_snippet":"3,177.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2150,"prior_value":-3177.2},{"tag":"us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,3.0,2],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":9.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":9.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Prepaid Reinsurance Premiums","current_period_value":-134,"prior_period_value":-26.0,"visual_current_value":134,"visual_prior_value":26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-416","text_snippet":"134","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-417","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":134,"prior_value":26.0},{"tag":"us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,3.0,2],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":9.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":9.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Prepaid Reinsurance Premiums","current_period_value":-134,"prior_period_value":-25.8,"visual_current_value":134,"visual_prior_value":25.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-416","text_snippet":"134","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-438","text_snippet":"25.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":134,"prior_value":25.8},{"tag":"us-gaap:IncreaseDecreaseInReinsuranceRecoverable","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,2.0,1],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":8.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":8.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Reinsurance Recoverable","current_period_value":-658,"prior_period_value":-213.0,"visual_current_value":658,"visual_prior_value":213.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-414","text_snippet":"658","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-415","text_snippet":"213","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":658,"prior_value":213.0},{"tag":"us-gaap:IncreaseDecreaseInReinsuranceRecoverable","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,2.0,1],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":8.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":8.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Reinsurance Recoverable","current_period_value":-658,"prior_period_value":-212.4,"visual_current_value":658,"visual_prior_value":212.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-414","text_snippet":"658","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-436","text_snippet":"212.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":658,"prior_value":212.4},{"tag":"us-gaap:IncreaseDecreaseInUnearnedPremiums","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,6.0,5],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":12.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":12.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Unearned Premiums","current_period_value":2964,"prior_period_value":4638.0,"visual_current_value":2964,"visual_prior_value":4638.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-422","text_snippet":"2,964","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-423","text_snippet":"4,638","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2964,"prior_value":4638.0},{"tag":"us-gaap:IncreaseDecreaseInUnearnedPremiums","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5,6.0,5],"section_concept":"us-gaap:IncreaseDecreaseInOperatingCapitalAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":12.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":12.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Unearned Premiums","current_period_value":2964,"prior_period_value":4638.8,"visual_current_value":2964,"visual_prior_value":4638.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-422","text_snippet":"2,964","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-444","text_snippet":"4,638.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2964,"prior_value":4638.8},{"tag":"us-gaap:NetCashProvidedByUsedInFinancingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,6.0,5],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Financing Activities"}],"concept_label":"Cash Provided by (Used in) Financing Activity, Including Discontinued Operation","current_period_value":-2919,"prior_period_value":-1257.0,"visual_current_value":-2919,"visual_prior_value":-1257.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-464","text_snippet":"2,919","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-465","text_snippet":"1,257","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2919,"prior_value":-1257.0},{"tag":"us-gaap:NetCashProvidedByUsedInFinancingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,6.0,5],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Financing Activities"}],"concept_label":"Cash Provided by (Used in) Financing Activity, Including Discontinued Operation","current_period_value":-2919,"prior_period_value":-1256.7,"visual_current_value":-2919,"visual_prior_value":-1256.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-464","text_snippet":"2,919","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-488","text_snippet":"1,256.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2919,"prior_value":-1256.7},{"tag":"us-gaap:NetCashProvidedByUsedInInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,8.0,7],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Investing Activities"}],"concept_label":"Cash Provided by (Used in) Investing Activity, Including Discontinued Operation","current_period_value":-11428,"prior_period_value":-10807.0,"visual_current_value":-11428,"visual_prior_value":-10807.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-452","text_snippet":"11,428","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-453","text_snippet":"10,807","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-11428,"prior_value":-10807.0},{"tag":"us-gaap:NetCashProvidedByUsedInInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,8.0,7],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Investing Activities"}],"concept_label":"Cash Provided by (Used in) Investing Activity, Including Discontinued Operation","current_period_value":-11428,"prior_period_value":-10807.6,"visual_current_value":-11428,"visual_prior_value":-10807.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-452","text_snippet":"11,428","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-474","text_snippet":"10,807.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-11428,"prior_value":-10807.6},{"tag":"us-gaap:NetCashProvidedByUsedInOperatingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Cash Provided by (Used in) Operating Activity, Including Discontinued Operation","current_period_value":14378,"prior_period_value":12111.0,"visual_current_value":14378,"visual_prior_value":12111.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-430","text_snippet":"14,378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-431","text_snippet":"12,111","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":14378,"prior_value":12111.0,"scope_status":"mixed_scope_warning","scope_warning":"Operating cash flow is reported as consolidated cash flow while the filing also discloses discontinued operations or wind-down activity (Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current). Do not divide this consolidated CFO by continuing-operations revenue without an adjustment.","scope_bridge_ids":["cash_flow_scope_bridge:operating_cash_flow:2025-Q3:direct_discontinued"]},{"tag":"us-gaap:NetCashProvidedByUsedInOperatingActivities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Cash Provided by (Used in) Operating Activity, Including Discontinued Operation","current_period_value":14378,"prior_period_value":12111.7,"visual_current_value":14378,"visual_prior_value":12111.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-430","text_snippet":"14,378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-452","text_snippet":"12,111.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":14378,"prior_value":12111.7,"scope_status":"mixed_scope_warning","scope_warning":"Operating cash flow is reported as consolidated cash flow while the filing also discloses discontinued operations or wind-down activity (Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current). Do not divide this consolidated CFO by continuing-operations revenue without an adjustment.","scope_bridge_ids":["cash_flow_scope_bridge:operating_cash_flow:2025-Q3:direct_discontinued"]},{"tag":"us-gaap:PaymentsForProceedsFromShortTermInvestments","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":4.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":7.0,"section_label":"Investing Activities"}],"concept_label":"Payments for (Proceeds from) Short-Term Investments","current_period_value":825,"prior_period_value":-1070.0,"visual_current_value":-825,"visual_prior_value":1070.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-444","text_snippet":"825","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-445","text_snippet":"1,070","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-825,"prior_value":1070.0},{"tag":"us-gaap:PaymentsForProceedsFromShortTermInvestments","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":4.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":7.0,"section_label":"Investing Activities"}],"concept_label":"Payments for (Proceeds from) Short-Term Investments","current_period_value":825,"prior_period_value":-1070.3,"visual_current_value":-825,"visual_prior_value":1070.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-444","text_snippet":"825","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-466","text_snippet":"1,070.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-825,"prior_value":1070.3},{"tag":"us-gaap:PaymentsForRepurchaseOfPreferredStockAndPreferenceStock","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":4.0,"section_label":"Financing Activities"}],"concept_label":"Payments for Repurchase of Preferred Stock and Preference Stock","current_period_value":0,"prior_period_value":500.0,"visual_current_value":0,"visual_prior_value":-500.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-460","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-461","text_snippet":"500","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-500.0},{"tag":"us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:PaymentsToAcquireInvestmentsAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":1.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Debt Securities, Available-for-Sale","current_period_value":34912,"prior_period_value":35836.0,"visual_current_value":-34912,"visual_prior_value":-35836.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-432","text_snippet":"34,912","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-433","text_snippet":"35,836","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-34912,"prior_value":-35836.0},{"tag":"us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:PaymentsToAcquireInvestmentsAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":1.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Debt Securities, Available-for-Sale","current_period_value":34912,"prior_period_value":35835.5,"visual_current_value":-34912,"visual_prior_value":-35835.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-432","text_snippet":"34,912","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-454","text_snippet":"35,835.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-34912,"prior_value":-35835.5},{"tag":"us-gaap:PaymentsToAcquireEquitySecuritiesFvNi","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:PaymentsToAcquireInvestmentsAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,1.0,0,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Equity Securities, FV-NI","current_period_value":143,"prior_period_value":110.0,"visual_current_value":-143,"visual_prior_value":-110.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-434","text_snippet":"143","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-435","text_snippet":"110","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-143,"prior_value":-110.0},{"tag":"us-gaap:PaymentsToAcquireEquitySecuritiesFvNi","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:PaymentsToAcquireInvestmentsAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,1.0,0,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Equity Securities, FV-NI","current_period_value":143,"prior_period_value":110.6,"visual_current_value":-143,"visual_prior_value":-110.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-434","text_snippet":"143","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-456","text_snippet":"110.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-143,"prior_value":-110.6},{"tag":"us-gaap:PaymentsToAcquirePropertyPlantAndEquipment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":6.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,6.0,5],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":9.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":9.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Property, Plant, and Equipment","current_period_value":227,"prior_period_value":175.0,"visual_current_value":-227,"visual_prior_value":-175.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-448","text_snippet":"227","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-449","text_snippet":"175","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-227,"prior_value":-175.0},{"tag":"us-gaap:PaymentsToAcquirePropertyPlantAndEquipment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":6.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,6.0,5],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":9.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":9.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Property, Plant, and Equipment","current_period_value":227,"prior_period_value":174.8,"visual_current_value":-227,"visual_prior_value":-174.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-448","text_snippet":"227","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-470","text_snippet":"174.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-227,"prior_value":-174.8},{"tag":"us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale","current_period_value":6269,"prior_period_value":4750.0,"visual_current_value":6269,"visual_prior_value":4750.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-440","text_snippet":"6,269","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-441","text_snippet":"4,750","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6269,"prior_value":4750.0},{"tag":"us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale","current_period_value":6269,"prior_period_value":4749.8,"visual_current_value":6269,"visual_prior_value":4749.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-440","text_snippet":"6,269","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-462","text_snippet":"4,749.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6269,"prior_value":4749.8},{"tag":"us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Sale of Debt Securities, Available-for-Sale","current_period_value":17520,"prior_period_value":18583.0,"visual_current_value":17520,"visual_prior_value":18583.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-436","text_snippet":"17,520","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-437","text_snippet":"18,583","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17520,"prior_value":18583.0},{"tag":"us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Sale of Debt Securities, Available-for-Sale","current_period_value":17520,"prior_period_value":18582.5,"visual_current_value":17520,"visual_prior_value":18582.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-436","text_snippet":"17,520","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-458","text_snippet":"18,582.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17520,"prior_value":18582.5},{"tag":"us-gaap:ProceedsFromSaleOfEquitySecuritiesFvNi","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Sale of Equity Securities, FV-NI","current_period_value":182,"prior_period_value":222.0,"visual_current_value":182,"visual_prior_value":222.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-438","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-439","text_snippet":"222","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":182,"prior_value":222.0},{"tag":"us-gaap:ProceedsFromSaleOfEquitySecuritiesFvNi","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Sale of Equity Securities, FV-NI","current_period_value":182,"prior_period_value":221.9,"visual_current_value":182,"visual_prior_value":221.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-438","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-460","text_snippet":"221.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":182,"prior_value":221.9},{"tag":"us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,7.0,6],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":10.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":10.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Sale of Property, Plant, and Equipment","current_period_value":70,"prior_period_value":65.0,"visual_current_value":70,"visual_prior_value":65.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-450","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-451","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":70,"prior_value":65.0},{"tag":"us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,7.0,6],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":1.0,"order":10.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":1.0,"calculation_order":10.0,"section_label":"Investing Activities"}],"concept_label":"Proceeds from Sale of Property, Plant, and Equipment","current_period_value":70,"prior_period_value":64.5,"visual_current_value":70,"visual_prior_value":64.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-450","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-472","text_snippet":"64.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":70,"prior_value":64.5},{"tag":"us-gaap:RealizedInvestmentGainsLosses","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":4.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Operating Activities"}],"concept_label":"Realized Investment Gains (Losses)","current_period_value":470,"prior_period_value":317.0,"visual_current_value":-470,"visual_prior_value":-317.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-408","text_snippet":"470","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-409","text_snippet":"317","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-470,"prior_value":-317.0},{"tag":"us-gaap:RealizedInvestmentGainsLosses","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":4.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Operating Activities"}],"concept_label":"Realized Investment Gains (Losses)","current_period_value":470,"prior_period_value":316.7,"visual_current_value":-470,"visual_prior_value":-316.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-408","text_snippet":"470","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-430","text_snippet":"316.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-470,"prior_value":-316.7},{"tag":"us-gaap:RestrictedStockExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Activities"}],"concept_label":"Restricted Stock or Unit Expense","current_period_value":90,"prior_period_value":86.0,"visual_current_value":90,"visual_prior_value":86.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-406","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-407","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":90,"prior_value":86.0},{"tag":"us-gaap:RestrictedStockExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Activities"}],"concept_label":"Restricted Stock or Unit Expense","current_period_value":90,"prior_period_value":85.8,"visual_current_value":90,"visual_prior_value":85.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-406","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-428","text_snippet":"85.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":90,"prior_value":85.8},{"tag":"us-gaap:NetIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":1.0},{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":1.0,"order":1.0}],"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":2615,"prior_period_value":2334.0,"visual_current_value":2615,"visual_prior_value":2334.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-103","text_snippet":"2,615","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-104","text_snippet":"2,334","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2615,"prior_value":2334.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":1.0},{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":1.0,"order":1.0}],"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":2615,"prior_period_value":2334.0,"visual_current_value":2615,"visual_prior_value":2334.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-43","char_anchor":"f-342","text_snippet":"2,615","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-44","char_anchor":"f-343","text_snippet":"2,334","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2615,"prior_value":2334.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":1.0},{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":1.0,"order":1.0}],"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":8357,"prior_period_value":6124.0,"visual_current_value":8357,"visual_prior_value":6124.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-105","text_snippet":"8,357","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-106","text_snippet":"6,124","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8357,"prior_value":6124.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":1.0},{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":1.0,"order":1.0}],"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":8357,"prior_period_value":6124.0,"visual_current_value":8357,"visual_prior_value":6124.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-344","text_snippet":"8,357","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-46","char_anchor":"f-345","text_snippet":"6,124","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8357,"prior_value":6124.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":1.0},{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":1.0,"order":1.0}],"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":8357,"prior_period_value":6123.5,"visual_current_value":8357,"visual_prior_value":6123.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-105","text_snippet":"8,357","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-105","text_snippet":"6,123.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8357,"prior_value":6123.5},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":1.0},{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":1.0,"order":1.0}],"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null},{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":8357,"prior_period_value":6123.5,"visual_current_value":8357,"visual_prior_value":6123.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-344","text_snippet":"8,357","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-51","char_anchor":"f-368","text_snippet":"6,123.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8357,"prior_value":6123.5},{"tag":"us-gaap:PaymentsOfDividendsCommonStock","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":1.0,"section_label":"Financing Activities"},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Payments of Ordinary Dividends, Common Stock","current_period_value":2812,"prior_period_value":615.0,"visual_current_value":-2812,"visual_prior_value":-615.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-454","text_snippet":"2,812","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-455","text_snippet":"615","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2812,"prior_value":-615.0},{"tag":"us-gaap:PaymentsOfDividendsCommonStock","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":1.0,"section_label":"Financing Activities"},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Payments of Ordinary Dividends, Common Stock","current_period_value":2812,"prior_period_value":615.1,"visual_current_value":-2812,"visual_prior_value":-615.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-454","text_snippet":"2,812","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-478","text_snippet":"615.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2812,"prior_value":-615.1},{"tag":"us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Financing Activities"},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Payments of Ordinary Dividends, Preferred Stock and Preference Stock","current_period_value":0,"prior_period_value":8.0,"visual_current_value":0,"visual_prior_value":-8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-462","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-463","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-8.0},{"tag":"us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcashflows|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcashflows","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcashflows","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Financing Activities"},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Payments of Ordinary Dividends, Preferred Stock and Preference Stock","current_period_value":0,"prior_period_value":7.8,"visual_current_value":0,"visual_prior_value":-7.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-462","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-480","text_snippet":"7.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-7.8},{"tag":"pgr:PreferredStockRedemptionAmountExcludingDividendsAndUnderwritersFees","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Redemption Amount, Excluding Dividends and Underwriters Fees","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:PreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:PreferredStockMember","member_label":"Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-13","char_anchor":"f-288","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-14","char_anchor":"f-289","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"pgr:PreferredStockRedemptionAmountExcludingDividendsAndUnderwritersFees","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Redemption Amount, Excluding Dividends and Underwriters Fees","current_period_value":0,"prior_period_value":494.0,"visual_current_value":0,"visual_prior_value":-494.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:PreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:PreferredStockMember","member_label":"Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-15","char_anchor":"f-290","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-16","char_anchor":"f-291","text_snippet":"494","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-494.0},{"tag":"pgr:PreferredStockRedemptionAmountExcludingDividendsAndUnderwritersFees","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Redemption Amount, Excluding Dividends and Underwriters Fees","current_period_value":0,"prior_period_value":493.9,"visual_current_value":0,"visual_prior_value":-493.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:PreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:PreferredStockMember","member_label":"Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-15","char_anchor":"f-290","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-21","char_anchor":"f-314","text_snippet":"493.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-493.9},{"tag":"us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"APIC, Share-Based Payment Arrangement, Increase for Cost Recognition","current_period_value":42,"prior_period_value":38.0,"visual_current_value":42,"visual_prior_value":38.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-33","char_anchor":"f-318","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-34","char_anchor":"f-319","text_snippet":"38","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":42,"prior_value":38.0},{"tag":"us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"APIC, Share-Based Payment Arrangement, Increase for Cost Recognition","current_period_value":90,"prior_period_value":86.0,"visual_current_value":90,"visual_prior_value":86.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-320","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-36","char_anchor":"f-321","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":90,"prior_value":86.0},{"tag":"us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"APIC, Share-Based Payment Arrangement, Increase for Cost Recognition","current_period_value":90,"prior_period_value":85.8,"visual_current_value":90,"visual_prior_value":85.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-320","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-41","char_anchor":"f-344","text_snippet":"85.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":90,"prior_value":85.8},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Common Stock, Cash","current_period_value":59,"prior_period_value":59.0,"visual_current_value":-59,"visual_prior_value":-59.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-43","char_anchor":"f-354","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-44","char_anchor":"f-355","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-59,"prior_value":-59.0},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Common Stock, Cash","current_period_value":176,"prior_period_value":176.0,"visual_current_value":-176,"visual_prior_value":-176.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-356","text_snippet":"176","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-46","char_anchor":"f-357","text_snippet":"176","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-176,"prior_value":-176.0},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Common Stock, Cash","current_period_value":176,"prior_period_value":175.6,"visual_current_value":-176,"visual_prior_value":-175.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-356","text_snippet":"176","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-51","char_anchor":"f-380","text_snippet":"175.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-176,"prior_value":-175.6},{"tag":"us-gaap:DividendsPreferredStockCash","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":9.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Preferred Stock, Cash","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-43","char_anchor":"f-362","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-44","char_anchor":"f-363","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:DividendsPreferredStockCash","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":9.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Preferred Stock, Cash","current_period_value":0,"prior_period_value":8.0,"visual_current_value":0,"visual_prior_value":-8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-364","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-46","char_anchor":"f-365","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-8.0},{"tag":"us-gaap:DividendsPreferredStockCash","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":9.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Preferred Stock, Cash","current_period_value":0,"prior_period_value":7.8,"visual_current_value":0,"visual_prior_value":-7.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-364","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-51","char_anchor":"f-388","text_snippet":"7.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-7.8},{"tag":"us-gaap:DividendsShareBasedCompensation","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Dividend, Share-Based Payment Arrangement","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-33","char_anchor":"f-330","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-34","char_anchor":"f-331","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:DividendsShareBasedCompensation","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Dividend, Share-Based Payment Arrangement","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-43","char_anchor":"f-366","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-44","char_anchor":"f-367","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:DividendsShareBasedCompensation","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Dividend, Share-Based Payment Arrangement","current_period_value":0,"prior_period_value":-1.0,"visual_current_value":0,"visual_prior_value":1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-332","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-36","char_anchor":"f-333","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":1.0},{"tag":"us-gaap:DividendsShareBasedCompensation","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Dividend, Share-Based Payment Arrangement","current_period_value":0,"prior_period_value":1.0,"visual_current_value":0,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-368","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-46","char_anchor":"f-369","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-1.0},{"tag":"us-gaap:DividendsShareBasedCompensation","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Dividend, Share-Based Payment Arrangement","current_period_value":0,"prior_period_value":-0.8,"visual_current_value":0,"visual_prior_value":0.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-332","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-41","char_anchor":"f-356","text_snippet":"0.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.8},{"tag":"us-gaap:DividendsShareBasedCompensation","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Dividend, Share-Based Payment Arrangement","current_period_value":0,"prior_period_value":0.8,"visual_current_value":0,"visual_prior_value":-0.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-368","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-51","char_anchor":"f-392","text_snippet":"0.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.8},{"tag":"us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Stock Issued During Period, Value, Restricted Stock Award, Gross","current_period_value":-1,"prior_period_value":-1.0,"visual_current_value":-1,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-33","char_anchor":"f-326","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-34","char_anchor":"f-327","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Stock Issued During Period, Value, Restricted Stock Award, Gross","current_period_value":1,"prior_period_value":1.0,"visual_current_value":1,"visual_prior_value":1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-23","char_anchor":"f-306","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-24","char_anchor":"f-307","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Stock Issued During Period, Value, Restricted Stock Award, Gross","current_period_value":-1,"prior_period_value":-2.0,"visual_current_value":-1,"visual_prior_value":-2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-328","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-36","char_anchor":"f-329","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-2.0},{"tag":"us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Stock Issued During Period, Value, Restricted Stock Award, Gross","current_period_value":1,"prior_period_value":2.0,"visual_current_value":1,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-25","char_anchor":"f-308","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-26","char_anchor":"f-309","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":2.0},{"tag":"us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Stock Issued During Period, Value, Restricted Stock Award, Gross","current_period_value":-1,"prior_period_value":-1.2,"visual_current_value":-1,"visual_prior_value":-1.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-328","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-41","char_anchor":"f-352","text_snippet":"1.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.2},{"tag":"us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Stock Issued During Period, Value, Restricted Stock Award, Gross","current_period_value":1,"prior_period_value":1.2,"visual_current_value":1,"visual_prior_value":1.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-25","char_anchor":"f-308","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-31","char_anchor":"f-332","text_snippet":"1.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.2},{"tag":"us-gaap:StockholdersEquityOther","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":10.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Stockholders' Equity, Other","current_period_value":1,"prior_period_value":-31.0,"visual_current_value":-1,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-43","char_anchor":"f-370","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-44","char_anchor":"f-371","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":31.0},{"tag":"us-gaap:StockholdersEquityOther","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":10.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Stockholders' Equity, Other","current_period_value":-78,"prior_period_value":-23.0,"visual_current_value":78,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-372","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-46","char_anchor":"f-373","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":78,"prior_value":23.0},{"tag":"us-gaap:StockholdersEquityOther","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":10.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Stockholders' Equity, Other","current_period_value":-78,"prior_period_value":-22.7,"visual_current_value":78,"visual_prior_value":22.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-372","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-51","char_anchor":"f-396","text_snippet":"22.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":78,"prior_value":22.7},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":0,"prior_period_value":1.0,"visual_current_value":0,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-33","char_anchor":"f-322","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-34","char_anchor":"f-323","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-1.0},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":1,"prior_period_value":1.0,"visual_current_value":-1,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-23","char_anchor":"f-302","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-24","char_anchor":"f-303","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":39,"prior_period_value":84.0,"visual_current_value":-39,"visual_prior_value":-84.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-43","char_anchor":"f-346","text_snippet":"39","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-44","char_anchor":"f-347","text_snippet":"84","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-39,"prior_value":-84.0},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":1,"prior_period_value":2.0,"visual_current_value":-1,"visual_prior_value":-2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-324","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-36","char_anchor":"f-325","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-2.0},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":1,"prior_period_value":1.0,"visual_current_value":-1,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-25","char_anchor":"f-304","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-26","char_anchor":"f-305","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":105,"prior_period_value":131.0,"visual_current_value":-105,"visual_prior_value":-131.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-348","text_snippet":"105","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-46","char_anchor":"f-349","text_snippet":"131","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-105,"prior_value":-131.0},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":1,"prior_period_value":2.3,"visual_current_value":-1,"visual_prior_value":-2.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AdditionalPaidInCapitalMember","member_label":"Additional Paid In Capital"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-35","char_anchor":"f-324","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-41","char_anchor":"f-348","text_snippet":"2.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-2.3},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":1,"prior_period_value":0.7,"visual_current_value":-1,"visual_prior_value":-0.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-25","char_anchor":"f-304","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-31","char_anchor":"f-328","text_snippet":"0.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.7},{"tag":"us-gaap:TreasuryStockValueAcquiredCostMethod","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Treasury Stock, Value, Acquired, Cost Method","current_period_value":105,"prior_period_value":130.8,"visual_current_value":-105,"visual_prior_value":-130.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:RetainedEarningsMember","member_label":"Retained Earnings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-45","char_anchor":"f-348","text_snippet":"105","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-51","char_anchor":"f-372","text_snippet":"130.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-105,"prior_value":-130.8},{"tag":"us-gaap:PreferredStockDividendsPerShareDeclared","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Dividends Per Share, Declared","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-358","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-359","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":0,"prior_value":0.0},{"tag":"us-gaap:PreferredStockDividendsPerShareDeclared","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Dividends Per Share, Declared","current_period_value":0,"prior_period_value":15.688377,"visual_current_value":0,"visual_prior_value":15.688377,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-360","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-361","text_snippet":"15.688377","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":0,"prior_value":15.688377},{"tag":"us-gaap:PreferredStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Shares Authorized","current_period_value":5,"prior_period_value":5.0,"visual_current_value":5,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementClassOfStockAxis=pgr:VotingPreferredStockMember","dimensions":[{"axis":"us-gaap:StatementClassOfStockAxis","axis_label":"Statement Class Of Stock","member":"pgr:VotingPreferredStockMember","member_label":"Voting Preference Shares"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-61","char_anchor":"f-396","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-62","char_anchor":"f-397","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":5.0},{"tag":"us-gaap:PreferredStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Shares Authorized","current_period_value":20,"prior_period_value":20.0,"visual_current_value":20,"visual_prior_value":20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=pgr:SerialPreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"pgr:SerialPreferredStockMember","member_label":"Serial Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-60","char_anchor":"f-395","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-59","char_anchor":"f-394","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":20,"prior_value":20.0},{"tag":"us-gaap:PreferredStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Shares Authorized","current_period_value":20,"prior_period_value":null,"visual_current_value":20,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=pgr:SerialPreferredStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"pgr:SerialPreferredStockMember","member_label":"Serial Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-60","char_anchor":"f-395","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":20,"prior_value":null},{"tag":"us-gaap:PreferredStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Shares Authorized","current_period_value":5,"prior_period_value":null,"visual_current_value":5,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementClassOfStockAxis=pgr:VotingPreferredStockMember","dimensions":[{"axis":"us-gaap:StatementClassOfStockAxis","axis_label":"Statement Class Of Stock","member":"pgr:VotingPreferredStockMember","member_label":"Voting Preference Shares"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-61","char_anchor":"f-396","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":null},{"tag":"us-gaap:CommonStockDividendsPerShareDeclared","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Dividends, Per Share, Declared","current_period_value":0.1,"prior_period_value":0.1,"visual_current_value":0.1,"visual_prior_value":0.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-350","text_snippet":"0.10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-351","text_snippet":"0.10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":0.1,"prior_value":0.1},{"tag":"us-gaap:CommonStockDividendsPerShareDeclared","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Dividends, Per Share, Declared","current_period_value":0.3,"prior_period_value":0.3,"visual_current_value":0.3,"visual_prior_value":0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-352","text_snippet":"0.30","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-353","text_snippet":"0.30","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":0.3,"prior_value":0.3},{"tag":"us-gaap:CommonStockDividendsPerShareDeclared","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls|dividendsdetails","presentation_hierarchy":[{"role":"consolidatedstatementsofchangesinshareholdersequityparentheticalls","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Dividends, Per Share, Declared","current_period_value":0.1,"prior_period_value":null,"visual_current_value":0.1,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:DividendsAxis=pgr:O2025Q3DividendsMember","dimensions":[{"axis":"us-gaap:DividendsAxis","axis_label":"Dividends","member":"pgr:O2025Q3DividendsMember","member_label":"O2025Q3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-540","char_anchor":"f-2087","text_snippet":"0.10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"units","current_value":0.1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax","current_period_value":284,"prior_period_value":1561.0,"visual_current_value":284,"visual_prior_value":1561.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-115","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-116","text_snippet":"1,561","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":284,"prior_value":1561.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax","current_period_value":284,"prior_period_value":1561.0,"visual_current_value":284,"visual_prior_value":1561.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedOtherComprehensiveIncomeMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedOtherComprehensiveIncomeMember","member_label":"Accumulated Other Comprehensive Income"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-53","char_anchor":"f-382","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-54","char_anchor":"f-383","text_snippet":"1,561","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":284,"prior_value":1561.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax","current_period_value":1612,"prior_period_value":1461.0,"visual_current_value":1612,"visual_prior_value":1461.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-117","text_snippet":"1,612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-118","text_snippet":"1,461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1612,"prior_value":1461.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax","current_period_value":1612,"prior_period_value":1461.0,"visual_current_value":1612,"visual_prior_value":1461.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedOtherComprehensiveIncomeMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedOtherComprehensiveIncomeMember","member_label":"Accumulated Other Comprehensive Income"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-55","char_anchor":"f-384","text_snippet":"1,612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-56","char_anchor":"f-385","text_snippet":"1,461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1612,"prior_value":1461.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax","current_period_value":1612,"prior_period_value":1461.3,"visual_current_value":1612,"visual_prior_value":1461.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-117","text_snippet":"1,612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-121","text_snippet":"1,461.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1612,"prior_value":1461.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofchangesinshareholdersequity|consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"consolidatedstatementsofchangesinshareholdersequity","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax","current_period_value":1612,"prior_period_value":1461.3,"visual_current_value":1612,"visual_prior_value":1461.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedOtherComprehensiveIncomeMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedOtherComprehensiveIncomeMember","member_label":"Accumulated Other Comprehensive Income"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-55","char_anchor":"f-384","text_snippet":"1,612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-61","char_anchor":"f-408","text_snippet":"1,461.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1612,"prior_value":1461.3},{"tag":"pgr:NonInsuranceServiceExpenses","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Service expenses","current_period_value":144,"prior_period_value":126.0,"visual_current_value":144,"visual_prior_value":126.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-83","text_snippet":"144","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-84","text_snippet":"126","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":144,"prior_value":126.0},{"tag":"pgr:NonInsuranceServiceExpenses","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Service expenses","current_period_value":400,"prior_period_value":333.0,"visual_current_value":400,"visual_prior_value":333.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-85","text_snippet":"400","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-86","text_snippet":"333","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":400,"prior_value":333.0},{"tag":"pgr:NonInsuranceServiceExpenses","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":6.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Service expenses","current_period_value":400,"prior_period_value":333.1,"visual_current_value":400,"visual_prior_value":333.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-85","text_snippet":"400","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-85","text_snippet":"333.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":400,"prior_value":333.1},{"tag":"pgr:NonInsuranceServiceRevenues","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Service revenues","current_period_value":138,"prior_period_value":117.0,"visual_current_value":138,"visual_prior_value":117.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-55","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-56","text_snippet":"117","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":138,"prior_value":117.0},{"tag":"pgr:NonInsuranceServiceRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Service revenues","current_period_value":382,"prior_period_value":308.0,"visual_current_value":382,"visual_prior_value":308.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-57","text_snippet":"382","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-58","text_snippet":"308","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":382,"prior_value":308.0},{"tag":"pgr:NonInsuranceServiceRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Service revenues","current_period_value":382,"prior_period_value":307.8,"visual_current_value":382,"visual_prior_value":307.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-57","text_snippet":"382","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-61","text_snippet":"307.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":382,"prior_value":307.8},{"tag":"us-gaap:BenefitsLossesAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Benefits, Losses and Expenses","current_period_value":19189,"prior_period_value":16773.0,"visual_current_value":19189,"visual_prior_value":16773.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-91","text_snippet":"19,189","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-92","text_snippet":"16,773","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":19189,"prior_value":16773.0},{"tag":"us-gaap:BenefitsLossesAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Benefits, Losses and Expenses","current_period_value":54384,"prior_period_value":47350.0,"visual_current_value":54384,"visual_prior_value":47350.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-93","text_snippet":"54,384","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-94","text_snippet":"47,350","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":54384,"prior_value":47350.0},{"tag":"us-gaap:BenefitsLossesAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Benefits, Losses and Expenses","current_period_value":54384,"prior_period_value":47350.7,"visual_current_value":54384,"visual_prior_value":47350.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-93","text_snippet":"54,384","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-93","text_snippet":"47,350.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":54384,"prior_value":47350.7},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":2899,"prior_period_value":3895.0,"visual_current_value":2899,"visual_prior_value":3895.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-119","text_snippet":"2,899","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-120","text_snippet":"3,895","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2899,"prior_value":3895.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":9969,"prior_period_value":7585.0,"visual_current_value":9969,"visual_prior_value":7585.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-121","text_snippet":"9,969","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-122","text_snippet":"7,585","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9969,"prior_value":7585.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":9969,"prior_period_value":7584.8,"visual_current_value":9969,"visual_prior_value":7584.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-121","text_snippet":"9,969","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-125","text_snippet":"7,584.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9969,"prior_value":7584.8},{"tag":"us-gaap:DebtAndEquitySecuritiesRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gain (Loss)","current_period_value":12,"prior_period_value":68.0,"visual_current_value":12,"visual_prior_value":68.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-39","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-40","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":68.0},{"tag":"us-gaap:DebtAndEquitySecuritiesRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gain (Loss)","current_period_value":32,"prior_period_value":-305.0,"visual_current_value":32,"visual_prior_value":-305.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-41","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-42","text_snippet":"305","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32,"prior_value":-305.0},{"tag":"us-gaap:DebtAndEquitySecuritiesRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gain (Loss)","current_period_value":32,"prior_period_value":-304.9,"visual_current_value":32,"visual_prior_value":-304.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-41","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-41","text_snippet":"304.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32,"prior_value":-304.9},{"tag":"us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Deferred Policy Acquisition Costs, Amortization Expense","current_period_value":1555,"prior_period_value":1390.0,"visual_current_value":1555,"visual_prior_value":1390.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-67","text_snippet":"1,555","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-68","text_snippet":"1,390","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1555,"prior_value":1390.0},{"tag":"us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Deferred Policy Acquisition Costs, Amortization Expense","current_period_value":4522,"prior_period_value":3930.0,"visual_current_value":4522,"visual_prior_value":3930.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-69","text_snippet":"4,522","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-70","text_snippet":"3,930","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4522,"prior_value":3930.0},{"tag":"us-gaap:EarningsPerShareBasic","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,7.0,6],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Earnings Per Share, Basic","current_period_value":4.46,"prior_period_value":3.98,"visual_current_value":4.46,"visual_prior_value":3.98,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-147","text_snippet":"4.46","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-148","text_snippet":"3.98","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":4.46,"prior_value":3.98},{"tag":"us-gaap:EarningsPerShareBasic","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,7.0,6],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Earnings Per Share, Basic","current_period_value":14.25,"prior_period_value":10.43,"visual_current_value":14.25,"visual_prior_value":10.43,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-149","text_snippet":"14.25","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-150","text_snippet":"10.43","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":14.25,"prior_value":10.43},{"tag":"us-gaap:EarningsPerShareDiluted","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,8.0,7],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Earnings Per Share, Diluted","current_period_value":4.45,"prior_period_value":3.97,"visual_current_value":4.45,"visual_prior_value":3.97,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-151","text_snippet":"4.45","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-152","text_snippet":"3.97","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":4.45,"prior_value":3.97},{"tag":"us-gaap:EarningsPerShareDiluted","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,8.0,7],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Earnings Per Share, Diluted","current_period_value":14.21,"prior_period_value":10.39,"visual_current_value":14.21,"visual_prior_value":10.39,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-153","text_snippet":"14.21","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-154","text_snippet":"10.39","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":14.21,"prior_value":10.39},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":708,"prior_period_value":612.0,"visual_current_value":708,"visual_prior_value":612.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-99","text_snippet":"708","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-100","text_snippet":"612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":708,"prior_value":612.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":2184,"prior_period_value":1622.0,"visual_current_value":2184,"visual_prior_value":1622.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-101","text_snippet":"2,184","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-102","text_snippet":"1,622","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2184,"prior_value":1622.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":2184,"prior_period_value":1621.6,"visual_current_value":2184,"visual_prior_value":1621.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-101","text_snippet":"2,184","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-101","text_snippet":"1,621.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2184,"prior_value":1621.6},{"tag":"us-gaap:InterestAndDividendIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest and Dividend Income, Operating","current_period_value":924,"prior_period_value":739.0,"visual_current_value":924,"visual_prior_value":739.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-35","text_snippet":"924","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-36","text_snippet":"739","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":924,"prior_value":739.0},{"tag":"us-gaap:InterestAndDividendIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest and Dividend Income, Operating","current_period_value":2609,"prior_period_value":2042.0,"visual_current_value":2609,"visual_prior_value":2042.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-37","text_snippet":"2,609","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-38","text_snippet":"2,042","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2609,"prior_value":2042.0},{"tag":"us-gaap:InterestAndDividendIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest and Dividend Income, Operating","current_period_value":2609,"prior_period_value":2042.1,"visual_current_value":2609,"visual_prior_value":2042.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-37","text_snippet":"2,609","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-37","text_snippet":"2,042.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2609,"prior_value":2042.1},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,5.0,4,3.0,2],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":2615,"prior_period_value":2334.0,"visual_current_value":2615,"visual_prior_value":2334.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-131","text_snippet":"2,615","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-132","text_snippet":"2,334","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2615,"prior_value":2334.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,5.0,4,3.0,2],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":8357,"prior_period_value":6107.0,"visual_current_value":8357,"visual_prior_value":6107.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-133","text_snippet":"8,357","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-134","text_snippet":"6,107","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8357,"prior_value":6107.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,5.0,4,3.0,2],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":8357,"prior_period_value":6106.5,"visual_current_value":8357,"visual_prior_value":6106.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-133","text_snippet":"8,357","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-137","text_snippet":"6,106.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8357,"prior_value":6106.5},{"tag":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax","current_period_value":284,"prior_period_value":1561.0,"visual_current_value":284,"visual_prior_value":1561.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-107","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-108","text_snippet":"1,561","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":284,"prior_value":1561.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax","current_period_value":1611,"prior_period_value":1461.0,"visual_current_value":1611,"visual_prior_value":1461.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-109","text_snippet":"1,611","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-110","text_snippet":"1,461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1611,"prior_value":1461.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax","current_period_value":1611,"prior_period_value":1461.1,"visual_current_value":1611,"visual_prior_value":1461.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-109","text_snippet":"1,611","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-109","text_snippet":"1,461.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1611,"prior_value":1461.1},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-111","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-112","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax","current_period_value":1,"prior_period_value":0.0,"visual_current_value":1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-113","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-114","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax","current_period_value":1,"prior_period_value":0.3,"visual_current_value":1,"visual_prior_value":0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-113","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-113","text_snippet":"0.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.3},{"tag":"us-gaap:OtherUnderwritingExpense","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Other Underwriting Expense","current_period_value":3015,"prior_period_value":2670.0,"visual_current_value":3015,"visual_prior_value":2670.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-71","text_snippet":"3,015","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-72","text_snippet":"2,670","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":3015,"prior_value":2670.0},{"tag":"us-gaap:OtherUnderwritingExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Other Underwriting Expense","current_period_value":8423,"prior_period_value":6781.0,"visual_current_value":8423,"visual_prior_value":6781.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-73","text_snippet":"8,423","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-74","text_snippet":"6,781","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8423,"prior_value":6781.0},{"tag":"us-gaap:OtherUnderwritingExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Other Underwriting Expense","current_period_value":8423,"prior_period_value":6781.1,"visual_current_value":8423,"visual_prior_value":6781.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-73","text_snippet":"8,423","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-77","text_snippet":"6,781.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8423,"prior_value":6781.1},{"tag":"us-gaap:PreferredStockDividendsIncomeStatementImpact","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Preferred Stock Dividends, Income Statement Impact","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-127","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-128","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:PreferredStockDividendsIncomeStatementImpact","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","weight":-1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Preferred Stock Dividends, Income Statement Impact","current_period_value":0,"prior_period_value":17.0,"visual_current_value":0,"visual_prior_value":17.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-129","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-130","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":17.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenues","current_period_value":22512,"prior_period_value":19719.0,"visual_current_value":22512,"visual_prior_value":19719.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-59","text_snippet":"22,512","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-60","text_snippet":"19,719","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":22512,"prior_value":19719.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenues","current_period_value":64925,"prior_period_value":55096.0,"visual_current_value":64925,"visual_prior_value":55096.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-61","text_snippet":"64,925","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-62","text_snippet":"55,096","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":64925,"prior_value":55096.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenues","current_period_value":64925,"prior_period_value":55095.8,"visual_current_value":64925,"visual_prior_value":55095.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-61","text_snippet":"64,925","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-65","text_snippet":"55,095.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":64925,"prior_value":55095.8},{"tag":"us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,5.0,4],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Diluted, Adjustment","current_period_value":1.7,"prior_period_value":2.0,"visual_current_value":1.7,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-139","text_snippet":"1.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-140","text_snippet":"2.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1.7,"prior_value":2.0},{"tag":"us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,5.0,4],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Diluted, Adjustment","current_period_value":1.8,"prior_period_value":2.2,"visual_current_value":1.8,"visual_prior_value":2.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-141","text_snippet":"1.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-142","text_snippet":"2.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1.8,"prior_value":2.2},{"tag":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,5.0,4,6.0,5],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Diluted","current_period_value":588.2,"prior_period_value":587.6,"visual_current_value":588.2,"visual_prior_value":587.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-143","text_snippet":"588.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-144","text_snippet":"587.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":588.2,"prior_value":587.6},{"tag":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,5.0,4,6.0,5],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Diluted","current_period_value":588.1,"prior_period_value":587.7,"visual_current_value":588.1,"visual_prior_value":587.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-145","text_snippet":"588.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-146","text_snippet":"587.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":588.1,"prior_value":587.7},{"tag":"us-gaap:WeightedAverageNumberOfSharesOutstandingBasic","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,4.0,3],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Basic","current_period_value":586.5,"prior_period_value":585.6,"visual_current_value":586.5,"visual_prior_value":585.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-135","text_snippet":"586.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-136","text_snippet":"585.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":586.5,"prior_value":585.6},{"tag":"us-gaap:WeightedAverageNumberOfSharesOutstandingBasic","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:EarningsPerShareAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4,4.0,3],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Basic","current_period_value":586.3,"prior_period_value":585.5,"visual_current_value":586.3,"visual_prior_value":585.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-137","text_snippet":"586.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-138","text_snippet":"585.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":586.3,"prior_value":585.5},{"tag":"us-gaap:InvestmentIncomeInvestmentExpense","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":null},{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":-1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investment Income, Investment Expense","current_period_value":10,"prior_period_value":7.0,"visual_current_value":10,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-79","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-80","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":7.0},{"tag":"us-gaap:InvestmentIncomeInvestmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":null},{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":-1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investment Income, Investment Expense","current_period_value":26,"prior_period_value":20.0,"visual_current_value":26,"visual_prior_value":20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-81","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-82","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":26,"prior_value":20.0},{"tag":"us-gaap:InvestmentIncomeInvestmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":null},{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":-1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investment Income, Investment Expense","current_period_value":26,"prior_period_value":20.2,"visual_current_value":26,"visual_prior_value":20.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-81","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-81","text_snippet":"20.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":26,"prior_value":20.2},{"tag":"us-gaap:DebtAndEquitySecuritiesGainLoss","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Gain (Loss)","current_period_value":295,"prior_period_value":288.0,"visual_current_value":295,"visual_prior_value":288.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-47","text_snippet":"295","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-48","text_snippet":"288","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":295,"prior_value":288.0},{"tag":"us-gaap:DebtAndEquitySecuritiesGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Gain (Loss)","current_period_value":470,"prior_period_value":317.0,"visual_current_value":470,"visual_prior_value":317.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-49","text_snippet":"470","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-50","text_snippet":"317","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":470,"prior_value":317.0},{"tag":"us-gaap:DebtAndEquitySecuritiesGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Gain (Loss)","current_period_value":470,"prior_period_value":316.7,"visual_current_value":470,"visual_prior_value":316.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-49","text_snippet":"470","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-53","text_snippet":"316.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":470,"prior_value":316.7},{"tag":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Unrealized Gain (Loss)","current_period_value":283,"prior_period_value":220.0,"visual_current_value":283,"visual_prior_value":220.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-43","text_snippet":"283","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-44","text_snippet":"220","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":283,"prior_value":220.0},{"tag":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Unrealized Gain (Loss)","current_period_value":438,"prior_period_value":622.0,"visual_current_value":438,"visual_prior_value":622.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-45","text_snippet":"438","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-46","text_snippet":"622","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":438,"prior_value":622.0},{"tag":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RealizedInvestmentGainsLossesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","weight":1.0,"order":2.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:DebtAndEquitySecuritiesGainLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Unrealized Gain (Loss)","current_period_value":438,"prior_period_value":621.6,"visual_current_value":438,"visual_prior_value":621.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-45","text_snippet":"438","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-45","text_snippet":"621.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":438,"prior_value":621.6},{"tag":"pgr:FeesAndOtherRevenues","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":306,"prior_period_value":278.0,"visual_current_value":306,"visual_prior_value":278.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-51","text_snippet":"306","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-52","text_snippet":"278","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":306,"prior_value":278.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":34,"prior_period_value":43.0,"visual_current_value":34,"visual_prior_value":43.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1867","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1915","text_snippet":"43","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":43.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1868","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1916","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":272,"prior_period_value":235.0,"visual_current_value":272,"visual_prior_value":235.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1866","text_snippet":"272","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1914","text_snippet":"235","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":272,"prior_value":235.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":896,"prior_period_value":774.0,"visual_current_value":896,"visual_prior_value":774.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-53","text_snippet":"896","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-54","text_snippet":"774","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":896,"prior_value":774.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":112,"prior_period_value":127.0,"visual_current_value":112,"visual_prior_value":127.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1963","text_snippet":"112","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2011","text_snippet":"127","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":112,"prior_value":127.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1964","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2012","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":784,"prior_period_value":647.0,"visual_current_value":784,"visual_prior_value":647.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1962","text_snippet":"784","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2010","text_snippet":"647","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":784,"prior_value":647.0},{"tag":"pgr:FeesAndOtherRevenues","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Fees and other revenues","current_period_value":896,"prior_period_value":774.4,"visual_current_value":896,"visual_prior_value":774.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-53","text_snippet":"896","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-57","text_snippet":"774.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":896,"prior_value":774.4},{"tag":"pgr:PolicyholderCreditExpenseProfitLimit","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Policyholder credit expense","current_period_value":950,"prior_period_value":0.0,"visual_current_value":950,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-75","text_snippet":"950","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-76","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":950,"prior_value":0.0},{"tag":"pgr:PolicyholderCreditExpenseProfitLimit","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Policyholder credit expense","current_period_value":950,"prior_period_value":0.0,"visual_current_value":950,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-77","text_snippet":"950","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-78","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":950,"prior_value":0.0},{"tag":"pgr:PolicyholderCreditExpenseProfitLimit","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Policyholder credit expense","current_period_value":950,"prior_period_value":null,"visual_current_value":950,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:StatementGeographicalAxis=stpr:FL","dimensions":[{"axis":"srt:StatementGeographicalAxis","axis_label":"Geography","member":"stpr:FL","member_label":"FL"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-532","char_anchor":"f-2054","text_snippet":"950","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":950,"prior_value":null},{"tag":"pgr:PolicyholderCreditExpenseProfitLimit","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Policyholder credit expense","current_period_value":950,"prior_period_value":null,"visual_current_value":950,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:StatementGeographicalAxis=stpr:FL","dimensions":[{"axis":"srt:StatementGeographicalAxis","axis_label":"Geography","member":"stpr:FL","member_label":"FL"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-533","char_anchor":"f-2055","text_snippet":"950","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":950,"prior_value":null},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":3323,"prior_period_value":2946.0,"visual_current_value":3323,"visual_prior_value":2946.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-95","text_snippet":"3,323","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-96","text_snippet":"2,946","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":3323,"prior_value":2946.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":10541,"prior_period_value":7746.0,"visual_current_value":10541,"visual_prior_value":7746.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-97","text_snippet":"10,541","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-98","text_snippet":"7,746","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":10541,"prior_value":7746.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLossAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":10541,"prior_period_value":7745.1,"visual_current_value":10541,"visual_prior_value":7745.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-97","text_snippet":"10,541","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-97","text_snippet":"7,745.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":10541,"prior_value":7745.1},{"tag":"us-gaap:InterestExpenseDebt","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":7.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,14.0,13],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":4.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":70,"prior_period_value":70.0,"visual_current_value":70,"visual_prior_value":70.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-87","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-88","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":70,"prior_value":70.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":7.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,14.0,13],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":4.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":209,"prior_period_value":209.0,"visual_current_value":209,"visual_prior_value":209.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-89","text_snippet":"209","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-90","text_snippet":"209","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":209,"prior_value":209.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":7.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":7.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,14.0,13],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":4.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":209,"prior_period_value":209.1,"visual_current_value":209,"visual_prior_value":209.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-89","text_snippet":"209","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-89","text_snippet":"209.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":209,"prior_value":209.1},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":13445,"prior_period_value":12510.0,"visual_current_value":13445,"visual_prior_value":12510.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-63","text_snippet":"13,445","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-64","text_snippet":"12,510","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":13445,"prior_value":12510.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":1883,"prior_period_value":1917.0,"visual_current_value":1883,"visual_prior_value":1917.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1887","text_snippet":"1,883","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1935","text_snippet":"1,917","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1883,"prior_value":1917.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":0,"prior_period_value":-1.0,"visual_current_value":0,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1888","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1936","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-1.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":11562,"prior_period_value":10594.0,"visual_current_value":11562,"visual_prior_value":10594.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1886","text_snippet":"11,562","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1934","text_snippet":"10,594","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":11562,"prior_value":10594.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":39854,"prior_period_value":36077.0,"visual_current_value":39854,"visual_prior_value":36077.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-65","text_snippet":"39,854","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-66","text_snippet":"36,077","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":39854,"prior_value":36077.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":5606,"prior_period_value":5674.0,"visual_current_value":5606,"visual_prior_value":5674.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1983","text_snippet":"5,606","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2031","text_snippet":"5,674","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":5606,"prior_value":5674.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":0,"prior_period_value":-4.0,"visual_current_value":0,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1984","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2032","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-4.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":34248,"prior_period_value":30407.0,"visual_current_value":34248,"visual_prior_value":30407.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1982","text_snippet":"34,248","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2030","text_snippet":"30,407","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":34248,"prior_value":30407.0},{"tag":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:BenefitsLossesAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:BenefitsLossesAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Policyholder Benefits and Claims Incurred, Net","current_period_value":39854,"prior_period_value":36077.2,"visual_current_value":39854,"visual_prior_value":36077.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-65","text_snippet":"39,854","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-69","text_snippet":"36,077.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":39854,"prior_value":36077.2},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":20849,"prior_period_value":18297.0,"visual_current_value":20849,"visual_prior_value":18297.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-31","text_snippet":"20,849","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-32","text_snippet":"18,297","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":20849,"prior_value":18297.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":2760,"prior_period_value":2727.0,"visual_current_value":2760,"visual_prior_value":2727.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1863","text_snippet":"2,760","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1911","text_snippet":"2,727","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2760,"prior_value":2727.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1864","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1912","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"Q","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":18089,"prior_period_value":15570.0,"visual_current_value":18089,"visual_prior_value":15570.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1862","text_snippet":"18,089","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1910","text_snippet":"15,570","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":18089,"prior_value":15570.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":60568,"prior_period_value":51655.0,"visual_current_value":60568,"visual_prior_value":51655.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-33","text_snippet":"60,568","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-34","text_snippet":"51,655","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":60568,"prior_value":51655.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":8224,"prior_period_value":7949.0,"visual_current_value":8224,"visual_prior_value":7949.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1959","text_snippet":"8,224","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2007","text_snippet":"7,949","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":8224,"prior_value":7949.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":1,"prior_period_value":0.0,"visual_current_value":1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1960","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2008","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.0},{"tag":"us-gaap:PremiumsEarnedNet","date_type":"YTD","period_type":"duration","presentation_role":"consolidatedstatementsofcomprehensiveincome|segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:RevenuesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consolidatedstatementsofcomprehensiveincome","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"consolidatedstatementsofcomprehensiveincome","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PremiumsEarnedFeesAndOtherRevenue","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Net","current_period_value":52343,"prior_period_value":43706.0,"visual_current_value":52343,"visual_prior_value":43706.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1958","text_snippet":"52,343","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2006","text_snippet":"43,706","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":52343,"prior_value":43706.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":497,"prior_period_value":497.0,"visual_current_value":497,"visual_prior_value":497.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","member_label":"Senior Notes 4.95% Due 2033"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-475","char_anchor":"f-1723","text_snippet":"497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-476","char_anchor":"f-1725","text_snippet":"497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":497,"prior_value":497.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":591,"prior_period_value":591.0,"visual_current_value":591,"visual_prior_value":591.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","member_label":"Senior Notes 4.20% Due 2048"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-491","char_anchor":"f-1755","text_snippet":"591","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-492","char_anchor":"f-1757","text_snippet":"591","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":591,"prior_value":591.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":548,"prior_period_value":547.0,"visual_current_value":548,"visual_prior_value":547.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","member_label":"Senior Notes 4.00% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-459","char_anchor":"f-1691","text_snippet":"548","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-460","char_anchor":"f-1693","text_snippet":"547","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":548,"prior_value":547.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":298,"prior_period_value":298.0,"visual_current_value":298,"visual_prior_value":298.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","member_label":"Senior Notes 6.625% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-455","char_anchor":"f-1683","text_snippet":"298","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-456","char_anchor":"f-1685","text_snippet":"298","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":298,"prior_value":298.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":397,"prior_period_value":397.0,"visual_current_value":397,"visual_prior_value":397.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 6.25% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-471","char_anchor":"f-1715","text_snippet":"397","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-472","char_anchor":"f-1717","text_snippet":"397","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":397,"prior_value":397.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":492,"prior_period_value":491.0,"visual_current_value":492,"visual_prior_value":491.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointNineFivePercentDueTwentyFiftyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointNineFivePercentDueTwentyFiftyMember","member_label":"Senior Notes 3.95% Due 2050"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-495","char_anchor":"f-1763","text_snippet":"492","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-496","char_anchor":"f-1765","text_snippet":"491","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":492,"prior_value":491.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":494,"prior_period_value":494.0,"visual_current_value":494,"visual_prior_value":494.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","member_label":"Senior Notes 3.70% Due 2052"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-499","char_anchor":"f-1771","text_snippet":"494","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-500","char_anchor":"f-1773","text_snippet":"494","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":494,"prior_value":494.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":498,"prior_period_value":498.0,"visual_current_value":498,"visual_prior_value":498.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","member_label":"Senior Notes 3.20% Due 2030"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-463","char_anchor":"f-1699","text_snippet":"498","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-464","char_anchor":"f-1701","text_snippet":"498","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":498,"prior_value":498.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":497,"prior_period_value":497.0,"visual_current_value":497,"visual_prior_value":497.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 3.00% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-467","char_anchor":"f-1707","text_snippet":"497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-468","char_anchor":"f-1709","text_snippet":"497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":497,"prior_value":497.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":499,"prior_period_value":498.0,"visual_current_value":499,"visual_prior_value":498.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.50% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-451","char_anchor":"f-1676","text_snippet":"499","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-452","char_anchor":"f-1678","text_snippet":"498","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":499,"prior_value":498.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":499,"prior_period_value":499.0,"visual_current_value":499,"visual_prior_value":499.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.45% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-447","char_anchor":"f-1668","text_snippet":"499","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-448","char_anchor":"f-1670","text_snippet":"499","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":499,"prior_value":499.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":843,"prior_period_value":842.0,"visual_current_value":843,"visual_prior_value":842.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","member_label":"Senior Notes 4.125% Due 2047"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-487","char_anchor":"f-1747","text_snippet":"843","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-488","char_anchor":"f-1749","text_snippet":"842","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":843,"prior_value":842.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":347,"prior_period_value":347.0,"visual_current_value":347,"visual_prior_value":347.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointthreefivepercentdue2044Member","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointthreefivepercentdue2044Member","member_label":"Senior Notes 4.35% Due 2044"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-479","char_anchor":"f-1731","text_snippet":"347","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-480","char_anchor":"f-1733","text_snippet":"347","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":347,"prior_value":347.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":396,"prior_period_value":396.0,"visual_current_value":396,"visual_prior_value":396.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesthreepointsevenzeropercentduetwentyfortyfiveMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesthreepointsevenzeropercentduetwentyfortyfiveMember","member_label":"Senior Notes 3.70% Due 2045"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-483","char_anchor":"f-1739","text_snippet":"396","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-484","char_anchor":"f-1741","text_snippet":"396","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":396,"prior_value":396.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":6896,"prior_period_value":6892.0,"visual_current_value":6896,"visual_prior_value":6892.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1281","text_snippet":"6,896","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-308","char_anchor":"f-1366","text_snippet":"6,892","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6896,"prior_value":6892.0},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":497,"prior_period_value":496.7,"visual_current_value":497,"visual_prior_value":496.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","member_label":"Senior Notes 4.95% Due 2033"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-475","char_anchor":"f-1723","text_snippet":"497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-519","char_anchor":"f-1824","text_snippet":"496.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":497,"prior_value":496.7},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":591,"prior_period_value":590.8,"visual_current_value":591,"visual_prior_value":590.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","member_label":"Senior Notes 4.20% Due 2048"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-491","char_anchor":"f-1755","text_snippet":"591","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-535","char_anchor":"f-1856","text_snippet":"590.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":591,"prior_value":590.8},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":548,"prior_period_value":547.3,"visual_current_value":548,"visual_prior_value":547.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","member_label":"Senior Notes 4.00% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-459","char_anchor":"f-1691","text_snippet":"548","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-503","char_anchor":"f-1792","text_snippet":"547.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":548,"prior_value":547.3},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":298,"prior_period_value":298.1,"visual_current_value":298,"visual_prior_value":298.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","member_label":"Senior Notes 6.625% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-455","char_anchor":"f-1683","text_snippet":"298","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-499","char_anchor":"f-1784","text_snippet":"298.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":298,"prior_value":298.1},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":397,"prior_period_value":396.9,"visual_current_value":397,"visual_prior_value":396.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 6.25% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-471","char_anchor":"f-1715","text_snippet":"397","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-515","char_anchor":"f-1816","text_snippet":"396.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":397,"prior_value":396.9},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":492,"prior_period_value":491.3,"visual_current_value":492,"visual_prior_value":491.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointNineFivePercentDueTwentyFiftyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointNineFivePercentDueTwentyFiftyMember","member_label":"Senior Notes 3.95% Due 2050"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-495","char_anchor":"f-1763","text_snippet":"492","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-539","char_anchor":"f-1864","text_snippet":"491.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":492,"prior_value":491.3},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":494,"prior_period_value":493.7,"visual_current_value":494,"visual_prior_value":493.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","member_label":"Senior Notes 3.70% Due 2052"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-499","char_anchor":"f-1771","text_snippet":"494","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-543","char_anchor":"f-1872","text_snippet":"493.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":494,"prior_value":493.7},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":498,"prior_period_value":497.6,"visual_current_value":498,"visual_prior_value":497.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","member_label":"Senior Notes 3.20% Due 2030"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-463","char_anchor":"f-1699","text_snippet":"498","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-507","char_anchor":"f-1800","text_snippet":"497.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":498,"prior_value":497.6},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":497,"prior_period_value":496.6,"visual_current_value":497,"visual_prior_value":496.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 3.00% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-467","char_anchor":"f-1707","text_snippet":"497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-511","char_anchor":"f-1808","text_snippet":"496.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":497,"prior_value":496.6},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":499,"prior_period_value":498.5,"visual_current_value":499,"visual_prior_value":498.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.50% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-451","char_anchor":"f-1676","text_snippet":"499","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-495","char_anchor":"f-1777","text_snippet":"498.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":499,"prior_value":498.5},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":499,"prior_period_value":498.9,"visual_current_value":499,"visual_prior_value":498.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.45% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-447","char_anchor":"f-1668","text_snippet":"499","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-491","char_anchor":"f-1769","text_snippet":"498.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":499,"prior_value":498.9},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":843,"prior_period_value":842.4,"visual_current_value":843,"visual_prior_value":842.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","member_label":"Senior Notes 4.125% Due 2047"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-487","char_anchor":"f-1747","text_snippet":"843","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-1848","text_snippet":"842.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":843,"prior_value":842.4},{"tag":"us-gaap:LongTermDebt","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,5.0,4],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt","current_period_value":6896,"prior_period_value":6891.8,"visual_current_value":6896,"visual_prior_value":6891.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1281","text_snippet":"6,896","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-269","char_anchor":"f-1376","text_snippet":"6,891.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6896,"prior_value":6891.8},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":6398,"prior_period_value":6498.0,"visual_current_value":6398,"visual_prior_value":6498.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1280","text_snippet":"6,398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-1365","text_snippet":"6,498","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6398,"prior_value":6498.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":514,"prior_period_value":519.0,"visual_current_value":514,"visual_prior_value":519.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","member_label":"Senior Notes 4.95% Due 2033"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-475","char_anchor":"f-1724","text_snippet":"514","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-476","char_anchor":"f-1726","text_snippet":"519","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":514,"prior_value":519.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":510,"prior_period_value":532.0,"visual_current_value":510,"visual_prior_value":532.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","member_label":"Senior Notes 4.20% Due 2048"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-491","char_anchor":"f-1756","text_snippet":"510","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-492","char_anchor":"f-1758","text_snippet":"532","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":510,"prior_value":532.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":550,"prior_period_value":549.0,"visual_current_value":550,"visual_prior_value":549.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","member_label":"Senior Notes 4.00% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-459","char_anchor":"f-1692","text_snippet":"550","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-460","char_anchor":"f-1694","text_snippet":"549","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":550,"prior_value":549.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":323,"prior_period_value":330.0,"visual_current_value":323,"visual_prior_value":330.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","member_label":"Senior Notes 6.625% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-455","char_anchor":"f-1684","text_snippet":"323","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-456","char_anchor":"f-1686","text_snippet":"330","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":323,"prior_value":330.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":445,"prior_period_value":450.0,"visual_current_value":445,"visual_prior_value":450.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 6.25% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-471","char_anchor":"f-1716","text_snippet":"445","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-472","char_anchor":"f-1718","text_snippet":"450","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":445,"prior_value":450.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":404,"prior_period_value":420.0,"visual_current_value":404,"visual_prior_value":420.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointNineFivePercentDueTwentyFiftyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointNineFivePercentDueTwentyFiftyMember","member_label":"Senior Notes 3.95% Due 2050"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-495","char_anchor":"f-1764","text_snippet":"404","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-496","char_anchor":"f-1766","text_snippet":"420","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":404,"prior_value":420.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":385,"prior_period_value":399.0,"visual_current_value":385,"visual_prior_value":399.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","member_label":"Senior Notes 3.70% Due 2052"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-499","char_anchor":"f-1772","text_snippet":"385","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-500","char_anchor":"f-1774","text_snippet":"399","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":385,"prior_value":399.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":481,"prior_period_value":476.0,"visual_current_value":481,"visual_prior_value":476.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","member_label":"Senior Notes 3.20% Due 2030"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-463","char_anchor":"f-1700","text_snippet":"481","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-464","char_anchor":"f-1702","text_snippet":"476","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":481,"prior_value":476.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":461,"prior_period_value":458.0,"visual_current_value":461,"visual_prior_value":458.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 3.00% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-467","char_anchor":"f-1708","text_snippet":"461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-468","char_anchor":"f-1710","text_snippet":"458","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":461,"prior_value":458.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":490,"prior_period_value":482.0,"visual_current_value":490,"visual_prior_value":482.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.50% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-451","char_anchor":"f-1677","text_snippet":"490","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-452","char_anchor":"f-1679","text_snippet":"482","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":490,"prior_value":482.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":491,"prior_period_value":483.0,"visual_current_value":491,"visual_prior_value":483.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.45% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-447","char_anchor":"f-1669","text_snippet":"491","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-448","char_anchor":"f-1671","text_snippet":"483","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":491,"prior_value":483.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":716,"prior_period_value":750.0,"visual_current_value":716,"visual_prior_value":750.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","member_label":"Senior Notes 4.125% Due 2047"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-487","char_anchor":"f-1748","text_snippet":"716","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-488","char_anchor":"f-1750","text_snippet":"750","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":716,"prior_value":750.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":308,"prior_period_value":319.0,"visual_current_value":308,"visual_prior_value":319.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointthreefivepercentdue2044Member","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointthreefivepercentdue2044Member","member_label":"Senior Notes 4.35% Due 2044"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-479","char_anchor":"f-1732","text_snippet":"308","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-480","char_anchor":"f-1734","text_snippet":"319","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":308,"prior_value":319.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":320,"prior_period_value":331.0,"visual_current_value":320,"visual_prior_value":331.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesthreepointsevenzeropercentduetwentyfortyfiveMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesthreepointsevenzeropercentduetwentyfortyfiveMember","member_label":"Senior Notes 3.70% Due 2045"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-483","char_anchor":"f-1740","text_snippet":"320","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-484","char_anchor":"f-1742","text_snippet":"331","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":320,"prior_value":331.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1277","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-305","char_anchor":"f-1362","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":6398,"prior_period_value":6498.0,"visual_current_value":6398,"visual_prior_value":6498.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1278","text_snippet":"6,398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-306","char_anchor":"f-1363","text_snippet":"6,498","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6398,"prior_value":6498.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1279","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-307","char_anchor":"f-1364","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":6398,"prior_period_value":6498.3,"visual_current_value":6398,"visual_prior_value":6498.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1280","text_snippet":"6,398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-1375","text_snippet":"6,498.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6398,"prior_value":6498.3},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":514,"prior_period_value":518.7,"visual_current_value":514,"visual_prior_value":518.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointNineFivePercentDueTwentyThirtyThreeMember","member_label":"Senior Notes 4.95% Due 2033"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-475","char_anchor":"f-1724","text_snippet":"514","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-519","char_anchor":"f-1825","text_snippet":"518.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":514,"prior_value":518.7},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":510,"prior_period_value":532.3,"visual_current_value":510,"visual_prior_value":532.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointTwoZeroPercentDueTwentyFortyEightMember","member_label":"Senior Notes 4.20% Due 2048"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-491","char_anchor":"f-1756","text_snippet":"510","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-535","char_anchor":"f-1857","text_snippet":"532.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":510,"prior_value":532.3},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":550,"prior_period_value":548.6,"visual_current_value":550,"visual_prior_value":548.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesFourPointZeroZeroPercentDueTwentyTwentyNineMember","member_label":"Senior Notes 4.00% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-459","char_anchor":"f-1692","text_snippet":"550","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-503","char_anchor":"f-1793","text_snippet":"548.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":550,"prior_value":548.6},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":323,"prior_period_value":330.1,"visual_current_value":323,"visual_prior_value":330.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointSixTwoFivePercentDueTwentyTwentyNineMember","member_label":"Senior Notes 6.625% Due 2029"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-455","char_anchor":"f-1684","text_snippet":"323","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-499","char_anchor":"f-1785","text_snippet":"330.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":323,"prior_value":330.1},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":445,"prior_period_value":449.9,"visual_current_value":445,"visual_prior_value":449.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesSixPointTwoFivePercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 6.25% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-471","char_anchor":"f-1716","text_snippet":"445","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-515","char_anchor":"f-1817","text_snippet":"449.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":445,"prior_value":449.9},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":385,"prior_period_value":399.5,"visual_current_value":385,"visual_prior_value":399.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointSevenZeroPercentDueTwentyFiftyTwoMember","member_label":"Senior Notes 3.70% Due 2052"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-499","char_anchor":"f-1772","text_snippet":"385","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-543","char_anchor":"f-1873","text_snippet":"399.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":385,"prior_value":399.5},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":481,"prior_period_value":476.1,"visual_current_value":481,"visual_prior_value":476.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointTwoZeroPercentDueTwentyThirtyMember","member_label":"Senior Notes 3.20% Due 2030"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-463","char_anchor":"f-1700","text_snippet":"481","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-507","char_anchor":"f-1801","text_snippet":"476.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":481,"prior_value":476.1},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":461,"prior_period_value":458.5,"visual_current_value":461,"visual_prior_value":458.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesThreePointZeroZeroPercentDueTwentyThirtyTwoMember","member_label":"Senior Notes 3.00% Due 2032"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-467","char_anchor":"f-1708","text_snippet":"461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-511","char_anchor":"f-1809","text_snippet":"458.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":461,"prior_value":458.5},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":490,"prior_period_value":482.1,"visual_current_value":490,"visual_prior_value":482.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.50% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-451","char_anchor":"f-1677","text_snippet":"490","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-495","char_anchor":"f-1778","text_snippet":"482.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":490,"prior_value":482.1},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":491,"prior_period_value":483.2,"visual_current_value":491,"visual_prior_value":483.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesTwoPointFourFivePercentDueTwentyTwentySevenMember","member_label":"Senior Notes 2.45% Due 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-447","char_anchor":"f-1669","text_snippet":"491","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-491","char_anchor":"f-1770","text_snippet":"483.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":491,"prior_value":483.2},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":716,"prior_period_value":749.8,"visual_current_value":716,"visual_prior_value":749.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointonetwofivepercentduetwentyfortysevenMember","member_label":"Senior Notes 4.125% Due 2047"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-487","char_anchor":"f-1748","text_snippet":"716","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-1849","text_snippet":"749.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":716,"prior_value":749.8},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":308,"prior_period_value":318.9,"visual_current_value":308,"visual_prior_value":318.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesfourpointthreefivepercentdue2044Member","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesfourpointthreefivepercentdue2044Member","member_label":"Senior Notes 4.35% Due 2044"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-479","char_anchor":"f-1732","text_snippet":"308","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1833","text_snippet":"318.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":308,"prior_value":318.9},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":320,"prior_period_value":330.6,"visual_current_value":320,"visual_prior_value":330.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:DebtInstrumentAxis=pgr:SeniorNotesthreepointsevenzeropercentduetwentyfortyfiveMember","dimensions":[{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"pgr:SeniorNotesthreepointsevenzeropercentduetwentyfortyfiveMember","member_label":"Senior Notes 3.70% Due 2045"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-483","char_anchor":"f-1740","text_snippet":"320","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-527","char_anchor":"f-1841","text_snippet":"330.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":320,"prior_value":330.6},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"debtsummaryofdebtdetail|fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,4.0,3],"section_concept":null,"section_label":null},{"role":"debtsummaryofdebtdetail","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":6398,"prior_period_value":6498.3,"visual_current_value":6398,"visual_prior_value":6498.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1278","text_snippet":"6,398","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-267","char_anchor":"f-1373","text_snippet":"6,498.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6398,"prior_value":6498.3},{"tag":"us-gaap:DividendsPayableCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"dividendsdetails|supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Dividends Payable","current_period_value":59,"prior_period_value":59.0,"visual_current_value":59,"visual_prior_value":59.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-27","char_anchor":"f-1849","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-28","char_anchor":"f-1850","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":59,"prior_value":59.0},{"tag":"us-gaap:DividendsPayableCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"dividendsdetails|supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Dividends Payable","current_period_value":59,"prior_period_value":null,"visual_current_value":59,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-27","char_anchor":"f-1849","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":59,"prior_value":null},{"tag":"us-gaap:DividendsPayableCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"dividendsdetails|supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null},{"role":"dividendsdetails","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Dividends Payable","current_period_value":59,"prior_period_value":null,"visual_current_value":59,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:DividendsAxis=pgr:O2025Q3DividendsMember|us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:DividendsAxis","axis_label":"Dividends","member":"pgr:O2025Q3DividendsMember","member_label":"O2025Q3"},{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-541","char_anchor":"f-2088","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":59,"prior_value":null},{"tag":"dei:CityAreaCode","date_type":"YTD","period_type":"duration","presentation_role":"documentandentityinformation","presentation_hierarchy":[{"role":"documentandentityinformation","parent":"dei:CoverAbstract","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"City Area Code","current_period_value":440,"prior_period_value":440.0,"visual_current_value":440,"visual_prior_value":440.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-12","text_snippet":"440","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-12","text_snippet":"440","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":null,"current_value":440,"prior_value":440.0},{"tag":"dei:DocumentFiscalYearFocus","date_type":"YTD","period_type":"duration","presentation_role":"documentandentityinformation","presentation_hierarchy":[{"role":"documentandentityinformation","parent":"dei:CoverAbstract","order":28.0,"preferred_label_role":"terseLabel","global_sort_position":[0,28.0,27],"section_concept":null,"section_label":null}],"concept_label":"Document Fiscal Year Focus","current_period_value":2025,"prior_period_value":2024.0,"visual_current_value":2025,"visual_prior_value":2024.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-28","text_snippet":"2025","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-28","text_snippet":"2024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":null,"current_value":2025,"prior_value":2024.0},{"tag":"dei:EntityAddressPostalZipCode","date_type":"YTD","period_type":"duration","presentation_role":"documentandentityinformation","presentation_hierarchy":[{"role":"documentandentityinformation","parent":"dei:CoverAbstract","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Entity Address Postal Zip Code","current_period_value":44143,"prior_period_value":44143.0,"visual_current_value":44143,"visual_prior_value":44143.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-11","text_snippet":"44143","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-11","text_snippet":"44143","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":null,"current_value":44143,"prior_value":44143.0},{"tag":"dei:EntityCentralIndexKey","date_type":"YTD","period_type":"duration","presentation_role":"documentandentityinformation","presentation_hierarchy":[{"role":"documentandentityinformation","parent":"dei:CoverAbstract","order":26.0,"preferred_label_role":"terseLabel","global_sort_position":[0,26.0,25],"section_concept":null,"section_label":null}],"concept_label":"Entity Central Index Key","current_period_value":80661,"prior_period_value":80661.0,"visual_current_value":80661,"visual_prior_value":80661.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-26","text_snippet":"0000080661","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-26","text_snippet":"0000080661","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":null,"current_value":80661,"prior_value":80661.0},{"tag":"pgr:VendorQuotedPricesPercentofFVHierarchyLevel","date_type":"Q","period_type":"instant","presentation_role":"fairvalueadditionalinformationdetail","presentation_hierarchy":[{"role":"fairvalueadditionalinformationdetail","parent":"pgr:FairValueMeasurementsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Vendor quoted prices, percent of FV hierarchy level","current_period_value":99,"prior_period_value":100.0,"visual_current_value":99,"visual_prior_value":100.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1454","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-306","char_anchor":"f-1456","text_snippet":"100","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":99,"prior_value":100.0},{"tag":"pgr:VendorQuotedPricesPercentofFVHierarchyLevel","date_type":"Q","period_type":"instant","presentation_role":"fairvalueadditionalinformationdetail","presentation_hierarchy":[{"role":"fairvalueadditionalinformationdetail","parent":"pgr:FairValueMeasurementsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Vendor quoted prices, percent of FV hierarchy level","current_period_value":93,"prior_period_value":93.0,"visual_current_value":93,"visual_prior_value":93.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1452","text_snippet":"93","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-266","char_anchor":"f-1569","text_snippet":"93","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":93,"prior_value":93.0},{"tag":"pgr:VendorQuotedPricesPercentofFVHierarchyLevel","date_type":"Q","period_type":"instant","presentation_role":"fairvalueadditionalinformationdetail","presentation_hierarchy":[{"role":"fairvalueadditionalinformationdetail","parent":"pgr:FairValueMeasurementsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Vendor quoted prices, percent of FV hierarchy level","current_period_value":99,"prior_period_value":99.0,"visual_current_value":99,"visual_prior_value":99.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1454","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-267","char_anchor":"f-1571","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":99,"prior_value":99.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4485,"prior_period_value":4232.0,"visual_current_value":4485,"visual_prior_value":4232.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1270","text_snippet":"4,485","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-1355","text_snippet":"4,232","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4485,"prior_value":4232.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":34,"prior_period_value":23.0,"visual_current_value":34,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-255","char_anchor":"f-1260","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-322","char_anchor":"f-1345","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":23.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-252","char_anchor":"f-1257","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-319","char_anchor":"f-1342","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-253","char_anchor":"f-1258","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-320","char_anchor":"f-1343","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":34,"prior_period_value":23.0,"visual_current_value":34,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-254","char_anchor":"f-1259","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-321","char_anchor":"f-1344","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":23.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":34,"prior_period_value":23.0,"visual_current_value":34,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-256","char_anchor":"f-1261","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-323","char_anchor":"f-1346","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":23.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4013,"prior_period_value":3474.0,"visual_current_value":4013,"visual_prior_value":3474.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-250","char_anchor":"f-1255","text_snippet":"4,013","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-317","char_anchor":"f-1340","text_snippet":"3,474","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":4013,"prior_value":3474.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4004,"prior_period_value":3452.0,"visual_current_value":4004,"visual_prior_value":3452.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-247","char_anchor":"f-1252","text_snippet":"4,004","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-314","char_anchor":"f-1337","text_snippet":"3,452","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4004,"prior_value":3452.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-248","char_anchor":"f-1253","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-315","char_anchor":"f-1338","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":9,"prior_period_value":22.0,"visual_current_value":9,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-249","char_anchor":"f-1254","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-316","char_anchor":"f-1339","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":22.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":774,"prior_period_value":710.0,"visual_current_value":774,"visual_prior_value":710.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-251","char_anchor":"f-1256","text_snippet":"774","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-318","char_anchor":"f-1341","text_snippet":"710","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":774,"prior_value":710.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4047,"prior_period_value":3497.0,"visual_current_value":4047,"visual_prior_value":3497.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-260","char_anchor":"f-1265","text_snippet":"4,047","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-327","char_anchor":"f-1350","text_snippet":"3,497","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4047,"prior_value":3497.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4004,"prior_period_value":3452.0,"visual_current_value":4004,"visual_prior_value":3452.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-257","char_anchor":"f-1262","text_snippet":"4,004","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-324","char_anchor":"f-1347","text_snippet":"3,452","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4004,"prior_value":3452.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-258","char_anchor":"f-1263","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-325","char_anchor":"f-1348","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":43,"prior_period_value":45.0,"visual_current_value":43,"visual_prior_value":45.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-259","char_anchor":"f-1264","text_snippet":"43","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-326","char_anchor":"f-1349","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":43,"prior_value":45.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":808,"prior_period_value":733.0,"visual_current_value":808,"visual_prior_value":733.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-261","char_anchor":"f-1266","text_snippet":"808","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-328","char_anchor":"f-1351","text_snippet":"733","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":808,"prior_value":733.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":438,"prior_period_value":735.0,"visual_current_value":438,"visual_prior_value":735.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-245","char_anchor":"f-1250","text_snippet":"438","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-312","char_anchor":"f-1335","text_snippet":"735","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":438,"prior_value":735.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-242","char_anchor":"f-1247","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-309","char_anchor":"f-1332","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":378,"prior_period_value":683.0,"visual_current_value":378,"visual_prior_value":683.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-243","char_anchor":"f-1248","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-310","char_anchor":"f-1333","text_snippet":"683","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":378,"prior_value":683.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":60,"prior_period_value":52.0,"visual_current_value":60,"visual_prior_value":52.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-244","char_anchor":"f-1249","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-311","char_anchor":"f-1334","text_snippet":"52","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":52.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":454,"prior_period_value":760.0,"visual_current_value":454,"visual_prior_value":760.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-246","char_anchor":"f-1251","text_snippet":"454","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-313","char_anchor":"f-1336","text_snippet":"760","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":454,"prior_value":760.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4004,"prior_period_value":3452.0,"visual_current_value":4004,"visual_prior_value":3452.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1267","text_snippet":"4,004","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-305","char_anchor":"f-1352","text_snippet":"3,452","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4004,"prior_value":3452.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":378,"prior_period_value":683.0,"visual_current_value":378,"visual_prior_value":683.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1268","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-306","char_anchor":"f-1353","text_snippet":"683","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":378,"prior_value":683.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":103,"prior_period_value":97.0,"visual_current_value":103,"visual_prior_value":97.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1269","text_snippet":"103","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-307","char_anchor":"f-1354","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":103,"prior_value":97.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":1262,"prior_period_value":1493.0,"visual_current_value":1262,"visual_prior_value":1493.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1271","text_snippet":"1,262","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-308","char_anchor":"f-1356","text_snippet":"1,493","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1262,"prior_value":1493.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":34,"prior_period_value":22.5,"visual_current_value":34,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-255","char_anchor":"f-1260","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-283","char_anchor":"f-1355","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":22.5},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":34,"prior_period_value":22.5,"visual_current_value":34,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-254","char_anchor":"f-1259","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-282","char_anchor":"f-1354","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":22.5},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":34,"prior_period_value":22.5,"visual_current_value":34,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-256","char_anchor":"f-1261","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-284","char_anchor":"f-1356","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":22.5},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":4013,"prior_period_value":3474.5,"visual_current_value":4013,"visual_prior_value":3474.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-250","char_anchor":"f-1255","text_snippet":"4,013","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-278","char_anchor":"f-1350","text_snippet":"3,474.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":4013,"prior_value":3474.5},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":9,"prior_period_value":22.5,"visual_current_value":9,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-249","char_anchor":"f-1254","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-277","char_anchor":"f-1349","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":22.5},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":774,"prior_period_value":711.0,"visual_current_value":774,"visual_prior_value":711.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-251","char_anchor":"f-1256","text_snippet":"774","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-279","char_anchor":"f-1351","text_snippet":"711.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":774,"prior_value":711.0},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":808,"prior_period_value":733.5,"visual_current_value":808,"visual_prior_value":733.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:CommonStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-261","char_anchor":"f-1266","text_snippet":"808","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-289","char_anchor":"f-1361","text_snippet":"733.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":808,"prior_value":733.5},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":378,"prior_period_value":683.1,"visual_current_value":378,"visual_prior_value":683.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-243","char_anchor":"f-1248","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-271","char_anchor":"f-1343","text_snippet":"683.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":378,"prior_value":683.1},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":60,"prior_period_value":51.9,"visual_current_value":60,"visual_prior_value":51.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-244","char_anchor":"f-1249","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-272","char_anchor":"f-1344","text_snippet":"51.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":51.9},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":454,"prior_period_value":759.7,"visual_current_value":454,"visual_prior_value":759.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentPortfolioAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"pgr:InvestmentPortfolioAxis","axis_label":"Investment Portfolio","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-246","char_anchor":"f-1251","text_snippet":"454","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-274","char_anchor":"f-1346","text_snippet":"759.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":454,"prior_value":759.7},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":378,"prior_period_value":683.1,"visual_current_value":378,"visual_prior_value":683.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1268","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-267","char_anchor":"f-1363","text_snippet":"683.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":378,"prior_value":683.1},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":103,"prior_period_value":96.9,"visual_current_value":103,"visual_prior_value":96.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1269","text_snippet":"103","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-268","char_anchor":"f-1364","text_snippet":"96.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":103,"prior_value":96.9},{"tag":"us-gaap:EquitySecuritiesFvNiCurrentAndNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,7.0,6,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI","current_period_value":1262,"prior_period_value":1493.2,"visual_current_value":1262,"visual_prior_value":1493.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1271","text_snippet":"1,262","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-269","char_anchor":"f-1366","text_snippet":"1,493.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1262,"prior_value":1493.2},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":94509,"prior_period_value":79400.0,"visual_current_value":94509,"visual_prior_value":79400.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-578","text_snippet":"94,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-662","text_snippet":"79,400","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":94509,"prior_value":79400.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":34,"prior_period_value":23.0,"visual_current_value":34,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:ThirdPartyPricingExemptionSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:ThirdPartyPricingExemptionSecuritiesMember","member_label":"Third Party Pricing Exemption Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-429","char_anchor":"f-1632","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-437","char_anchor":"f-1647","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":23.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":74,"prior_period_value":77.0,"visual_current_value":74,"visual_prior_value":77.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-428","char_anchor":"f-1631","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-436","char_anchor":"f-1646","text_snippet":"77","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":74,"prior_value":77.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":9,"prior_period_value":22.0,"visual_current_value":9,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-1627","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-434","char_anchor":"f-1642","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":22.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":5,"prior_period_value":3.0,"visual_current_value":5,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-422","char_anchor":"f-1619","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-430","char_anchor":"f-1634","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":3.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":60,"prior_period_value":52.0,"visual_current_value":60,"visual_prior_value":52.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-424","char_anchor":"f-1623","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-432","char_anchor":"f-1638","text_snippet":"52","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":52.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":56757,"prior_period_value":48636.0,"visual_current_value":56757,"visual_prior_value":48636.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1272","text_snippet":"56,757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-305","char_anchor":"f-1357","text_snippet":"48,636","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":56757,"prior_value":48636.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":37644,"prior_period_value":30664.0,"visual_current_value":37644,"visual_prior_value":30664.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1273","text_snippet":"37,644","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-306","char_anchor":"f-1358","text_snippet":"30,664","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37644,"prior_value":30664.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":108,"prior_period_value":100.0,"visual_current_value":108,"visual_prior_value":100.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1274","text_snippet":"108","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-307","char_anchor":"f-1359","text_snippet":"100","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":108,"prior_value":100.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":91024,"prior_period_value":76845.0,"visual_current_value":91024,"visual_prior_value":76845.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1276","text_snippet":"91,024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-308","char_anchor":"f-1361","text_snippet":"76,845","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":91024,"prior_value":76845.0},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":94509,"prior_period_value":79399.7,"visual_current_value":94509,"visual_prior_value":79399.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-578","text_snippet":"94,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-605","text_snippet":"79,399.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":94509,"prior_value":79399.7},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":34,"prior_period_value":22.5,"visual_current_value":34,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:ThirdPartyPricingExemptionSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:ThirdPartyPricingExemptionSecuritiesMember","member_label":"Third Party Pricing Exemption Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-429","char_anchor":"f-1632","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-475","char_anchor":"f-1737","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":22.5},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":74,"prior_period_value":77.4,"visual_current_value":74,"visual_prior_value":77.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-428","char_anchor":"f-1631","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-474","char_anchor":"f-1736","text_snippet":"77.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":74,"prior_value":77.4},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":9,"prior_period_value":22.5,"visual_current_value":9,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-1627","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-472","char_anchor":"f-1732","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":22.5},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":60,"prior_period_value":51.9,"visual_current_value":60,"visual_prior_value":51.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-424","char_anchor":"f-1623","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-470","char_anchor":"f-1728","text_snippet":"51.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":51.9},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":56757,"prior_period_value":48635.3,"visual_current_value":56757,"visual_prior_value":48635.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1272","text_snippet":"56,757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-266","char_anchor":"f-1367","text_snippet":"48,635.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":56757,"prior_value":48635.3},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":37644,"prior_period_value":30664.5,"visual_current_value":37644,"visual_prior_value":30664.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1273","text_snippet":"37,644","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-267","char_anchor":"f-1368","text_snippet":"30,664.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37644,"prior_value":30664.5},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":108,"prior_period_value":99.9,"visual_current_value":108,"visual_prior_value":99.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1274","text_snippet":"108","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-268","char_anchor":"f-1369","text_snippet":"99.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":108,"prior_value":99.9},{"tag":"us-gaap:InvestmentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail|fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails|investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":4.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"fairvaluecompositionofinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,7.0,6,3.0,2],"section_concept":null,"section_label":null},{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Fair Value Disclosure","current_period_value":91024,"prior_period_value":76844.9,"visual_current_value":91024,"visual_prior_value":76844.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:CarryingReportedAmountFairValueDisclosureMember","member_label":"Carrying Reported Amount Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1276","text_snippet":"91,024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-269","char_anchor":"f-1371","text_snippet":"76,844.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":91024,"prior_value":76844.9},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1494","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1534","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-402","char_anchor":"f-1486","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-410","char_anchor":"f-1526","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1478","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-407","char_anchor":"f-1518","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1462","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1502","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1470","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1510","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1574","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1614","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1566","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-421","char_anchor":"f-1606","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-413","char_anchor":"f-1558","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-419","char_anchor":"f-1598","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1542","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1582","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1550","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1590","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1495","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1535","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-402","char_anchor":"f-1487","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-410","char_anchor":"f-1527","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1479","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-407","char_anchor":"f-1519","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1463","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1503","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1471","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1511","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":14,"prior_period_value":12.0,"visual_current_value":-14,"visual_prior_value":-12.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1575","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1615","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-14,"prior_value":-12.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1567","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-421","char_anchor":"f-1607","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":14,"prior_period_value":0.0,"visual_current_value":-14,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-413","char_anchor":"f-1559","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-419","char_anchor":"f-1599","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-14,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1543","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1583","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":12.0,"visual_current_value":0,"visual_prior_value":-12.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1551","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1591","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-12.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":14,"prior_period_value":12.1,"visual_current_value":-14,"visual_prior_value":-12.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1575","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1688","text_snippet":"12.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-14,"prior_value":-12.1},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)","current_period_value":0,"prior_period_value":12.1,"visual_current_value":0,"visual_prior_value":-12.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1551","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-147","char_anchor":"f-1664","text_snippet":"12.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-12.1},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1492","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1532","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-402","char_anchor":"f-1484","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-410","char_anchor":"f-1524","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1476","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-407","char_anchor":"f-1516","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1460","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1500","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1468","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1508","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":8,"prior_period_value":0.0,"visual_current_value":8,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1572","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1612","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1564","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-421","char_anchor":"f-1604","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-413","char_anchor":"f-1556","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-419","char_anchor":"f-1596","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1540","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1580","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases","current_period_value":8,"prior_period_value":0.0,"visual_current_value":8,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1548","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1588","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1493","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1533","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-402","char_anchor":"f-1485","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-410","char_anchor":"f-1525","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1477","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-407","char_anchor":"f-1517","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1461","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1501","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1469","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1509","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1573","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1613","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1565","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-421","char_anchor":"f-1605","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-413","char_anchor":"f-1557","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-419","char_anchor":"f-1597","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1541","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1581","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1549","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1589","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":-2,"prior_period_value":1.0,"visual_current_value":2,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1491","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1531","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-1.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":-2,"prior_period_value":1.0,"visual_current_value":2,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-402","char_anchor":"f-1483","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-410","char_anchor":"f-1523","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-1.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1475","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-407","char_anchor":"f-1515","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1459","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1499","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1467","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1507","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":-9,"prior_period_value":-2.0,"visual_current_value":9,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1571","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1611","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":2.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":-9,"prior_period_value":-2.0,"visual_current_value":9,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1563","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-421","char_anchor":"f-1603","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":2.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-413","char_anchor":"f-1555","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-419","char_anchor":"f-1595","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1539","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1579","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1547","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1587","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":-9,"prior_period_value":-1.9,"visual_current_value":9,"visual_prior_value":1.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1571","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1684","text_snippet":"1.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":1.9},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements","current_period_value":-9,"prior_period_value":-1.9,"visual_current_value":9,"visual_prior_value":1.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1563","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-462","char_anchor":"f-1676","text_snippet":"1.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":1.9},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1496","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1536","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-402","char_anchor":"f-1488","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-410","char_anchor":"f-1528","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1480","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-407","char_anchor":"f-1520","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1464","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1504","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"Q","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1472","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1512","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1576","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1616","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-415","char_anchor":"f-1568","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-421","char_anchor":"f-1608","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-413","char_anchor":"f-1560","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-419","char_anchor":"f-1600","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1544","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1584","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1552","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1592","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":108,"prior_period_value":100.0,"visual_current_value":108,"visual_prior_value":100.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1497","text_snippet":"108","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-1537","text_snippet":"100","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":108,"prior_value":100.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":34,"prior_period_value":23.0,"visual_current_value":34,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-403","char_anchor":"f-1489","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-411","char_anchor":"f-1529","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":23.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":9,"prior_period_value":22.0,"visual_current_value":9,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-400","char_anchor":"f-1481","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-408","char_anchor":"f-1521","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":22.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":5,"prior_period_value":3.0,"visual_current_value":5,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-1465","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-1505","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":3.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":60,"prior_period_value":52.0,"visual_current_value":60,"visual_prior_value":52.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-1473","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-1513","text_snippet":"52","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":52.0},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":108,"prior_period_value":99.9,"visual_current_value":108,"visual_prior_value":99.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1497","text_snippet":"108","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-1618","text_snippet":"99.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":108,"prior_value":99.9},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":34,"prior_period_value":22.5,"visual_current_value":34,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:OtherRiskInvestmentsMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:OtherRiskInvestmentsMember","member_label":"Other risk investments"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-403","char_anchor":"f-1489","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-451","char_anchor":"f-1610","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":22.5},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":9,"prior_period_value":22.5,"visual_current_value":9,"visual_prior_value":22.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=us-gaap:CommonStocksByIndustryMember|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"us-gaap:CommonStocksByIndustryMember","member_label":"Common Stocks By Industry"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-400","char_anchor":"f-1481","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-448","char_anchor":"f-1602","text_snippet":"22.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":22.5},{"tag":"us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue","date_type":"Q","period_type":"instant","presentation_role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofchangesinfairvalueassociatedwithlevel3assetsdetails","parent":"us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value","current_period_value":60,"prior_period_value":51.9,"visual_current_value":60,"visual_prior_value":51.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-1473","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-1594","text_snippet":"51.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":51.9},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageRangeMaximum","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, range, maximum","current_period_value":74.6,"prior_period_value":69.6,"visual_current_value":74.6,"visual_prior_value":69.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-1629","text_snippet":"74.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-435","char_anchor":"f-1644","text_snippet":"69.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":74.6,"prior_value":69.6},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageRangeMaximum","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, range, maximum","current_period_value":-0.9,"prior_period_value":10.9,"visual_current_value":-0.9,"visual_prior_value":10.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-423","char_anchor":"f-1621","text_snippet":"0.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-431","char_anchor":"f-1636","text_snippet":"10.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":-0.9,"prior_value":10.9},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageRangeMaximum","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, range, maximum","current_period_value":11.3,"prior_period_value":25.0,"visual_current_value":11.3,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-425","char_anchor":"f-1625","text_snippet":"11.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-433","char_anchor":"f-1640","text_snippet":"25.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":11.3,"prior_value":25.0},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageRangeMinimum","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, range, minimum","current_period_value":-21.5,"prior_period_value":-19.1,"visual_current_value":-21.5,"visual_prior_value":-19.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-1628","text_snippet":"21.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-435","char_anchor":"f-1643","text_snippet":"19.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":-21.5,"prior_value":-19.1},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageRangeMinimum","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, range, minimum","current_period_value":-1,"prior_period_value":-3.1,"visual_current_value":-1,"visual_prior_value":-3.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-423","char_anchor":"f-1620","text_snippet":"1.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-431","char_anchor":"f-1635","text_snippet":"3.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":-1,"prior_value":-3.1},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageRangeMinimum","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, range, minimum","current_period_value":-6.6,"prior_period_value":4.0,"visual_current_value":-6.6,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-425","char_anchor":"f-1624","text_snippet":"6.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-433","char_anchor":"f-1639","text_snippet":"4.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":-6.6,"prior_value":4.0},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageWeightedAverage","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, weighted average","current_period_value":11.3,"prior_period_value":19.0,"visual_current_value":11.3,"visual_prior_value":19.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-1630","text_snippet":"11.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-435","char_anchor":"f-1645","text_snippet":"19.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":11.3,"prior_value":19.0},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageWeightedAverage","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, weighted average","current_period_value":-1,"prior_period_value":2.6,"visual_current_value":-1,"visual_prior_value":2.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-423","char_anchor":"f-1622","text_snippet":"1.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-431","char_anchor":"f-1637","text_snippet":"2.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":-1,"prior_value":2.6},{"tag":"pgr:FairValueInputsMarketCapPriceChangePercentageWeightedAverage","date_type":"YTD","period_type":"duration","presentation_role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","presentation_hierarchy":[{"role":"fairvaluesummaryofquantitativeinformationaboutlevel3fairvaluemeasurementsdetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Fair value inputs, market cap price change percentage, weighted average","current_period_value":3.8,"prior_period_value":18.1,"visual_current_value":3.8,"visual_prior_value":18.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"pgr:InvestmentCategoryAxis=pgr:TotalQuantitativeLevelThreeSecuritiesMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"pgr:InvestmentCategoryAxis","axis_label":"Investment Category [Axis]","member":"pgr:TotalQuantitativeLevelThreeSecuritiesMember","member_label":"Total Quantitative Level Three Securities"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-425","char_anchor":"f-1626","text_snippet":"3.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-433","char_anchor":"f-1641","text_snippet":"18.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":3.8,"prior_value":18.1},{"tag":"us-gaap:AccruedIncomeTaxes","date_type":"Q","period_type":"instant","presentation_role":"incometaxesadditionalinformationdetails","presentation_hierarchy":[{"role":"incometaxesadditionalinformationdetails","parent":"us-gaap:IncomeTaxDisclosureAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Accrued Income Taxes","current_period_value":24,"prior_period_value":null,"visual_current_value":24,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1799","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":"millions","current_value":24,"prior_value":null},{"tag":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","date_type":"Q","period_type":"duration","presentation_role":"incometaxesadditionalinformationdetails","presentation_hierarchy":[{"role":"incometaxesadditionalinformationdetails","parent":"us-gaap:IncomeTaxDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Percent","current_period_value":21.3,"prior_period_value":20.8,"visual_current_value":21.3,"visual_prior_value":20.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1792","text_snippet":"21.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1794","text_snippet":"20.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":21.3,"prior_value":20.8},{"tag":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesadditionalinformationdetails","presentation_hierarchy":[{"role":"incometaxesadditionalinformationdetails","parent":"us-gaap:IncomeTaxDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Percent","current_period_value":20.7,"prior_period_value":20.9,"visual_current_value":20.7,"visual_prior_value":20.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1793","text_snippet":"20.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1795","text_snippet":"20.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":20.7,"prior_value":20.9},{"tag":"ecd:TrdArrDuration","date_type":"Q","period_type":"duration","presentation_role":"insidertradingarrangements","presentation_hierarchy":[{"role":"insidertradingarrangements","parent":"ecd:InsiderTradingArrLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Trd Arr Duration","current_period_value":344,"prior_period_value":null,"visual_current_value":344,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"ecd:IndividualAxis=pgr:JonathanS.BauerMember","dimensions":[{"axis":"ecd:IndividualAxis","axis_label":"Individual","member":"pgr:JonathanS.BauerMember","member_label":"Jonathan S. Bauer [Member]"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-581","char_anchor":"f-2300","text_snippet":"344","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":0,"scale":null,"current_value":344,"prior_value":null},{"tag":"ecd:TrdArrDuration","date_type":"Q","period_type":"duration","presentation_role":"insidertradingarrangements","presentation_hierarchy":[{"role":"insidertradingarrangements","parent":"ecd:InsiderTradingArrLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Trd Arr Duration","current_period_value":99,"prior_period_value":null,"visual_current_value":99,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"ecd:IndividualAxis=pgr:JohnP.SauerlandMember","dimensions":[{"axis":"ecd:IndividualAxis","axis_label":"Individual","member":"pgr:JohnP.SauerlandMember","member_label":"John P. Sauerland [Member]"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-582","char_anchor":"f-2301","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":1,"scale":null,"current_value":99,"prior_value":null},{"tag":"ecd:TrdArrSecuritiesAggAvailAmt","date_type":"Q","period_type":"instant","presentation_role":"insidertradingarrangements","presentation_hierarchy":[{"role":"insidertradingarrangements","parent":"ecd:InsiderTradingArrLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Trd Arr Securities Agg Avail Amt","current_period_value":5000,"prior_period_value":80000.0,"visual_current_value":5000,"visual_prior_value":80000.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"ecd:IndividualAxis=pgr:JohnP.SauerlandMember","dimensions":[{"axis":"ecd:IndividualAxis","axis_label":"Individual","member":"pgr:JohnP.SauerlandMember","member_label":"John P. Sauerland [Member]"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-584","char_anchor":"f-2299","text_snippet":"5,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-659","char_anchor":"f-2377","text_snippet":"80,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":null,"current_value":5000,"prior_value":80000.0},{"tag":"ecd:TrdArrSecuritiesAggAvailAmt","date_type":"Q","period_type":"instant","presentation_role":"insidertradingarrangements","presentation_hierarchy":[{"role":"insidertradingarrangements","parent":"ecd:InsiderTradingArrLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Trd Arr Securities Agg Avail Amt","current_period_value":450,"prior_period_value":null,"visual_current_value":450,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"ecd:IndividualAxis=pgr:JonathanS.BauerMember","dimensions":[{"axis":"ecd:IndividualAxis","axis_label":"Individual","member":"pgr:JonathanS.BauerMember","member_label":"Jonathan S. Bauer [Member]"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-583","char_anchor":"f-2294","text_snippet":"450","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":0,"scale":null,"current_value":450,"prior_value":null},{"tag":"pgr:PercentChangeinInvestmentIncome","date_type":"YTD","period_type":"duration","presentation_role":"investmentsadditionalinformationdetail","presentation_hierarchy":[{"role":"investmentsadditionalinformationdetail","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Percent change in investment income","current_period_value":28,"prior_period_value":48.0,"visual_current_value":28,"visual_prior_value":48.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1194","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1279","text_snippet":"48","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":28,"prior_value":48.0},{"tag":"pgr:PercentChangeinInvestmentIncome","date_type":"Q","period_type":"duration","presentation_role":"investmentsadditionalinformationdetail","presentation_hierarchy":[{"role":"investmentsadditionalinformationdetail","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Percent change in investment income","current_period_value":25,"prior_period_value":null,"visual_current_value":25,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1193","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":0,"scale":"hundredths","current_value":25,"prior_value":null},{"tag":"us-gaap:DepositAssets","date_type":"Q","period_type":"instant","presentation_role":"investmentsadditionalinformationdetail","presentation_hierarchy":[{"role":"investmentsadditionalinformationdetail","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Deposit Assets","current_period_value":788,"prior_period_value":712.0,"visual_current_value":788,"visual_prior_value":712.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-754","text_snippet":"788","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-781","text_snippet":"712.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":788,"prior_value":712.0},{"tag":"us-gaap:EquitySecuritiesFvNiGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails","presentation_hierarchy":[{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Gain (Loss)","current_period_value":289,"prior_period_value":195.0,"visual_current_value":289,"visual_prior_value":195.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1120","text_snippet":"289","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1121","text_snippet":"195","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":289,"prior_value":195.0},{"tag":"us-gaap:EquitySecuritiesFvNiGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails","presentation_hierarchy":[{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Gain (Loss)","current_period_value":462,"prior_period_value":587.0,"visual_current_value":462,"visual_prior_value":587.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1122","text_snippet":"462","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1123","text_snippet":"587","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":462,"prior_value":587.0},{"tag":"us-gaap:EquitySecuritiesFvNiGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails","presentation_hierarchy":[{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Gain (Loss)","current_period_value":462,"prior_period_value":586.6,"visual_current_value":462,"visual_prior_value":586.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1122","text_snippet":"462","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1203","text_snippet":"586.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":462,"prior_value":586.6},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":9,"prior_period_value":-5.0,"visual_current_value":9,"visual_prior_value":-5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1091","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1092","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":-5.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":9,"prior_period_value":2.0,"visual_current_value":9,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-135","char_anchor":"f-1087","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-136","char_anchor":"f-1088","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":2.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":0,"prior_period_value":-7.0,"visual_current_value":0,"visual_prior_value":-7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1083","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1084","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-7.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":41,"prior_period_value":-4.0,"visual_current_value":41,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1093","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1094","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":41,"prior_value":-4.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":44,"prior_period_value":14.0,"visual_current_value":44,"visual_prior_value":14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-137","char_anchor":"f-1089","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-138","char_anchor":"f-1090","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":44,"prior_value":14.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":-3,"prior_period_value":-18.0,"visual_current_value":-3,"visual_prior_value":-18.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1085","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1086","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-18.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":41,"prior_period_value":-4.8,"visual_current_value":41,"visual_prior_value":-4.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1093","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1165","text_snippet":"4.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":41,"prior_value":-4.8},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":44,"prior_period_value":13.5,"visual_current_value":44,"visual_prior_value":13.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-137","char_anchor":"f-1089","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-151","char_anchor":"f-1161","text_snippet":"13.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":44,"prior_value":13.5},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain (Loss)","current_period_value":-3,"prior_period_value":-18.3,"visual_current_value":-3,"visual_prior_value":-18.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1085","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-147","char_anchor":"f-1157","text_snippet":"18.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-18.3},{"tag":"us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Unrealized Gain (Loss)","current_period_value":280,"prior_period_value":200.0,"visual_current_value":280,"visual_prior_value":200.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1107","text_snippet":"280","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1108","text_snippet":"200","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":280,"prior_value":200.0},{"tag":"us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Unrealized Gain (Loss)","current_period_value":421,"prior_period_value":591.0,"visual_current_value":421,"visual_prior_value":591.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1109","text_snippet":"421","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1110","text_snippet":"591","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":421,"prior_value":591.0},{"tag":"us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofequityrealizedgainslossesdetails|investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"investmentscomponentsofequityrealizedgainslossesdetails","parent":"us-gaap:InvestmentsDebtAndEquitySecuritiesAbstract","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Unrealized Gain (Loss)","current_period_value":421,"prior_period_value":591.4,"visual_current_value":421,"visual_prior_value":591.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1109","text_snippet":"421","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1189","text_snippet":"591.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":421,"prior_value":591.4},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":924,"prior_period_value":739.0,"visual_current_value":924,"visual_prior_value":739.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1181","text_snippet":"924","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1182","text_snippet":"739","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":924,"prior_value":739.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":78,"prior_period_value":83.0,"visual_current_value":78,"visual_prior_value":83.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-167","char_anchor":"f-1153","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-168","char_anchor":"f-1154","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":78,"prior_value":83.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":63,"prior_period_value":49.0,"visual_current_value":63,"visual_prior_value":49.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-1149","text_snippet":"63","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-164","char_anchor":"f-1150","text_snippet":"49","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":63,"prior_value":49.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":11,"prior_period_value":8.0,"visual_current_value":11,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember|us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-187","char_anchor":"f-1173","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-188","char_anchor":"f-1174","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":11,"prior_value":8.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":214,"prior_period_value":155.0,"visual_current_value":214,"visual_prior_value":155.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-155","char_anchor":"f-1141","text_snippet":"214","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-156","char_anchor":"f-1142","text_snippet":"155","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":214,"prior_value":155.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":6,"prior_period_value":9.0,"visual_current_value":6,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-183","char_anchor":"f-1169","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-184","char_anchor":"f-1170","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":9.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":38,"prior_period_value":14.0,"visual_current_value":38,"visual_prior_value":14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-159","char_anchor":"f-1145","text_snippet":"38","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-160","char_anchor":"f-1146","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":38,"prior_value":14.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":470,"prior_period_value":396.0,"visual_current_value":470,"visual_prior_value":396.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-147","char_anchor":"f-1133","text_snippet":"470","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-148","char_anchor":"f-1134","text_snippet":"396","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":470,"prior_value":396.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":24,"prior_period_value":16.0,"visual_current_value":24,"visual_prior_value":16.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-151","char_anchor":"f-1137","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-152","char_anchor":"f-1138","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":24,"prior_value":16.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":887,"prior_period_value":713.0,"visual_current_value":887,"visual_prior_value":713.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-171","char_anchor":"f-1157","text_snippet":"887","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-172","char_anchor":"f-1158","text_snippet":"713","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":887,"prior_value":713.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":20,"prior_period_value":9.0,"visual_current_value":20,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-175","char_anchor":"f-1161","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-176","char_anchor":"f-1162","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":20,"prior_value":9.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":907,"prior_period_value":722.0,"visual_current_value":907,"visual_prior_value":722.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InvestmentTypeAxis=us-gaap:AvailableforsaleSecuritiesMember","dimensions":[{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:AvailableforsaleSecuritiesMember","member_label":"Availableforsale Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-179","char_anchor":"f-1165","text_snippet":"907","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-180","char_anchor":"f-1166","text_snippet":"722","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":907,"prior_value":722.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":17,"prior_period_value":17.0,"visual_current_value":17,"visual_prior_value":17.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-191","char_anchor":"f-1177","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-192","char_anchor":"f-1178","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17,"prior_value":17.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":2609,"prior_period_value":2042.0,"visual_current_value":2609,"visual_prior_value":2042.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1183","text_snippet":"2,609","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1184","text_snippet":"2,042","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2609,"prior_value":2042.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":246,"prior_period_value":243.0,"visual_current_value":246,"visual_prior_value":243.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-169","char_anchor":"f-1155","text_snippet":"246","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-170","char_anchor":"f-1156","text_snippet":"243","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":246,"prior_value":243.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":175,"prior_period_value":142.0,"visual_current_value":175,"visual_prior_value":142.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-165","char_anchor":"f-1151","text_snippet":"175","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-166","char_anchor":"f-1152","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":175,"prior_value":142.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":37,"prior_period_value":32.0,"visual_current_value":37,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember|us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-189","char_anchor":"f-1175","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-190","char_anchor":"f-1176","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37,"prior_value":32.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":593,"prior_period_value":417.0,"visual_current_value":593,"visual_prior_value":417.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-157","char_anchor":"f-1143","text_snippet":"593","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-158","char_anchor":"f-1144","text_snippet":"417","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":593,"prior_value":417.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":19,"prior_period_value":30.0,"visual_current_value":19,"visual_prior_value":30.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-185","char_anchor":"f-1171","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-186","char_anchor":"f-1172","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":30.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":95,"prior_period_value":27.0,"visual_current_value":95,"visual_prior_value":27.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-161","char_anchor":"f-1147","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-162","char_anchor":"f-1148","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":95,"prior_value":27.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":1314,"prior_period_value":1064.0,"visual_current_value":1314,"visual_prior_value":1064.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-149","char_anchor":"f-1135","text_snippet":"1,314","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-150","char_anchor":"f-1136","text_snippet":"1,064","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1314,"prior_value":1064.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":64,"prior_period_value":42.0,"visual_current_value":64,"visual_prior_value":42.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-153","char_anchor":"f-1139","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-154","char_anchor":"f-1140","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":64,"prior_value":42.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":2487,"prior_period_value":1935.0,"visual_current_value":2487,"visual_prior_value":1935.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-173","char_anchor":"f-1159","text_snippet":"2,487","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-174","char_anchor":"f-1160","text_snippet":"1,935","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2487,"prior_value":1935.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":66,"prior_period_value":45.0,"visual_current_value":66,"visual_prior_value":45.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-177","char_anchor":"f-1163","text_snippet":"66","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-178","char_anchor":"f-1164","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":66,"prior_value":45.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":2553,"prior_period_value":1980.0,"visual_current_value":2553,"visual_prior_value":1980.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InvestmentTypeAxis=us-gaap:AvailableforsaleSecuritiesMember","dimensions":[{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:AvailableforsaleSecuritiesMember","member_label":"Availableforsale Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-181","char_anchor":"f-1167","text_snippet":"2,553","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-182","char_anchor":"f-1168","text_snippet":"1,980","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2553,"prior_value":1980.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":56,"prior_period_value":62.0,"visual_current_value":56,"visual_prior_value":62.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-193","char_anchor":"f-1179","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-194","char_anchor":"f-1180","text_snippet":"62","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":56,"prior_value":62.0},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":2609,"prior_period_value":2042.1,"visual_current_value":2609,"visual_prior_value":2042.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1183","text_snippet":"2,609","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1268","text_snippet":"2,042.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2609,"prior_value":2042.1},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":246,"prior_period_value":242.6,"visual_current_value":246,"visual_prior_value":242.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-169","char_anchor":"f-1155","text_snippet":"246","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-187","char_anchor":"f-1240","text_snippet":"242.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":246,"prior_value":242.6},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":175,"prior_period_value":141.2,"visual_current_value":175,"visual_prior_value":141.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-165","char_anchor":"f-1151","text_snippet":"175","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-183","char_anchor":"f-1236","text_snippet":"141.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":175,"prior_value":141.2},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":37,"prior_period_value":31.9,"visual_current_value":37,"visual_prior_value":31.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember|us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"},{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-189","char_anchor":"f-1175","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-207","char_anchor":"f-1260","text_snippet":"31.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":37,"prior_value":31.9},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":593,"prior_period_value":416.9,"visual_current_value":593,"visual_prior_value":416.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-157","char_anchor":"f-1143","text_snippet":"593","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-175","char_anchor":"f-1228","text_snippet":"416.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":593,"prior_value":416.9},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":19,"prior_period_value":30.6,"visual_current_value":19,"visual_prior_value":30.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember|us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"},{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-185","char_anchor":"f-1171","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-203","char_anchor":"f-1256","text_snippet":"30.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":30.6},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":95,"prior_period_value":27.2,"visual_current_value":95,"visual_prior_value":27.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-161","char_anchor":"f-1147","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-179","char_anchor":"f-1232","text_snippet":"27.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":95,"prior_value":27.2},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":1314,"prior_period_value":1064.2,"visual_current_value":1314,"visual_prior_value":1064.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-149","char_anchor":"f-1135","text_snippet":"1,314","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-163","char_anchor":"f-1216","text_snippet":"1,064.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1314,"prior_value":1064.2},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":2487,"prior_period_value":1934.3,"visual_current_value":2487,"visual_prior_value":1934.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-173","char_anchor":"f-1159","text_snippet":"2,487","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-191","char_anchor":"f-1244","text_snippet":"1,934.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2487,"prior_value":1934.3},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":66,"prior_period_value":45.3,"visual_current_value":66,"visual_prior_value":45.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-177","char_anchor":"f-1163","text_snippet":"66","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-195","char_anchor":"f-1248","text_snippet":"45.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":66,"prior_value":45.3},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":2553,"prior_period_value":1979.6,"visual_current_value":2553,"visual_prior_value":1979.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InvestmentTypeAxis=us-gaap:AvailableforsaleSecuritiesMember","dimensions":[{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:AvailableforsaleSecuritiesMember","member_label":"Availableforsale Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-181","char_anchor":"f-1167","text_snippet":"2,553","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-199","char_anchor":"f-1252","text_snippet":"1,979.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2553,"prior_value":1979.6},{"tag":"us-gaap:GrossInvestmentIncomeOperating","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:NetInvestmentIncome","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetinvestmentincomedetails","calculation_parent":"us-gaap:NetInvestmentIncome","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Investment Income, Operating","current_period_value":56,"prior_period_value":62.5,"visual_current_value":56,"visual_prior_value":62.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InvestmentTypeAxis=us-gaap:EquitySecuritiesMember","dimensions":[{"axis":"us-gaap:InvestmentTypeAxis","axis_label":"Investment Type","member":"us-gaap:EquitySecuritiesMember","member_label":"Equity Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-193","char_anchor":"f-1179","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-211","char_anchor":"f-1264","text_snippet":"62.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":56,"prior_value":62.5},{"tag":"us-gaap:NetInvestmentIncome","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Net Investment Income","current_period_value":914,"prior_period_value":732.0,"visual_current_value":914,"visual_prior_value":732.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1189","text_snippet":"914","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1190","text_snippet":"732","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":914,"prior_value":732.0},{"tag":"us-gaap:NetInvestmentIncome","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Net Investment Income","current_period_value":2583,"prior_period_value":2022.0,"visual_current_value":2583,"visual_prior_value":2022.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1191","text_snippet":"2,583","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1192","text_snippet":"2,022","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2583,"prior_value":2022.0},{"tag":"us-gaap:NetInvestmentIncome","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetinvestmentincomedetails","presentation_hierarchy":[{"role":"investmentscomponentsofnetinvestmentincomedetails","parent":"us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Net Investment Income","current_period_value":2583,"prior_period_value":2021.9,"visual_current_value":2583,"visual_prior_value":2021.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1191","text_snippet":"2,583","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1276","text_snippet":"2,021.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2583,"prior_value":2021.9},{"tag":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gains (Losses) on Security Sales","current_period_value":12,"prior_period_value":32.0,"visual_current_value":12,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1095","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1096","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":32.0},{"tag":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gains (Losses) on Security Sales","current_period_value":32,"prior_period_value":-341.0,"visual_current_value":32,"visual_prior_value":-341.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1097","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1098","text_snippet":"341","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32,"prior_value":-341.0},{"tag":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gains (Losses) on Security Sales","current_period_value":32,"prior_period_value":-341.2,"visual_current_value":32,"visual_prior_value":-341.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1097","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1169","text_snippet":"341.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":32,"prior_value":-341.2},{"tag":"pgr:DebtandEquitySecuritiesRealizedGains","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gains","current_period_value":19,"prior_period_value":59.0,"visual_current_value":19,"visual_prior_value":59.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1019","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1020","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":59.0},{"tag":"pgr:DebtandEquitySecuritiesRealizedGains","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gains","current_period_value":141,"prior_period_value":77.0,"visual_current_value":141,"visual_prior_value":77.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1021","text_snippet":"141","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1022","text_snippet":"77","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":141,"prior_value":77.0},{"tag":"pgr:DebtandEquitySecuritiesRealizedGains","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Gains","current_period_value":141,"prior_period_value":76.8,"visual_current_value":141,"visual_prior_value":76.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1021","text_snippet":"141","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1077","text_snippet":"76.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":141,"prior_value":76.8},{"tag":"pgr:DebtandEquitySecuritiesRealizedLosses","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":6.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Losses","current_period_value":7,"prior_period_value":27.0,"visual_current_value":-7,"visual_prior_value":-27.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1055","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1056","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-27.0},{"tag":"pgr:DebtandEquitySecuritiesRealizedLosses","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":6.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Debt and Equity Securities, Realized Losses","current_period_value":109,"prior_period_value":418.0,"visual_current_value":-109,"visual_prior_value":-418.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1057","text_snippet":"109","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1058","text_snippet":"418","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-109,"prior_value":-418.0},{"tag":"pgr:RealizedGainLossOnSecuritySalesOtherAssets","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Gain","current_period_value":0,"prior_period_value":36.0,"visual_current_value":0,"visual_prior_value":36.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1099","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1100","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":36.0},{"tag":"pgr:RealizedGainLossOnSecuritySalesOtherAssets","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Gain","current_period_value":0,"prior_period_value":36.0,"visual_current_value":0,"visual_prior_value":36.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1101","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1102","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":36.0},{"tag":"pgr:RealizedGainLossOnSecuritySalesOtherAssets","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Gain","current_period_value":0,"prior_period_value":36.3,"visual_current_value":0,"visual_prior_value":36.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1101","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1173","text_snippet":"36.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":36.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":7,"prior_period_value":45.0,"visual_current_value":7,"visual_prior_value":45.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1003","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1004","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":45.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":6,"prior_period_value":2.0,"visual_current_value":6,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-995","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-996","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":2.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-127","char_anchor":"f-999","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-128","char_anchor":"f-1000","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":1,"prior_period_value":43.0,"visual_current_value":1,"visual_prior_value":43.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-119","char_anchor":"f-991","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-120","char_anchor":"f-992","text_snippet":"43","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":43.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":88,"prior_period_value":51.0,"visual_current_value":88,"visual_prior_value":51.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1005","text_snippet":"88","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1006","text_snippet":"51","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88,"prior_value":51.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":9,"prior_period_value":6.0,"visual_current_value":9,"visual_prior_value":6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-997","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-998","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":6.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":1,"prior_period_value":1.0,"visual_current_value":1,"visual_prior_value":1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-129","char_anchor":"f-1001","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-130","char_anchor":"f-1002","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":78,"prior_period_value":44.0,"visual_current_value":78,"visual_prior_value":44.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-121","char_anchor":"f-993","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-122","char_anchor":"f-994","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":78,"prior_value":44.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":88,"prior_period_value":51.5,"visual_current_value":88,"visual_prior_value":51.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1005","text_snippet":"88","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1061","text_snippet":"51.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88,"prior_value":51.5},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":9,"prior_period_value":5.6,"visual_current_value":9,"visual_prior_value":5.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-997","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-135","char_anchor":"f-1049","text_snippet":"5.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":5.6},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":1,"prior_period_value":1.1,"visual_current_value":1,"visual_prior_value":1.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-129","char_anchor":"f-1001","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-139","char_anchor":"f-1053","text_snippet":"1.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain","current_period_value":78,"prior_period_value":44.4,"visual_current_value":78,"visual_prior_value":44.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-121","char_anchor":"f-993","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-127","char_anchor":"f-1041","text_snippet":"44.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":78,"prior_value":44.4},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":3,"prior_period_value":37.0,"visual_current_value":3,"visual_prior_value":37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1079","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1080","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":37.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-143","char_anchor":"f-1075","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-144","char_anchor":"f-1076","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":2,"prior_period_value":-3.0,"visual_current_value":2,"visual_prior_value":-3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1067","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1068","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-3.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-127","char_anchor":"f-1071","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-128","char_anchor":"f-1072","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":1,"prior_period_value":41.0,"visual_current_value":1,"visual_prior_value":41.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-119","char_anchor":"f-1059","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-120","char_anchor":"f-1060","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":41.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":0,"prior_period_value":-1.0,"visual_current_value":0,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-139","char_anchor":"f-1063","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-140","char_anchor":"f-1064","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-1.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":-9,"prior_period_value":-337.0,"visual_current_value":-9,"visual_prior_value":-337.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1081","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1082","text_snippet":"337","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-337.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":-10,"prior_period_value":-15.0,"visual_current_value":-10,"visual_prior_value":-15.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-145","char_anchor":"f-1077","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-146","char_anchor":"f-1078","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-10,"prior_value":-15.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":2,"prior_period_value":-37.0,"visual_current_value":2,"visual_prior_value":-37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1069","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1070","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-37.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":1,"prior_period_value":1.0,"visual_current_value":1,"visual_prior_value":1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-129","char_anchor":"f-1073","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-130","char_anchor":"f-1074","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":0,"prior_period_value":-285.0,"visual_current_value":0,"visual_prior_value":-285.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-121","char_anchor":"f-1061","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-122","char_anchor":"f-1062","text_snippet":"285","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-285.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":-2,"prior_period_value":-1.0,"visual_current_value":-2,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-141","char_anchor":"f-1065","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-142","char_anchor":"f-1066","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-1.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":-9,"prior_period_value":-336.4,"visual_current_value":-9,"visual_prior_value":-336.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1081","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1153","text_snippet":"336.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-336.4},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":2,"prior_period_value":-37.2,"visual_current_value":2,"visual_prior_value":-37.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1069","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-135","char_anchor":"f-1133","text_snippet":"37.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-37.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":1,"prior_period_value":1.1,"visual_current_value":1,"visual_prior_value":1.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-129","char_anchor":"f-1073","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-139","char_anchor":"f-1137","text_snippet":"1.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":0,"prior_period_value":-284.2,"visual_current_value":0,"visual_prior_value":-284.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-121","char_anchor":"f-1061","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-127","char_anchor":"f-1125","text_snippet":"284.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-284.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtAndEquitySecuritiesRealizedGainsLossesOnSecuritySales","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Gain (Loss)","current_period_value":-2,"prior_period_value":-1.1,"visual_current_value":-2,"visual_prior_value":-1.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-141","char_anchor":"f-1065","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-131","char_anchor":"f-1129","text_snippet":"1.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-1.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":4,"prior_period_value":8.0,"visual_current_value":-4,"visual_prior_value":-8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1039","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1040","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-4,"prior_value":-8.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-143","char_anchor":"f-1035","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-144","char_anchor":"f-1036","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":4,"prior_period_value":5.0,"visual_current_value":-4,"visual_prior_value":-5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-123","char_anchor":"f-1031","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-124","char_anchor":"f-1032","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-4,"prior_value":-5.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":0,"prior_period_value":2.0,"visual_current_value":0,"visual_prior_value":-2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-119","char_anchor":"f-1023","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-120","char_anchor":"f-1024","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-2.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":0,"prior_period_value":1.0,"visual_current_value":0,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-139","char_anchor":"f-1027","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-140","char_anchor":"f-1028","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-1.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":97,"prior_period_value":388.0,"visual_current_value":-97,"visual_prior_value":-388.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1041","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1042","text_snippet":"388","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-97,"prior_value":-388.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":10,"prior_period_value":15.0,"visual_current_value":-10,"visual_prior_value":-15.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-145","char_anchor":"f-1037","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-146","char_anchor":"f-1038","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-10,"prior_value":-15.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":7,"prior_period_value":43.0,"visual_current_value":-7,"visual_prior_value":-43.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1033","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-126","char_anchor":"f-1034","text_snippet":"43","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-43.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":78,"prior_period_value":329.0,"visual_current_value":-78,"visual_prior_value":-329.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-121","char_anchor":"f-1025","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-122","char_anchor":"f-1026","text_snippet":"329","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-78,"prior_value":-329.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":2,"prior_period_value":1.0,"visual_current_value":-2,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-141","char_anchor":"f-1029","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-142","char_anchor":"f-1030","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-1.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":97,"prior_period_value":387.9,"visual_current_value":-97,"visual_prior_value":-387.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1041","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1105","text_snippet":"387.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-97,"prior_value":-387.9},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":7,"prior_period_value":42.8,"visual_current_value":-7,"visual_prior_value":-42.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-125","char_anchor":"f-1033","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-135","char_anchor":"f-1089","text_snippet":"42.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-42.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":78,"prior_period_value":328.6,"visual_current_value":-78,"visual_prior_value":-328.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-121","char_anchor":"f-1025","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-127","char_anchor":"f-1081","text_snippet":"328.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-78,"prior_value":-328.6},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Realized Loss","current_period_value":2,"prior_period_value":1.4,"visual_current_value":-2,"visual_prior_value":-1.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-141","char_anchor":"f-1029","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-131","char_anchor":"f-1085","text_snippet":"1.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-1.4},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":12,"prior_period_value":14.0,"visual_current_value":12,"visual_prior_value":14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1015","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1016","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":14.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":11,"prior_period_value":14.0,"visual_current_value":11,"visual_prior_value":14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-135","char_anchor":"f-1011","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-136","char_anchor":"f-1012","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":11,"prior_value":14.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":1,"prior_period_value":0.0,"visual_current_value":1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1007","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1008","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":53,"prior_period_value":26.0,"visual_current_value":53,"visual_prior_value":26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1017","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1018","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":53,"prior_value":26.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":50,"prior_period_value":26.0,"visual_current_value":50,"visual_prior_value":26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-137","char_anchor":"f-1013","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-138","char_anchor":"f-1014","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":50,"prior_value":26.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":3,"prior_period_value":0.0,"visual_current_value":3,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1009","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1010","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":0.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":53,"prior_period_value":25.3,"visual_current_value":53,"visual_prior_value":25.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1017","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1073","text_snippet":"25.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":53,"prior_value":25.3},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedGain","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedGains","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedGains","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Gain","current_period_value":50,"prior_period_value":25.3,"visual_current_value":50,"visual_prior_value":25.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-137","char_anchor":"f-1013","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-151","char_anchor":"f-1069","text_snippet":"25.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":50,"prior_value":25.3},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":3,"prior_period_value":19.0,"visual_current_value":-3,"visual_prior_value":-19.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1051","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1052","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-19.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":2,"prior_period_value":12.0,"visual_current_value":-2,"visual_prior_value":-12.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-135","char_anchor":"f-1047","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-136","char_anchor":"f-1048","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-12.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":1,"prior_period_value":7.0,"visual_current_value":-1,"visual_prior_value":-7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-131","char_anchor":"f-1043","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-132","char_anchor":"f-1044","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-7.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":12,"prior_period_value":30.0,"visual_current_value":-12,"visual_prior_value":-30.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1053","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1054","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-12,"prior_value":-30.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":6,"prior_period_value":12.0,"visual_current_value":-6,"visual_prior_value":-12.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-137","char_anchor":"f-1049","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-138","char_anchor":"f-1050","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-12.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":6,"prior_period_value":18.0,"visual_current_value":-6,"visual_prior_value":-18.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1045","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-134","char_anchor":"f-1046","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-18.0},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":12,"prior_period_value":30.1,"visual_current_value":-12,"visual_prior_value":-30.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1053","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1117","text_snippet":"30.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-12,"prior_value":-30.1},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":6,"prior_period_value":11.8,"visual_current_value":-6,"visual_prior_value":-11.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-137","char_anchor":"f-1049","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-151","char_anchor":"f-1113","text_snippet":"11.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-11.8},{"tag":"us-gaap:EquitySecuritiesFvNiRealizedLoss","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"pgr:DebtandEquitySecuritiesRealizedLosses","weight":1.0,"order":2.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"pgr:DebtandEquitySecuritiesRealizedLosses","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Realized Loss","current_period_value":6,"prior_period_value":18.3,"visual_current_value":-6,"visual_prior_value":-18.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-133","char_anchor":"f-1045","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-147","char_anchor":"f-1109","text_snippet":"18.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-18.3},{"tag":"us-gaap:UnrealizedGainLossOnHybridInstrumentNet","date_type":"Q","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Unrealized Gain (Loss) on Hybrid Instrument, Net","current_period_value":3,"prior_period_value":20.0,"visual_current_value":3,"visual_prior_value":20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1103","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1104","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":20.0},{"tag":"us-gaap:UnrealizedGainLossOnHybridInstrumentNet","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Unrealized Gain (Loss) on Hybrid Instrument, Net","current_period_value":17,"prior_period_value":31.0,"visual_current_value":17,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1105","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1106","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17,"prior_value":31.0},{"tag":"us-gaap:UnrealizedGainLossOnHybridInstrumentNet","date_type":"YTD","period_type":"duration","presentation_role":"investmentscomponentsofnetrealizedgainslossesdetail","presentation_hierarchy":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"investmentscomponentsofnetrealizedgainslossesdetail","parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentscomponentsofnetrealizedgainslossesdetail","calculation_parent":"us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Unrealized Gain (Loss) on Hybrid Instrument, Net","current_period_value":17,"prior_period_value":30.2,"visual_current_value":17,"visual_prior_value":30.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1105","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1185","text_snippet":"30.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17,"prior_value":30.2},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","weight":1.0,"order":3.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10","current_period_value":26249,"prior_period_value":13103.1,"visual_current_value":26249,"visual_prior_value":13103.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-777","text_snippet":"26,249","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-804","text_snippet":"13,103.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":26249,"prior_value":13103.1},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","weight":1.0,"order":3.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10","current_period_value":26446,"prior_period_value":12954.6,"visual_current_value":26446,"visual_prior_value":12954.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-778","text_snippet":"26,446","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-805","text_snippet":"12,954.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":26446,"prior_value":12954.6},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five","current_period_value":53046,"prior_period_value":53339.8,"visual_current_value":53046,"visual_prior_value":53339.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-775","text_snippet":"53,046","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-802","text_snippet":"53,339.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":53046,"prior_value":53339.8},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","weight":1.0,"order":2.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five","current_period_value":53116,"prior_period_value":53341.8,"visual_current_value":53116,"visual_prior_value":53341.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-776","text_snippet":"53,116","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-803","text_snippet":"53,341.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":53116,"prior_value":53341.8},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","weight":1.0,"order":4.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10","current_period_value":276,"prior_period_value":256.8,"visual_current_value":276,"visual_prior_value":256.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-779","text_snippet":"276","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-806","text_snippet":"256.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":276,"prior_value":256.8},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","weight":1.0,"order":4.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10","current_period_value":279,"prior_period_value":262.0,"visual_current_value":279,"visual_prior_value":262.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-780","text_snippet":"279","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-807","text_snippet":"262.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":279,"prior_value":262.0},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value","current_period_value":88509,"prior_period_value":74411.2,"visual_current_value":88509,"visual_prior_value":74411.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-782","text_snippet":"88,509","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-809","text_snippet":"74,411.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88509,"prior_value":74411.2},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost","current_period_value":88247,"prior_period_value":74595.2,"visual_current_value":88247,"visual_prior_value":74595.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-781","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-808","text_snippet":"74,595.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.2},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","weight":1.0,"order":1.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One","current_period_value":8676,"prior_period_value":7895.5,"visual_current_value":8676,"visual_prior_value":7895.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-773","text_snippet":"8,676","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-800","text_snippet":"7,895.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":8676,"prior_value":7895.5},{"tag":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","presentation_hierarchy":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"investmentscompositionoffixedmaturitiesbymaturitydetail","parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","weight":1.0,"order":1.0}],"calculation_role":"investmentscompositionoffixedmaturitiesbymaturitydetail","calculation_parent":"us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One","current_period_value":8668,"prior_period_value":7852.8,"visual_current_value":8668,"visual_prior_value":7852.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-774","text_snippet":"8,668","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-801","text_snippet":"7,852.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":8668,"prior_value":7852.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":17023,"prior_period_value":22079.0,"visual_current_value":17023,"visual_prior_value":22079.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-845","text_snippet":"17,023","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-917","text_snippet":"22,079","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17023,"prior_value":22079.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":900,"prior_period_value":1178.0,"visual_current_value":900,"visual_prior_value":1178.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-836","text_snippet":"900","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-908","text_snippet":"1,178","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":900,"prior_value":1178.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":2504,"prior_period_value":3580.0,"visual_current_value":2504,"visual_prior_value":3580.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-827","text_snippet":"2,504","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-899","text_snippet":"3,580","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2504,"prior_value":3580.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":2785,"prior_period_value":4825.0,"visual_current_value":2785,"visual_prior_value":4825.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-809","text_snippet":"2,785","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-881","text_snippet":"4,825","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2785,"prior_value":4825.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":97,"prior_period_value":59.0,"visual_current_value":97,"visual_prior_value":59.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-818","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-890","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":97,"prior_value":59.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":9368,"prior_period_value":10850.0,"visual_current_value":9368,"visual_prior_value":10850.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-791","text_snippet":"9,368","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-854","text_snippet":"10,850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9368,"prior_value":10850.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":1369,"prior_period_value":1571.0,"visual_current_value":1369,"visual_prior_value":1571.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-800","text_snippet":"1,369","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-863","text_snippet":"1,571","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1369,"prior_value":1571.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":17023,"prior_period_value":22079.5,"visual_current_value":17023,"visual_prior_value":22079.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-845","text_snippet":"17,023","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-881","text_snippet":"22,079.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17023,"prior_value":22079.5},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":2504,"prior_period_value":3580.1,"visual_current_value":2504,"visual_prior_value":3580.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-827","text_snippet":"2,504","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-115","char_anchor":"f-863","text_snippet":"3,580.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2504,"prior_value":3580.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":2785,"prior_period_value":4824.5,"visual_current_value":2785,"visual_prior_value":4824.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-809","text_snippet":"2,785","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-845","text_snippet":"4,824.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2785,"prior_value":4824.5},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":97,"prior_period_value":59.2,"visual_current_value":97,"visual_prior_value":59.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-818","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-854","text_snippet":"59.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":97,"prior_value":59.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer","current_period_value":9368,"prior_period_value":10850.3,"visual_current_value":9368,"visual_prior_value":10850.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-791","text_snippet":"9,368","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-818","text_snippet":"10,850.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":9368,"prior_value":10850.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":839,"prior_period_value":1252.0,"visual_current_value":-839,"visual_prior_value":-1252.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-846","text_snippet":"839","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-918","text_snippet":"1,252","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-839,"prior_value":-1252.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":32,"prior_period_value":54.0,"visual_current_value":-32,"visual_prior_value":-54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-837","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-909","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-32,"prior_value":-54.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":246,"prior_period_value":377.0,"visual_current_value":-246,"visual_prior_value":-377.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-828","text_snippet":"246","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-900","text_snippet":"377","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-246,"prior_value":-377.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":82,"prior_period_value":153.0,"visual_current_value":-82,"visual_prior_value":-153.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-810","text_snippet":"82","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-882","text_snippet":"153","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-82,"prior_value":-153.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":5,"prior_period_value":6.0,"visual_current_value":-5,"visual_prior_value":-6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-819","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-891","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-6.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":410,"prior_period_value":571.0,"visual_current_value":-410,"visual_prior_value":-571.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-792","text_snippet":"410","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-855","text_snippet":"571","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-410,"prior_value":-571.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":64,"prior_period_value":90.0,"visual_current_value":-64,"visual_prior_value":-90.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-801","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-864","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-64,"prior_value":-90.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":839,"prior_period_value":1251.8,"visual_current_value":-839,"visual_prior_value":-1251.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-846","text_snippet":"839","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-882","text_snippet":"1,251.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-839,"prior_value":-1251.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":32,"prior_period_value":53.7,"visual_current_value":-32,"visual_prior_value":-53.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-837","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-109","char_anchor":"f-873","text_snippet":"53.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-32,"prior_value":-53.7},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":246,"prior_period_value":376.6,"visual_current_value":-246,"visual_prior_value":-376.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-828","text_snippet":"246","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-115","char_anchor":"f-864","text_snippet":"376.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-246,"prior_value":-376.6},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":82,"prior_period_value":153.4,"visual_current_value":-82,"visual_prior_value":-153.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-810","text_snippet":"82","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-846","text_snippet":"153.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-82,"prior_value":-153.4},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":5,"prior_period_value":6.2,"visual_current_value":-5,"visual_prior_value":-6.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-819","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-855","text_snippet":"6.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-6.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":410,"prior_period_value":571.3,"visual_current_value":-410,"visual_prior_value":-571.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-792","text_snippet":"410","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-819","text_snippet":"571.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-410,"prior_value":-571.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss","current_period_value":64,"prior_period_value":90.1,"visual_current_value":-64,"visual_prior_value":-90.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-801","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-113","char_anchor":"f-828","text_snippet":"90.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-64,"prior_value":-90.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":567,"prior_period_value":817.0,"visual_current_value":567,"visual_prior_value":817.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-844","text_snippet":"567","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-916","text_snippet":"817","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":567,"prior_value":817.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":37,"prior_period_value":64.0,"visual_current_value":37,"visual_prior_value":64.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-835","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-907","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":37,"prior_value":64.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":122,"prior_period_value":172.0,"visual_current_value":122,"visual_prior_value":172.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-826","text_snippet":"122","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-898","text_snippet":"172","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":122,"prior_value":172.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":114,"prior_period_value":210.0,"visual_current_value":114,"visual_prior_value":210.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-808","text_snippet":"114","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-880","text_snippet":"210","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":114,"prior_value":210.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":19,"prior_period_value":29.0,"visual_current_value":19,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-817","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-889","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":19,"prior_value":29.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":64,"prior_period_value":83.0,"visual_current_value":64,"visual_prior_value":83.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-790","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-853","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":64,"prior_value":83.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":2.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions","current_period_value":211,"prior_period_value":258.0,"visual_current_value":211,"visual_prior_value":258.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-799","text_snippet":"211","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-862","text_snippet":"258","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":211,"prior_value":258.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":3472,"prior_period_value":3411.0,"visual_current_value":3472,"visual_prior_value":3411.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-842","text_snippet":"3,472","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-914","text_snippet":"3,411","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3472,"prior_value":3411.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":228,"prior_period_value":353.0,"visual_current_value":228,"visual_prior_value":353.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-833","text_snippet":"228","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-905","text_snippet":"353","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":228,"prior_value":353.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":375,"prior_period_value":170.0,"visual_current_value":375,"visual_prior_value":170.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-824","text_snippet":"375","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-896","text_snippet":"170","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":375,"prior_value":170.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":718,"prior_period_value":426.0,"visual_current_value":718,"visual_prior_value":426.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-806","text_snippet":"718","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-878","text_snippet":"426","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":718,"prior_value":426.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":186,"prior_period_value":185.0,"visual_current_value":186,"visual_prior_value":185.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-815","text_snippet":"186","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-887","text_snippet":"185","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":186,"prior_value":185.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":1777,"prior_period_value":2069.0,"visual_current_value":1777,"visual_prior_value":2069.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-788","text_snippet":"1,777","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-851","text_snippet":"2,069","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1777,"prior_value":2069.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":188,"prior_period_value":208.0,"visual_current_value":188,"visual_prior_value":208.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-797","text_snippet":"188","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-860","text_snippet":"208","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":188,"prior_value":208.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":3472,"prior_period_value":3410.5,"visual_current_value":3472,"visual_prior_value":3410.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-842","text_snippet":"3,472","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-878","text_snippet":"3,410.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3472,"prior_value":3410.5},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":228,"prior_period_value":352.5,"visual_current_value":228,"visual_prior_value":352.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-833","text_snippet":"228","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-109","char_anchor":"f-869","text_snippet":"352.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":228,"prior_value":352.5},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":375,"prior_period_value":169.8,"visual_current_value":375,"visual_prior_value":169.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-824","text_snippet":"375","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-115","char_anchor":"f-860","text_snippet":"169.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":375,"prior_value":169.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":718,"prior_period_value":426.1,"visual_current_value":718,"visual_prior_value":426.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-806","text_snippet":"718","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-842","text_snippet":"426.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":718,"prior_value":426.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":1777,"prior_period_value":2069.3,"visual_current_value":1777,"visual_prior_value":2069.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-788","text_snippet":"1,777","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-815","text_snippet":"2,069.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1777,"prior_value":2069.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months","current_period_value":188,"prior_period_value":207.8,"visual_current_value":188,"visual_prior_value":207.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-797","text_snippet":"188","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-113","char_anchor":"f-824","text_snippet":"207.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":188,"prior_value":207.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":11,"prior_period_value":6.0,"visual_current_value":-11,"visual_prior_value":-6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-843","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-915","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-11,"prior_value":-6.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.0,"visual_current_value":-1,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-834","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-906","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.0,"visual_current_value":-1,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-825","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-897","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":4,"prior_period_value":3.0,"visual_current_value":-4,"visual_prior_value":-3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-807","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-879","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-4,"prior_value":-3.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.0,"visual_current_value":-1,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-816","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-888","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":3,"prior_period_value":3.0,"visual_current_value":-3,"visual_prior_value":-3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-789","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-852","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-3.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.0,"visual_current_value":-1,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-798","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-861","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":11,"prior_period_value":5.6,"visual_current_value":-11,"visual_prior_value":-5.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-843","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-879","text_snippet":"5.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-11,"prior_value":-5.6},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.1,"visual_current_value":-1,"visual_prior_value":-0.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-834","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-109","char_anchor":"f-870","text_snippet":"0.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.1},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.3,"visual_current_value":-1,"visual_prior_value":-0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-825","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-115","char_anchor":"f-861","text_snippet":"0.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":4,"prior_period_value":1.9,"visual_current_value":-4,"visual_prior_value":-1.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-807","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-843","text_snippet":"1.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-4,"prior_value":-1.9},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.2,"visual_current_value":-1,"visual_prior_value":-0.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-816","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-852","text_snippet":"0.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":3,"prior_period_value":2.9,"visual_current_value":-3,"visual_prior_value":-2.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-789","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-816","text_snippet":"2.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-2.9},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss","current_period_value":1,"prior_period_value":0.2,"visual_current_value":-1,"visual_prior_value":-0.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-798","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-113","char_anchor":"f-825","text_snippet":"0.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":109,"prior_period_value":86.0,"visual_current_value":109,"visual_prior_value":86.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-841","text_snippet":"109","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-913","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":109,"prior_value":86.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":13,"prior_period_value":16.0,"visual_current_value":13,"visual_prior_value":16.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-832","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-904","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":13,"prior_value":16.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":16,"prior_period_value":5.0,"visual_current_value":16,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-823","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-895","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":16,"prior_value":5.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":24,"prior_period_value":14.0,"visual_current_value":24,"visual_prior_value":14.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-805","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-877","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":24,"prior_value":14.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":9,"prior_period_value":4.0,"visual_current_value":9,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-814","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-886","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":9,"prior_value":4.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":7,"prior_period_value":3.0,"visual_current_value":7,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-787","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-850","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":7,"prior_value":3.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","weight":1.0,"order":1.0}],"calculation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","calculation_parent":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions","current_period_value":40,"prior_period_value":44.0,"visual_current_value":40,"visual_prior_value":44.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-796","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-859","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":40,"prior_value":44.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":20495,"prior_period_value":25490.0,"visual_current_value":20495,"visual_prior_value":25490.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-839","text_snippet":"20,495","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-911","text_snippet":"25,490","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":20495,"prior_value":25490.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":1128,"prior_period_value":1531.0,"visual_current_value":1128,"visual_prior_value":1531.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-830","text_snippet":"1,128","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-902","text_snippet":"1,531","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1128,"prior_value":1531.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":2879,"prior_period_value":3750.0,"visual_current_value":2879,"visual_prior_value":3750.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-821","text_snippet":"2,879","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-893","text_snippet":"3,750","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2879,"prior_value":3750.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":3503,"prior_period_value":5251.0,"visual_current_value":3503,"visual_prior_value":5251.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-803","text_snippet":"3,503","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-875","text_snippet":"5,251","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3503,"prior_value":5251.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":283,"prior_period_value":244.0,"visual_current_value":283,"visual_prior_value":244.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-812","text_snippet":"283","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-884","text_snippet":"244","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":283,"prior_value":244.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":11145,"prior_period_value":12919.0,"visual_current_value":11145,"visual_prior_value":12919.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-785","text_snippet":"11,145","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-848","text_snippet":"12,919","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":11145,"prior_value":12919.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":1557,"prior_period_value":1779.0,"visual_current_value":1557,"visual_prior_value":1779.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-794","text_snippet":"1,557","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-857","text_snippet":"1,779","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1557,"prior_value":1779.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":1128,"prior_period_value":1530.5,"visual_current_value":1128,"visual_prior_value":1530.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-830","text_snippet":"1,128","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-109","char_anchor":"f-866","text_snippet":"1,530.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1128,"prior_value":1530.5},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":2879,"prior_period_value":3749.9,"visual_current_value":2879,"visual_prior_value":3749.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-821","text_snippet":"2,879","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-115","char_anchor":"f-857","text_snippet":"3,749.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2879,"prior_value":3749.9},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":3503,"prior_period_value":5250.6,"visual_current_value":3503,"visual_prior_value":5250.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-803","text_snippet":"3,503","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-839","text_snippet":"5,250.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3503,"prior_value":5250.6},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":283,"prior_period_value":244.2,"visual_current_value":283,"visual_prior_value":244.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-812","text_snippet":"283","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-848","text_snippet":"244.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":283,"prior_value":244.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":11145,"prior_period_value":12919.6,"visual_current_value":11145,"visual_prior_value":12919.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-785","text_snippet":"11,145","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-812","text_snippet":"12,919.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":11145,"prior_value":12919.6},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position","current_period_value":1557,"prior_period_value":1778.8,"visual_current_value":1557,"visual_prior_value":1778.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-794","text_snippet":"1,557","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-113","char_anchor":"f-821","text_snippet":"1,778.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1557,"prior_value":1778.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":850,"prior_period_value":1258.0,"visual_current_value":-850,"visual_prior_value":-1258.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-840","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-912","text_snippet":"1,258","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1258.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":33,"prior_period_value":54.0,"visual_current_value":-33,"visual_prior_value":-54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-831","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-903","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-33,"prior_value":-54.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":247,"prior_period_value":377.0,"visual_current_value":-247,"visual_prior_value":-377.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-822","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-894","text_snippet":"377","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-247,"prior_value":-377.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":86,"prior_period_value":156.0,"visual_current_value":-86,"visual_prior_value":-156.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-804","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-876","text_snippet":"156","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-86,"prior_value":-156.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":6,"prior_period_value":6.0,"visual_current_value":-6,"visual_prior_value":-6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-813","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-885","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-6.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":413,"prior_period_value":574.0,"visual_current_value":-413,"visual_prior_value":-574.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-786","text_snippet":"413","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-849","text_snippet":"574","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-413,"prior_value":-574.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":65,"prior_period_value":90.0,"visual_current_value":-65,"visual_prior_value":-90.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-795","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-858","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-65,"prior_value":-90.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":850,"prior_period_value":1257.4,"visual_current_value":-850,"visual_prior_value":-1257.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-840","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-876","text_snippet":"1,257.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1257.4},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":33,"prior_period_value":53.8,"visual_current_value":-33,"visual_prior_value":-53.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-831","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-109","char_anchor":"f-867","text_snippet":"53.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-33,"prior_value":-53.8},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":247,"prior_period_value":376.9,"visual_current_value":-247,"visual_prior_value":-376.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-822","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-115","char_anchor":"f-858","text_snippet":"376.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-247,"prior_value":-376.9},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":86,"prior_period_value":155.3,"visual_current_value":-86,"visual_prior_value":-155.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-804","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-840","text_snippet":"155.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-86,"prior_value":-155.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":6,"prior_period_value":6.4,"visual_current_value":-6,"visual_prior_value":-6.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-813","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-849","text_snippet":"6.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-6.4},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":413,"prior_period_value":574.2,"visual_current_value":-413,"visual_prior_value":-574.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-786","text_snippet":"413","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-813","text_snippet":"574.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-413,"prior_value":-574.2},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract","order":1.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss","current_period_value":65,"prior_period_value":90.3,"visual_current_value":-65,"visual_prior_value":-90.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-795","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-113","char_anchor":"f-822","text_snippet":"90.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-65,"prior_value":-90.3},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":676,"prior_period_value":903.0,"visual_current_value":676,"visual_prior_value":903.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-838","text_snippet":"676","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-910","text_snippet":"903","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":676,"prior_value":903.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":50,"prior_period_value":80.0,"visual_current_value":50,"visual_prior_value":80.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-829","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-901","text_snippet":"80","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":50,"prior_value":80.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":138,"prior_period_value":177.0,"visual_current_value":138,"visual_prior_value":177.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-110","char_anchor":"f-820","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-114","char_anchor":"f-892","text_snippet":"177","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":138,"prior_value":177.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":138,"prior_period_value":224.0,"visual_current_value":138,"visual_prior_value":224.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-802","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-874","text_snippet":"224","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":138,"prior_value":224.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":28,"prior_period_value":33.0,"visual_current_value":28,"visual_prior_value":33.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-811","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-883","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":28,"prior_value":33.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":71,"prior_period_value":86.0,"visual_current_value":71,"visual_prior_value":86.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-108","char_anchor":"f-784","text_snippet":"71","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-111","char_anchor":"f-847","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"units","current_value":71,"prior_value":86.0},{"tag":"us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions","date_type":"Q","period_type":"instant","presentation_role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","presentation_hierarchy":[{"role":"investmentsgrossunrealizedlossesbymajorsecuritydetail","parent":"us-gaap:AvailableForsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions","current_period_value":251,"prior_period_value":302.0,"visual_current_value":251,"visual_prior_value":302.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-793","text_snippet":"251","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-112","char_anchor":"f-856","text_snippet":"302","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"units","current_value":251,"prior_value":302.0},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":1338,"prior_period_value":1009.0,"visual_current_value":1338,"visual_prior_value":1009.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-769","text_snippet":"1,338","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-770","text_snippet":"1,009","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1338,"prior_value":1009.0},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":0,"prior_period_value":3.0,"visual_current_value":0,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-766","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-106","char_anchor":"f-767","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":3.0},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":696,"prior_period_value":637.0,"visual_current_value":696,"visual_prior_value":637.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-760","text_snippet":"696","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-100","char_anchor":"f-761","text_snippet":"637","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":696,"prior_value":637.0},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":642,"prior_period_value":369.0,"visual_current_value":642,"visual_prior_value":369.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-102","char_anchor":"f-763","text_snippet":"642","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-764","text_snippet":"369","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":642,"prior_value":369.0},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":1338,"prior_period_value":1008.9,"visual_current_value":1338,"visual_prior_value":1008.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-769","text_snippet":"1,338","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-796","text_snippet":"1,008.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1338,"prior_value":1008.9},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":0,"prior_period_value":2.6,"visual_current_value":0,"visual_prior_value":2.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-766","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-109","char_anchor":"f-793","text_snippet":"2.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":2.6},{"tag":"us-gaap:HybridInstrumentsAtFairValueNet","date_type":"Q","period_type":"instant","presentation_role":"investmentshybridsecuritiesdetail","presentation_hierarchy":[{"role":"investmentshybridsecuritiesdetail","parent":"us-gaap:HybridInstrumentsLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Hybrid Instruments at Fair Value, Net","current_period_value":696,"prior_period_value":637.3,"visual_current_value":696,"visual_prior_value":637.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-760","text_snippet":"696","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-103","char_anchor":"f-787","text_snippet":"637.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":696,"prior_value":637.3},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":95.2,"prior_period_value":94.7,"visual_current_value":95.2,"visual_prior_value":94.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-555","text_snippet":"95.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-639","text_snippet":"94.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":95.2,"prior_value":94.7},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":6.7,"prior_period_value":8.3,"visual_current_value":6.7,"visual_prior_value":8.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-537","text_snippet":"6.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-83","char_anchor":"f-621","text_snippet":"8.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":6.7,"prior_value":8.3},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":6,"prior_period_value":5.4,"visual_current_value":6,"visual_prior_value":5.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-531","text_snippet":"6.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-82","char_anchor":"f-615","text_snippet":"5.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":6,"prior_value":5.4},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":19.9,"prior_period_value":18.9,"visual_current_value":19.9,"visual_prior_value":18.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-519","text_snippet":"19.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-603","text_snippet":"18.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":19.9,"prior_value":18.9},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-513","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-597","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":3.2,"prior_period_value":1.8,"visual_current_value":3.2,"visual_prior_value":1.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-525","text_snippet":"3.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-81","char_anchor":"f-609","text_snippet":"1.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":3.2,"prior_value":1.8},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":54.3,"prior_period_value":56.0,"visual_current_value":54.3,"visual_prior_value":56.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-501","text_snippet":"54.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-585","text_snippet":"56.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":54.3,"prior_value":56.0},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":3.5,"prior_period_value":3.3,"visual_current_value":3.5,"visual_prior_value":3.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-507","text_snippet":"3.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-591","text_snippet":"3.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":3.5,"prior_value":3.3},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":93.6,"prior_period_value":93.7,"visual_current_value":93.6,"visual_prior_value":93.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-543","text_snippet":"93.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-84","char_anchor":"f-627","text_snippet":"93.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":93.6,"prior_value":93.7},{"tag":"pgr:DebtSecuritiesAvailableforSalePercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":1.6,"prior_period_value":1.0,"visual_current_value":1.6,"visual_prior_value":1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-549","text_snippet":"1.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-85","char_anchor":"f-633","text_snippet":"1.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":1.6,"prior_value":1.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":13,"prior_period_value":2.0,"visual_current_value":13,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-553","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-637","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":13,"prior_value":2.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-535","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-83","char_anchor":"f-619","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-529","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-82","char_anchor":"f-613","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":12,"prior_period_value":0.0,"visual_current_value":12,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-517","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-601","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-511","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-595","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":1,"prior_period_value":2.0,"visual_current_value":1,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-523","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-81","char_anchor":"f-607","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":2.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-499","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-583","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-505","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-589","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":13,"prior_period_value":2.0,"visual_current_value":13,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-541","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-84","char_anchor":"f-625","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":13,"prior_value":2.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-547","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-85","char_anchor":"f-631","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":13,"prior_period_value":1.1,"visual_current_value":13,"visual_prior_value":1.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-553","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-580","text_snippet":"1.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":13,"prior_value":1.1},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":12,"prior_period_value":-0.9,"visual_current_value":12,"visual_prior_value":-0.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-517","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-73","char_anchor":"f-544","text_snippet":"0.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":-0.9},{"tag":"pgr:DebtSecuritiesAvailableforsaleAccumulatedGrossRealizedGainLossbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":13,"prior_period_value":1.1,"visual_current_value":13,"visual_prior_value":1.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-541","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-568","text_snippet":"1.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":13,"prior_value":1.1},{"tag":"pgr:EquitySecuritiesFVNIGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":3223,"prior_period_value":2739.0,"visual_current_value":3223,"visual_prior_value":2739.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-571","text_snippet":"3,223","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-655","text_snippet":"2,739","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3223,"prior_value":2739.0},{"tag":"pgr:EquitySecuritiesFVNIGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":3239,"prior_period_value":2764.0,"visual_current_value":3239,"visual_prior_value":2764.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-565","text_snippet":"3,239","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-87","char_anchor":"f-649","text_snippet":"2,764","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3239,"prior_value":2764.0},{"tag":"pgr:EquitySecuritiesFVNIGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":-16,"prior_period_value":-25.0,"visual_current_value":-16,"visual_prior_value":-25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-559","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-643","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-16,"prior_value":-25.0},{"tag":"pgr:EquitySecuritiesFVNIGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":3223,"prior_period_value":2738.8,"visual_current_value":3223,"visual_prior_value":2738.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-571","text_snippet":"3,223","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-598","text_snippet":"2,738.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3223,"prior_value":2738.8},{"tag":"pgr:EquitySecuritiesFVNIGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":3239,"prior_period_value":2763.5,"visual_current_value":3239,"visual_prior_value":2763.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-565","text_snippet":"3,239","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-592","text_snippet":"2,763.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3239,"prior_value":2763.5},{"tag":"pgr:EquitySecuritiesFVNIGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":-16,"prior_period_value":-24.7,"visual_current_value":-16,"visual_prior_value":-24.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-559","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-586","text_snippet":"24.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-16,"prior_value":-24.7},{"tag":"pgr:EquitySecuritiesFVNIGrossUnrealizedGainsbeforeTaxes","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Unrealized Gains","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-569","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-653","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:EquitySecuritiesFVNIGrossUnrealizedGainsbeforeTaxes","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Unrealized Gains","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-563","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-87","char_anchor":"f-647","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:EquitySecuritiesFVNIGrossUnrealizedGainsbeforeTaxes","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Unrealized Gains","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-557","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-641","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:EquitySecuritiesFVNIGrossUnrealizedLossesbeforeTaxes","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Gross Unrealized Losses, before Taxes","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-570","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-654","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"pgr:EquitySecuritiesFVNIGrossUnrealizedLossesbeforeTaxes","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Gross Unrealized Losses, before Taxes","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-564","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-87","char_anchor":"f-648","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"pgr:EquitySecuritiesFVNIGrossUnrealizedLossesbeforeTaxes","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFvNiCost","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:EquitySecuritiesFvNiCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Gross Unrealized Losses, before Taxes","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-558","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-642","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"pgr:EquitySecuritiesFVNIPercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":4.8,"prior_period_value":5.3,"visual_current_value":4.8,"visual_prior_value":5.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-573","text_snippet":"4.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-657","text_snippet":"5.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":4.8,"prior_value":5.3},{"tag":"pgr:EquitySecuritiesFVNIPercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":4.3,"prior_period_value":4.4,"visual_current_value":4.3,"visual_prior_value":4.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-567","text_snippet":"4.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-87","char_anchor":"f-651","text_snippet":"4.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":4.3,"prior_value":4.4},{"tag":"pgr:EquitySecuritiesFVNIPercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":0.5,"prior_period_value":0.9,"visual_current_value":0.5,"visual_prior_value":0.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-561","text_snippet":"0.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-645","text_snippet":"0.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":0.5,"prior_value":0.9},{"tag":"pgr:InvestmentsAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Unrealized Gains","current_period_value":1099,"prior_period_value":1072.0,"visual_current_value":1099,"visual_prior_value":1072.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-575","text_snippet":"1,099","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-659","text_snippet":"1,072","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1099,"prior_value":1072.0},{"tag":"pgr:InvestmentsAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Gross Unrealized Gains","current_period_value":1099,"prior_period_value":1072.3,"visual_current_value":1099,"visual_prior_value":1072.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-575","text_snippet":"1,099","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-602","text_snippet":"1,072.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1099,"prior_value":1072.3},{"tag":"pgr:InvestmentsAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investments, Accumulated Gross Unrealized Loss, Before Tax","current_period_value":850,"prior_period_value":1258.0,"visual_current_value":-850,"visual_prior_value":-1258.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-576","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-660","text_snippet":"1,258","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1258.0},{"tag":"pgr:InvestmentsAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investments, Accumulated Gross Unrealized Loss, Before Tax","current_period_value":850,"prior_period_value":1257.4,"visual_current_value":-850,"visual_prior_value":-1257.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-576","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-603","text_snippet":"1,257.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1257.4},{"tag":"pgr:InvestmentsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Amortized Cost","current_period_value":91024,"prior_period_value":76845.0,"visual_current_value":91024,"visual_prior_value":76845.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-574","text_snippet":"91,024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-658","text_snippet":"76,845","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":91024,"prior_value":76845.0},{"tag":"pgr:InvestmentsAmortizedCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Investments, Amortized Cost","current_period_value":91024,"prior_period_value":76844.9,"visual_current_value":91024,"visual_prior_value":76844.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-574","text_snippet":"91,024","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-601","text_snippet":"76,844.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":91024,"prior_value":76844.9},{"tag":"pgr:InvestmentsGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":3236,"prior_period_value":2741.0,"visual_current_value":3236,"visual_prior_value":2741.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-577","text_snippet":"3,236","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-661","text_snippet":"2,741","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3236,"prior_value":2741.0},{"tag":"pgr:InvestmentsGrossRealizedGainsLossesbeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:InvestmentsAmortizedCost","weight":-1.0,"order":3.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"pgr:InvestmentsAmortizedCost","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Net Holding Period Gains (Losses)","current_period_value":3236,"prior_period_value":2739.9,"visual_current_value":3236,"visual_prior_value":2739.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-577","text_snippet":"3,236","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-604","text_snippet":"2,739.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3236,"prior_value":2739.9},{"tag":"pgr:InvestmentsPercentOfTotalFairValue","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:InvestmentsAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"% of Total Fair Value","current_period_value":100,"prior_period_value":100.0,"visual_current_value":100,"visual_prior_value":100.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-579","text_snippet":"100.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-663","text_snippet":"100.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":100,"prior_value":100.0},{"tag":"pgr:SecuritiesHeldInConsolidatedNonInsuranceSubsidiary","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:ScheduleOfDebtAndEquitySecuritiesLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Total fair value of non-insurance subsidiary portfolio","current_period_value":4.9,"prior_period_value":4.1,"visual_current_value":4.9,"visual_prior_value":4.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-751","text_snippet":"4.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-752","text_snippet":"4.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"billions","current_value":4.9,"prior_value":4.1},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":1099,"prior_period_value":1072.0,"visual_current_value":1099,"visual_prior_value":1072.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-551","text_snippet":"1,099","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-635","text_snippet":"1,072","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1099,"prior_value":1072.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":35,"prior_period_value":40.0,"visual_current_value":35,"visual_prior_value":40.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-533","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-83","char_anchor":"f-617","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":40.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":17,"prior_period_value":4.0,"visual_current_value":17,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-527","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-82","char_anchor":"f-611","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17,"prior_value":4.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":270,"prior_period_value":222.0,"visual_current_value":270,"visual_prior_value":222.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-515","text_snippet":"270","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-599","text_snippet":"222","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":270,"prior_value":222.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-509","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-593","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":26,"prior_period_value":24.0,"visual_current_value":26,"visual_prior_value":24.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-521","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-81","char_anchor":"f-605","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":26,"prior_value":24.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":731,"prior_period_value":772.0,"visual_current_value":731,"visual_prior_value":772.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-497","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-581","text_snippet":"772","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":731,"prior_value":772.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":20,"prior_period_value":10.0,"visual_current_value":20,"visual_prior_value":10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-503","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-587","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":20,"prior_value":10.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":1099,"prior_period_value":1072.0,"visual_current_value":1099,"visual_prior_value":1072.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-539","text_snippet":"1,099","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-84","char_anchor":"f-623","text_snippet":"1,072","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1099,"prior_value":1072.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-545","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-85","char_anchor":"f-629","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":1099,"prior_period_value":1072.3,"visual_current_value":1099,"visual_prior_value":1072.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-551","text_snippet":"1,099","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-578","text_snippet":"1,072.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1099,"prior_value":1072.3},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":35,"prior_period_value":39.4,"visual_current_value":35,"visual_prior_value":39.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-533","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-76","char_anchor":"f-560","text_snippet":"39.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":39.4},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":17,"prior_period_value":4.1,"visual_current_value":17,"visual_prior_value":4.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-527","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-75","char_anchor":"f-554","text_snippet":"4.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":17,"prior_value":4.1},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":270,"prior_period_value":221.9,"visual_current_value":270,"visual_prior_value":221.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-515","text_snippet":"270","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-73","char_anchor":"f-542","text_snippet":"221.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":270,"prior_value":221.9},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":26,"prior_period_value":24.8,"visual_current_value":26,"visual_prior_value":24.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-521","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-74","char_anchor":"f-548","text_snippet":"24.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":26,"prior_value":24.8},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":731,"prior_period_value":771.4,"visual_current_value":731,"visual_prior_value":771.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-497","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-70","char_anchor":"f-524","text_snippet":"771.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":731,"prior_value":771.4},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":20,"prior_period_value":10.7,"visual_current_value":20,"visual_prior_value":10.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-503","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-71","char_anchor":"f-530","text_snippet":"10.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":20,"prior_value":10.7},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":-1.0,"order":1.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax","current_period_value":1099,"prior_period_value":1072.3,"visual_current_value":1099,"visual_prior_value":1072.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-539","text_snippet":"1,099","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-566","text_snippet":"1,072.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1099,"prior_value":1072.3},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":850,"prior_period_value":1258.0,"visual_current_value":-850,"visual_prior_value":-1258.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-552","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-636","text_snippet":"1,258","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1258.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":33,"prior_period_value":54.0,"visual_current_value":-33,"visual_prior_value":-54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-534","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-83","char_anchor":"f-618","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-33,"prior_value":-54.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":247,"prior_period_value":377.0,"visual_current_value":-247,"visual_prior_value":-377.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-528","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-82","char_anchor":"f-612","text_snippet":"377","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-247,"prior_value":-377.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":86,"prior_period_value":156.0,"visual_current_value":-86,"visual_prior_value":-156.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-516","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-600","text_snippet":"156","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-86,"prior_value":-156.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":0,"prior_period_value":1.0,"visual_current_value":0,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-510","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-594","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-1.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":6,"prior_period_value":6.0,"visual_current_value":-6,"visual_prior_value":-6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-522","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-81","char_anchor":"f-606","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-6.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":413,"prior_period_value":574.0,"visual_current_value":-413,"visual_prior_value":-574.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-498","text_snippet":"413","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-582","text_snippet":"574","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-413,"prior_value":-574.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":65,"prior_period_value":90.0,"visual_current_value":-65,"visual_prior_value":-90.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-504","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-588","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-65,"prior_value":-90.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":850,"prior_period_value":1258.0,"visual_current_value":-850,"visual_prior_value":-1258.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-540","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-84","char_anchor":"f-624","text_snippet":"1,258","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1258.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":-0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-546","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-85","char_anchor":"f-630","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":850,"prior_period_value":1257.4,"visual_current_value":-850,"visual_prior_value":-1257.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-552","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-579","text_snippet":"1,257.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1257.4},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":33,"prior_period_value":53.8,"visual_current_value":-33,"visual_prior_value":-53.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-534","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-76","char_anchor":"f-561","text_snippet":"53.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-33,"prior_value":-53.8},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":247,"prior_period_value":376.9,"visual_current_value":-247,"visual_prior_value":-376.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-528","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-75","char_anchor":"f-555","text_snippet":"376.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-247,"prior_value":-376.9},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":86,"prior_period_value":155.3,"visual_current_value":-86,"visual_prior_value":-155.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-516","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-73","char_anchor":"f-543","text_snippet":"155.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-86,"prior_value":-155.3},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":0,"prior_period_value":0.5,"visual_current_value":0,"visual_prior_value":-0.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-510","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-72","char_anchor":"f-537","text_snippet":"0.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.5},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":6,"prior_period_value":6.4,"visual_current_value":-6,"visual_prior_value":-6.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-522","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-74","char_anchor":"f-549","text_snippet":"6.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-6.4},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":413,"prior_period_value":574.2,"visual_current_value":-413,"visual_prior_value":-574.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-498","text_snippet":"413","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-70","char_anchor":"f-525","text_snippet":"574.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-413,"prior_value":-574.2},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":65,"prior_period_value":90.3,"visual_current_value":-65,"visual_prior_value":-90.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-504","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-71","char_anchor":"f-531","text_snippet":"90.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-65,"prior_value":-90.3},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","weight":1.0,"order":2.0}],"calculation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","calculation_parent":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax","current_period_value":850,"prior_period_value":1257.4,"visual_current_value":-850,"visual_prior_value":-1257.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-540","text_snippet":"850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-567","text_snippet":"1,257.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-850,"prior_value":-1257.4},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":89762,"prior_period_value":75352.0,"visual_current_value":89762,"visual_prior_value":75352.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-550","text_snippet":"89,762","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-634","text_snippet":"75,352","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":89762,"prior_value":75352.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":6374,"prior_period_value":6628.0,"visual_current_value":6374,"visual_prior_value":6628.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-532","text_snippet":"6,374","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-83","char_anchor":"f-616","text_snippet":"6,628","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6374,"prior_value":6628.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":5916,"prior_period_value":4664.0,"visual_current_value":5916,"visual_prior_value":4664.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-526","text_snippet":"5,916","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-82","char_anchor":"f-610","text_snippet":"4,664","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5916,"prior_value":4664.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":18621,"prior_period_value":14970.0,"visual_current_value":18621,"visual_prior_value":14970.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-514","text_snippet":"18,621","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-598","text_snippet":"14,970","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18621,"prior_value":14970.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":16,"prior_period_value":17.0,"visual_current_value":16,"visual_prior_value":17.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-508","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-592","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":17.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":2979,"prior_period_value":1404.0,"visual_current_value":2979,"visual_prior_value":1404.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-520","text_snippet":"2,979","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-81","char_anchor":"f-604","text_snippet":"1,404","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2979,"prior_value":1404.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":51021,"prior_period_value":44231.0,"visual_current_value":51021,"visual_prior_value":44231.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-496","text_snippet":"51,021","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-580","text_snippet":"44,231","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51021,"prior_value":44231.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":3320,"prior_period_value":2681.0,"visual_current_value":3320,"visual_prior_value":2681.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USStatesAndPoliticalSubdivisionsMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USStatesAndPoliticalSubdivisionsMember","member_label":"US States And Political Subdivisions"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-67","char_anchor":"f-502","text_snippet":"3,320","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-586","text_snippet":"2,681","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":3320,"prior_value":2681.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":88247,"prior_period_value":74595.0,"visual_current_value":88247,"visual_prior_value":74595.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-538","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-84","char_anchor":"f-622","text_snippet":"74,595","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":1515,"prior_period_value":757.0,"visual_current_value":1515,"visual_prior_value":757.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-544","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-85","char_anchor":"f-628","text_snippet":"757","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":757.0},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":89762,"prior_period_value":75351.7,"visual_current_value":89762,"visual_prior_value":75351.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-550","text_snippet":"89,762","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-577","text_snippet":"75,351.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":89762,"prior_value":75351.7},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":6374,"prior_period_value":6628.3,"visual_current_value":6374,"visual_prior_value":6628.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember","member_label":"Asset Backed Securities Securitized Loans And Receivables"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-72","char_anchor":"f-532","text_snippet":"6,374","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-76","char_anchor":"f-559","text_snippet":"6,628.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6374,"prior_value":6628.3},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":5916,"prior_period_value":4664.4,"visual_current_value":5916,"visual_prior_value":4664.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommercialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommercialMortgageBackedSecuritiesMember","member_label":"Commercial Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-71","char_anchor":"f-526","text_snippet":"5,916","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-75","char_anchor":"f-553","text_snippet":"4,664.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5916,"prior_value":4664.4},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":18621,"prior_period_value":14969.8,"visual_current_value":18621,"visual_prior_value":14969.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CorporateDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CorporateDebtSecuritiesMember","member_label":"Corporate Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-69","char_anchor":"f-514","text_snippet":"18,621","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-73","char_anchor":"f-541","text_snippet":"14,969.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":18621,"prior_value":14969.8},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":16,"prior_period_value":16.9,"visual_current_value":16,"visual_prior_value":16.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ForeignGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ForeignGovernmentDebtSecuritiesMember","member_label":"Foreign Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-68","char_anchor":"f-508","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-72","char_anchor":"f-535","text_snippet":"16.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":16,"prior_value":16.9},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":2979,"prior_period_value":1403.5,"visual_current_value":2979,"visual_prior_value":1403.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:ResidentialMortgageBackedSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:ResidentialMortgageBackedSecuritiesMember","member_label":"Residential Mortgage Backed Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-70","char_anchor":"f-520","text_snippet":"2,979","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-74","char_anchor":"f-547","text_snippet":"1,403.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2979,"prior_value":1403.5},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":51021,"prior_period_value":44231.3,"visual_current_value":51021,"visual_prior_value":44231.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:USGovernmentDebtSecuritiesMember|us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:USGovernmentDebtSecuritiesMember","member_label":"US Government Debt Securities"},{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-66","char_anchor":"f-496","text_snippet":"51,021","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-70","char_anchor":"f-523","text_snippet":"44,231.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":51021,"prior_value":44231.3},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":88247,"prior_period_value":74595.2,"visual_current_value":88247,"visual_prior_value":74595.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:FixedMaturitiesMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:FixedMaturitiesMember","member_label":"Fixed Maturities"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-73","char_anchor":"f-538","text_snippet":"88,247","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-77","char_anchor":"f-565","text_snippet":"74,595.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":88247,"prior_value":74595.2},{"tag":"us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:AvailableForSaleSecuritiesAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Securities, Available-for-Sale, Amortized Cost","current_period_value":1515,"prior_period_value":756.5,"visual_current_value":1515,"visual_prior_value":756.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:InformationByCategoryOfDebtSecurityAxis=us-gaap:ShortTermInvestmentsMember","dimensions":[{"axis":"us-gaap:InformationByCategoryOfDebtSecurityAxis","axis_label":"Information By Category Of Debt Security","member":"us-gaap:ShortTermInvestmentsMember","member_label":"Short Term Investments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-74","char_anchor":"f-544","text_snippet":"1,515","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-78","char_anchor":"f-571","text_snippet":"756.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1515,"prior_value":756.5},{"tag":"us-gaap:EquitySecuritiesFvNiCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Cost","current_period_value":1262,"prior_period_value":1493.0,"visual_current_value":1262,"visual_prior_value":1493.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-568","text_snippet":"1,262","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-652","text_snippet":"1,493","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1262,"prior_value":1493.0},{"tag":"us-gaap:EquitySecuritiesFvNiCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Cost","current_period_value":808,"prior_period_value":733.0,"visual_current_value":808,"visual_prior_value":733.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-562","text_snippet":"808","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-87","char_anchor":"f-646","text_snippet":"733","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":808,"prior_value":733.0},{"tag":"us-gaap:EquitySecuritiesFvNiCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Cost","current_period_value":454,"prior_period_value":760.0,"visual_current_value":454,"visual_prior_value":760.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-556","text_snippet":"454","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-86","char_anchor":"f-640","text_snippet":"760","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":454,"prior_value":760.0},{"tag":"us-gaap:EquitySecuritiesFvNiCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Cost","current_period_value":1262,"prior_period_value":1493.2,"visual_current_value":1262,"visual_prior_value":1493.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-568","text_snippet":"1,262","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-595","text_snippet":"1,493.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1262,"prior_value":1493.2},{"tag":"us-gaap:EquitySecuritiesFvNiCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Cost","current_period_value":808,"prior_period_value":733.5,"visual_current_value":808,"visual_prior_value":733.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:CommonStockMember","member_label":"Common Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-76","char_anchor":"f-562","text_snippet":"808","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-80","char_anchor":"f-589","text_snippet":"733.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":808,"prior_value":733.5},{"tag":"us-gaap:EquitySecuritiesFvNiCost","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"us-gaap:EquitySecuritiesFVNIAbstract","order":1.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Equity Securities, FV-NI, Cost","current_period_value":454,"prior_period_value":759.7,"visual_current_value":454,"visual_prior_value":759.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FinancialInstrumentAxis=us-gaap:NonredeemablePreferredStockMember","dimensions":[{"axis":"us-gaap:FinancialInstrumentAxis","axis_label":"Financial Instrument","member":"us-gaap:NonredeemablePreferredStockMember","member_label":"Nonredeemable Preferred Stock"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-75","char_anchor":"f-556","text_snippet":"454","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-79","char_anchor":"f-583","text_snippet":"759.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":454,"prior_value":759.7},{"tag":"us-gaap:OtherPayablesToBrokerDealersAndClearingOrganizations","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:ScheduleOfDebtAndEquitySecuritiesLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Other Payable to Broker-Dealer and Clearing Organization","current_period_value":523,"prior_period_value":469.0,"visual_current_value":523,"visual_prior_value":469.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-748","text_snippet":"523","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-749","text_snippet":"469","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":523,"prior_value":469.0},{"tag":"us-gaap:OtherPayablesToBrokerDealersAndClearingOrganizations","date_type":"Q","period_type":"instant","presentation_role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","presentation_hierarchy":[{"role":"investmentsinvestmentportfoliobymajorsecuritytypedetail","parent":"pgr:ScheduleOfDebtAndEquitySecuritiesLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Other Payable to Broker-Dealer and Clearing Organization","current_period_value":523,"prior_period_value":468.5,"visual_current_value":523,"visual_prior_value":468.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-748","text_snippet":"523","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-775","text_snippet":"468.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":523,"prior_value":468.5},{"tag":"pgr:ReinsuranceRecoverableforUnpaidClaimsandClaimsAdjustmentsandLiabilityforUnpaidClaimsandClaimAdjustmentExpenseOtherReconcilingItem","date_type":"Q","period_type":"instant","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Less reinsurance recoverables on unpaid losses","current_period_value":3813,"prior_period_value":4546.0,"visual_current_value":3813,"visual_prior_value":4546.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1827","text_snippet":"3,813","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-1828","text_snippet":"4,546","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":3813,"prior_value":4546.0},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","weight":1.0,"order":1.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year","current_period_value":21904,"prior_period_value":19669.0,"visual_current_value":21904,"visual_prior_value":19669.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1819","text_snippet":"21,904","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1820","text_snippet":"19,669","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":21904,"prior_value":19669.0},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years","current_period_value":14228,"prior_period_value":12492.0,"visual_current_value":14228,"visual_prior_value":12492.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1821","text_snippet":"14,228","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1822","text_snippet":"12,492","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":14228,"prior_value":12492.0},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years","current_period_value":14228,"prior_period_value":12492.9,"visual_current_value":14228,"visual_prior_value":12492.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1821","text_snippet":"14,228","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1922","text_snippet":"12,492.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":14228,"prior_value":12492.9},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims","current_period_value":39854,"prior_period_value":36077.0,"visual_current_value":39854,"visual_prior_value":36077.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1817","text_snippet":"39,854","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1818","text_snippet":"36,077","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":39854,"prior_value":36077.0},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims","current_period_value":39854,"prior_period_value":36077.2,"visual_current_value":39854,"visual_prior_value":36077.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1817","text_snippet":"39,854","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1918","text_snippet":"36,077.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":39854,"prior_value":36077.2},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet","date_type":"Q","period_type":"instant","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract","order":3.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Net","current_period_value":38292,"prior_period_value":33516.0,"visual_current_value":38292,"visual_prior_value":33516.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1825","text_snippet":"38,292","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-1826","text_snippet":"33,516","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":38292,"prior_value":33516.0},{"tag":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet","date_type":"Q","period_type":"instant","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract","order":3.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Net","current_period_value":38292,"prior_period_value":33515.5,"visual_current_value":38292,"visual_prior_value":33515.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-1825","text_snippet":"38,292","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-1926","text_snippet":"33,515.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":38292,"prior_value":33515.5},{"tag":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid","current_period_value":36132,"prior_period_value":32161.0,"visual_current_value":36132,"visual_prior_value":32161.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1823","text_snippet":"36,132","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1824","text_snippet":"32,161","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":36132,"prior_value":32161.0},{"tag":"us-gaap:PaymentsForLossesAndLossAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid","current_period_value":36132,"prior_period_value":32161.9,"visual_current_value":36132,"visual_prior_value":32161.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1823","text_snippet":"36,132","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1924","text_snippet":"32,161.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":36132,"prior_value":32161.9},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":1.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Current Year Claims and Claims Adjustment Expense","current_period_value":40922,"prior_period_value":36276.0,"visual_current_value":40922,"visual_prior_value":36276.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1813","text_snippet":"40,922","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1814","text_snippet":"36,276","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":40922,"prior_value":36276.0},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":1.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Current Year Claims and Claims Adjustment Expense","current_period_value":40922,"prior_period_value":36276.6,"visual_current_value":40922,"visual_prior_value":36276.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1813","text_snippet":"40,922","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1914","text_snippet":"36,276.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":40922,"prior_value":36276.6},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-1068,"prior_period_value":-199.0,"visual_current_value":-1068,"visual_prior_value":-199.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1815","text_snippet":"1,068","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1816","text_snippet":"199","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1068,"prior_value":-199.0},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-910,"prior_period_value":-375.0,"visual_current_value":-910,"visual_prior_value":-375.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=pgr:PersonalAutoMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:PersonalAutoMember","member_label":"Personal auto business"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-508","char_anchor":"f-1835","text_snippet":"910","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-513","char_anchor":"f-1840","text_snippet":"375","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-910,"prior_value":-375.0},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-75,"prior_period_value":75.0,"visual_current_value":-75,"visual_prior_value":75.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=pgr:PersonalPropertyMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:PersonalPropertyMember","member_label":"Personal property"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-509","char_anchor":"f-1836","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-515","char_anchor":"f-1842","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-75,"prior_value":75.0},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-190,"prior_period_value":-160.0,"visual_current_value":-190,"visual_prior_value":-160.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:ShortdurationInsuranceContractsAccidentYearAxis=us-gaap:ShortDurationInsuranceContractAccidentYear2023Member","dimensions":[{"axis":"us-gaap:ShortdurationInsuranceContractsAccidentYearAxis","axis_label":"Shortduration Insurance Contracts Accident Year","member":"us-gaap:ShortDurationInsuranceContractAccidentYear2023Member","member_label":"Short Duration Insurance Contract Accident Year2023"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-507","char_anchor":"f-1834","text_snippet":"190","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-511","char_anchor":"f-1838","text_snippet":"160","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-190,"prior_value":-160.0},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-80,"prior_period_value":100.0,"visual_current_value":-80,"visual_prior_value":100.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-510","char_anchor":"f-1837","text_snippet":"80","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-516","char_anchor":"f-1843","text_snippet":"100","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-80,"prior_value":100.0},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-1068,"prior_period_value":-199.4,"visual_current_value":-1068,"visual_prior_value":-199.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1815","text_snippet":"1,068","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1916","text_snippet":"199.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1068,"prior_value":-199.4},{"tag":"us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail|lossandlossadjustmentexpensereservesdetails","presentation_hierarchy":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","weight":1.0,"order":2.0}],"calculation_role":"lossandlossadjustmentexpensereservesactivityinlossandlossadjustmentexpensereservesdetail","calculation_parent":"us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"lossandlossadjustmentexpensereservesdetails","parent":"us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Prior Year Claims and Claims Adjustment Expense","current_period_value":-660,"prior_period_value":null,"visual_current_value":-660,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:ShortdurationInsuranceContractsAccidentYearAxis=us-gaap:ShortDurationInsuranceContractAccidentYear2024Member","dimensions":[{"axis":"us-gaap:ShortdurationInsuranceContractsAccidentYearAxis","axis_label":"Shortduration Insurance Contracts Accident Year","member":"us-gaap:ShortDurationInsuranceContractAccidentYear2024Member","member_label":"Short Duration Insurance Contract Accident Year2024"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-506","char_anchor":"f-1833","text_snippet":"660","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":null},"collision_flag":0,"scale":"millions","current_value":-660,"prior_value":null},{"tag":"us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet","date_type":"Q","period_type":"instant","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementadditionalinformationdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementadditionalinformationdetail","parent":"us-gaap:EquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net","current_period_value":1,"prior_period_value":0.6,"visual_current_value":1,"visual_prior_value":0.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-2281","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-2352","text_snippet":"0.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.6},{"tag":"us-gaap:AociBeforeTaxAttributableToParent","date_type":"Q","period_type":"instant","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"AOCI before Tax, Attributable to Parent","current_period_value":231,"prior_period_value":-203.0,"visual_current_value":231,"visual_prior_value":-203.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-2143","text_snippet":"231","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-2185","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":231,"prior_value":-203.0},{"tag":"us-gaap:AociBeforeTaxAttributableToParent","date_type":"Q","period_type":"instant","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":1.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"AOCI before Tax, Attributable to Parent","current_period_value":231,"prior_period_value":-203.2,"visual_current_value":231,"visual_prior_value":-203.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-2143","text_snippet":"231","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-2184","text_snippet":"203.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":231,"prior_value":-203.2},{"tag":"us-gaap:AociTaxAttributableToParent","date_type":"Q","period_type":"instant","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":1.0,"preferred_label_role":"negatedPeriodStartLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"AOCI Tax, Attributable to Parent","current_period_value":42,"prior_period_value":-48.0,"visual_current_value":-42,"visual_prior_value":48.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-2144","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-7","char_anchor":"f-2186","text_snippet":"48","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-42,"prior_value":48.0},{"tag":"us-gaap:AociTaxAttributableToParent","date_type":"Q","period_type":"instant","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":1.0,"preferred_label_role":"negatedPeriodStartLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"AOCI Tax, Attributable to Parent","current_period_value":42,"prior_period_value":-48.8,"visual_current_value":-42,"visual_prior_value":48.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-6","char_anchor":"f-2144","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-6","char_anchor":"f-2185","text_snippet":"48.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-42,"prior_value":48.8},{"tag":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, before Reclassifications, before Tax, Attributable to Parent","current_period_value":362,"prior_period_value":2013.0,"visual_current_value":362,"visual_prior_value":2013.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2119","text_snippet":"362","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2161","text_snippet":"2,013","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":362,"prior_value":2013.0},{"tag":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, before Reclassifications, before Tax, Attributable to Parent","current_period_value":2028,"prior_period_value":1514.0,"visual_current_value":2028,"visual_prior_value":1514.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2203","text_snippet":"2,028","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2251","text_snippet":"1,514","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2028,"prior_value":1514.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":3.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax","current_period_value":76,"prior_period_value":423.0,"visual_current_value":-76,"visual_prior_value":-423.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2120","text_snippet":"76","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2162","text_snippet":"423","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-76,"prior_value":-423.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":3.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax","current_period_value":426,"prior_period_value":318.0,"visual_current_value":-426,"visual_prior_value":-318.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2204","text_snippet":"426","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2252","text_snippet":"318","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-426,"prior_value":-318.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":3.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax","current_period_value":426,"prior_period_value":317.7,"visual_current_value":-426,"visual_prior_value":-317.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2204","text_snippet":"426","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2263","text_snippet":"317.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-426,"prior_value":-317.7},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":286,"prior_period_value":1590.0,"visual_current_value":286,"visual_prior_value":1590.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2121","text_snippet":"286","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2163","text_snippet":"1,590","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":286,"prior_value":1590.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-554","char_anchor":"f-2123","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-563","char_anchor":"f-2165","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":286,"prior_period_value":1590.0,"visual_current_value":286,"visual_prior_value":1590.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-553","char_anchor":"f-2122","text_snippet":"286","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-562","char_anchor":"f-2164","text_snippet":"1,590","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":286,"prior_value":1590.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-555","char_anchor":"f-2124","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-564","char_anchor":"f-2166","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":1602,"prior_period_value":1196.0,"visual_current_value":1602,"visual_prior_value":1196.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2205","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2253","text_snippet":"1,196","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2207","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-578","char_anchor":"f-2255","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":1602,"prior_period_value":1196.0,"visual_current_value":1602,"visual_prior_value":1196.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2206","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-577","char_anchor":"f-2254","text_snippet":"1,196","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2208","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-579","char_anchor":"f-2256","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":1602,"prior_period_value":1196.3,"visual_current_value":1602,"visual_prior_value":1196.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2205","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2264","text_snippet":"1,196.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":1602,"prior_period_value":1196.4,"visual_current_value":1602,"visual_prior_value":1196.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2206","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-643","char_anchor":"f-2265","text_snippet":"1,196.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.4},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Reclassifications, Net of Tax","current_period_value":0,"prior_period_value":-0.1,"visual_current_value":0,"visual_prior_value":-0.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2208","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-645","char_anchor":"f-2267","text_snippet":"0.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.1},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent","current_period_value":359,"prior_period_value":1977.0,"visual_current_value":359,"visual_prior_value":1977.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2137","text_snippet":"359","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2179","text_snippet":"1,977","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":359,"prior_value":1977.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent","current_period_value":2040,"prior_period_value":1850.0,"visual_current_value":2040,"visual_prior_value":1850.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2227","text_snippet":"2,040","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2269","text_snippet":"1,850","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2040,"prior_value":1850.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent","current_period_value":2040,"prior_period_value":1849.7,"visual_current_value":2040,"visual_prior_value":1849.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2227","text_snippet":"2,040","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2286","text_snippet":"1,849.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2040,"prior_value":1849.7},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax","current_period_value":-1,"prior_period_value":-0.3,"visual_current_value":-1,"visual_prior_value":-0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2217","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2276","text_snippet":"0.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax","current_period_value":-1,"prior_period_value":-0.3,"visual_current_value":-1,"visual_prior_value":-0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2219","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-644","char_anchor":"f-2278","text_snippet":"0.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2218","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-643","char_anchor":"f-2277","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2220","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-645","char_anchor":"f-2279","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax","current_period_value":-1,"prior_period_value":-0.4,"visual_current_value":-1,"visual_prior_value":-0.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2215","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2274","text_snippet":"0.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.4},{"tag":"us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":6.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax","current_period_value":0,"prior_period_value":-0.1,"visual_current_value":0,"visual_prior_value":0.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2216","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2275","text_snippet":"0.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.1},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":284,"prior_period_value":1561.0,"visual_current_value":284,"visual_prior_value":1561.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2139","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2181","text_snippet":"1,561","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":284,"prior_value":1561.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-554","char_anchor":"f-2141","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-563","char_anchor":"f-2183","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":284,"prior_period_value":1561.0,"visual_current_value":284,"visual_prior_value":1561.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-553","char_anchor":"f-2140","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-562","char_anchor":"f-2182","text_snippet":"1,561","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":284,"prior_value":1561.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-555","char_anchor":"f-2142","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-564","char_anchor":"f-2184","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":1612,"prior_period_value":1461.0,"visual_current_value":1612,"visual_prior_value":1461.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2229","text_snippet":"1,612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2271","text_snippet":"1,461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1612,"prior_value":1461.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":1,"prior_period_value":0.0,"visual_current_value":1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2231","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-578","char_anchor":"f-2273","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":1611,"prior_period_value":1461.0,"visual_current_value":1611,"visual_prior_value":1461.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2230","text_snippet":"1,611","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-577","char_anchor":"f-2272","text_snippet":"1,461","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1611,"prior_value":1461.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2232","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-579","char_anchor":"f-2274","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":1612,"prior_period_value":1461.3,"visual_current_value":1612,"visual_prior_value":1461.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2229","text_snippet":"1,612","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2288","text_snippet":"1,461.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1612,"prior_value":1461.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":1,"prior_period_value":0.3,"visual_current_value":1,"visual_prior_value":0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2231","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-644","char_anchor":"f-2290","text_snippet":"0.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":1611,"prior_period_value":1461.1,"visual_current_value":1611,"visual_prior_value":1461.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2230","text_snippet":"1,611","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-643","char_anchor":"f-2289","text_snippet":"1,461.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1611,"prior_value":1461.1},{"tag":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent","current_period_value":0,"prior_period_value":-0.1,"visual_current_value":0,"visual_prior_value":-0.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2232","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-645","char_anchor":"f-2291","text_snippet":"0.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-0.1},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax","current_period_value":3,"prior_period_value":36.0,"visual_current_value":3,"visual_prior_value":36.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2125","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2167","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":36.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax","current_period_value":-11,"prior_period_value":-336.0,"visual_current_value":-11,"visual_prior_value":-336.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2209","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2257","text_snippet":"336","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-11,"prior_value":-336.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax","current_period_value":-11,"prior_period_value":-335.3,"visual_current_value":-11,"visual_prior_value":-335.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2209","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2268","text_snippet":"335.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-11,"prior_value":-335.3},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":2,"prior_period_value":29.0,"visual_current_value":2,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2127","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2169","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":29.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-554","char_anchor":"f-2129","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-563","char_anchor":"f-2171","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":2,"prior_period_value":29.0,"visual_current_value":2,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-553","char_anchor":"f-2128","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-562","char_anchor":"f-2170","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":29.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-555","char_anchor":"f-2130","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-564","char_anchor":"f-2172","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":-9,"prior_period_value":-265.0,"visual_current_value":-9,"visual_prior_value":-265.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2211","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2259","text_snippet":"265","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-265.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2213","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-578","char_anchor":"f-2261","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":-9,"prior_period_value":-265.0,"visual_current_value":-9,"visual_prior_value":-265.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2212","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-577","char_anchor":"f-2260","text_snippet":"265","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-265.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2214","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-579","char_anchor":"f-2262","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":-9,"prior_period_value":-264.7,"visual_current_value":-9,"visual_prior_value":-264.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2211","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2270","text_snippet":"264.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-264.7},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","current_period_value":-9,"prior_period_value":-264.7,"visual_current_value":-9,"visual_prior_value":-264.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2212","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-643","char_anchor":"f-2271","text_snippet":"264.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-264.7},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAociCurrentPeriodTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAociCurrentPeriodTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax","current_period_value":1,"prior_period_value":7.0,"visual_current_value":-1,"visual_prior_value":-7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2126","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2168","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-7.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAociCurrentPeriodTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAociCurrentPeriodTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax","current_period_value":-2,"prior_period_value":-71.0,"visual_current_value":2,"visual_prior_value":71.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2210","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2258","text_snippet":"71","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":71.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:ReclassificationFromAociCurrentPeriodTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:ReclassificationFromAociCurrentPeriodTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax","current_period_value":-2,"prior_period_value":-70.6,"visual_current_value":2,"visual_prior_value":70.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2210","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2269","text_snippet":"70.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":70.6},{"tag":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":6.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent","current_period_value":75,"prior_period_value":416.0,"visual_current_value":-75,"visual_prior_value":-416.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2138","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2180","text_snippet":"416","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-75,"prior_value":-416.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":6.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent","current_period_value":428,"prior_period_value":389.0,"visual_current_value":-428,"visual_prior_value":-389.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2228","text_snippet":"428","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2270","text_snippet":"389","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-428,"prior_value":-389.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":6.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent","current_period_value":428,"prior_period_value":388.4,"visual_current_value":-428,"visual_prior_value":-388.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2228","text_snippet":"428","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2287","text_snippet":"388.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-428,"prior_value":-388.4},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax","current_period_value":362,"prior_period_value":2013.0,"visual_current_value":362,"visual_prior_value":2013.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2113","text_snippet":"362","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2155","text_snippet":"2,013","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":362,"prior_value":2013.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax","current_period_value":2028,"prior_period_value":1514.0,"visual_current_value":2028,"visual_prior_value":1514.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2197","text_snippet":"2,028","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2245","text_snippet":"1,514","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2028,"prior_value":1514.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax","current_period_value":2028,"prior_period_value":1514.2,"visual_current_value":2028,"visual_prior_value":1514.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2197","text_snippet":"2,028","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2250","text_snippet":"1,514.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2028,"prior_value":1514.2},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":286,"prior_period_value":1590.0,"visual_current_value":286,"visual_prior_value":1590.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2115","text_snippet":"286","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2157","text_snippet":"1,590","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":286,"prior_value":1590.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-554","char_anchor":"f-2117","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-563","char_anchor":"f-2159","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":286,"prior_period_value":1590.0,"visual_current_value":286,"visual_prior_value":1590.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-553","char_anchor":"f-2116","text_snippet":"286","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-562","char_anchor":"f-2158","text_snippet":"1,590","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":286,"prior_value":1590.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-555","char_anchor":"f-2118","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-564","char_anchor":"f-2160","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":1602,"prior_period_value":1196.0,"visual_current_value":1602,"visual_prior_value":1196.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2199","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2247","text_snippet":"1,196","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2201","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-578","char_anchor":"f-2249","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":1602,"prior_period_value":1196.0,"visual_current_value":1602,"visual_prior_value":1196.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2200","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-577","char_anchor":"f-2248","text_snippet":"1,196","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2202","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-579","char_anchor":"f-2250","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":1602,"prior_period_value":1196.4,"visual_current_value":1602,"visual_prior_value":1196.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2199","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2252","text_snippet":"1,196.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.4},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","current_period_value":1602,"prior_period_value":1196.4,"visual_current_value":1602,"visual_prior_value":1196.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2200","text_snippet":"1,602","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-643","char_anchor":"f-2253","text_snippet":"1,196.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1602,"prior_value":1196.4},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax","current_period_value":76,"prior_period_value":423.0,"visual_current_value":-76,"visual_prior_value":-423.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2114","text_snippet":"76","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2156","text_snippet":"423","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":-76,"prior_value":-423.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax","current_period_value":426,"prior_period_value":318.0,"visual_current_value":-426,"visual_prior_value":-318.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2198","text_snippet":"426","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2246","text_snippet":"318","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-426,"prior_value":-318.0},{"tag":"us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","weight":1.0,"order":1.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax","current_period_value":426,"prior_period_value":317.8,"visual_current_value":-426,"visual_prior_value":-317.8,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2198","text_snippet":"426","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2251","text_snippet":"317.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-426,"prior_value":-317.8},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax","current_period_value":3,"prior_period_value":36.0,"visual_current_value":3,"visual_prior_value":36.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2131","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2173","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":36.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax","current_period_value":-12,"prior_period_value":-336.0,"visual_current_value":-12,"visual_prior_value":-336.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2221","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2263","text_snippet":"336","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-12,"prior_value":-336.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossBeforeTax1RollForward","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax","current_period_value":-12,"prior_period_value":-335.7,"visual_current_value":-12,"visual_prior_value":-335.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2221","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2280","text_snippet":"335.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-12,"prior_value":-335.7},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":2,"prior_period_value":29.0,"visual_current_value":2,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2133","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2175","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":29.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-554","char_anchor":"f-2135","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-563","char_anchor":"f-2177","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":2,"prior_period_value":29.0,"visual_current_value":2,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-553","char_anchor":"f-2134","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-562","char_anchor":"f-2176","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":29.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-555","char_anchor":"f-2136","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-564","char_anchor":"f-2178","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":-10,"prior_period_value":-265.0,"visual_current_value":-10,"visual_prior_value":-265.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2223","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2265","text_snippet":"265","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-10,"prior_value":-265.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":-1,"prior_period_value":0.0,"visual_current_value":-1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2225","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-578","char_anchor":"f-2267","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":0.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":-9,"prior_period_value":-265.0,"visual_current_value":-9,"visual_prior_value":-265.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2224","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-577","char_anchor":"f-2266","text_snippet":"265","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-265.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedTranslationAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedTranslationAdjustmentMember","member_label":"Accumulated Translation Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-573","char_anchor":"f-2226","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-579","char_anchor":"f-2268","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":-1,"prior_period_value":-0.3,"visual_current_value":-1,"visual_prior_value":-0.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember","member_label":"Accumulated Gain Loss Net Cash Flow Hedge Parent"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-572","char_anchor":"f-2225","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-644","char_anchor":"f-2284","text_snippet":"0.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-0.3},{"tag":"us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossNetofTax1RollForward","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","current_period_value":-9,"prior_period_value":-264.7,"visual_current_value":-9,"visual_prior_value":-264.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember","member_label":"Accumulated Net Unrealized Investment Gain Loss"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-571","char_anchor":"f-2224","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-643","char_anchor":"f-2283","text_snippet":"264.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-264.7},{"tag":"us-gaap:ReclassificationFromAociCurrentPeriodTax","date_type":"Q","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":5.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from AOCI, Current Period, Tax","current_period_value":1,"prior_period_value":7.0,"visual_current_value":-1,"visual_prior_value":-7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-2132","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-2174","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-7.0},{"tag":"us-gaap:ReclassificationFromAociCurrentPeriodTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":5.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from AOCI, Current Period, Tax","current_period_value":-2,"prior_period_value":-71.0,"visual_current_value":2,"visual_prior_value":71.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2222","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2264","text_snippet":"71","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":71.0},{"tag":"us-gaap:ReclassificationFromAociCurrentPeriodTax","date_type":"YTD","period_type":"duration","presentation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","presentation_hierarchy":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"pgr:AccumulatedOtherComprehensiveIncomeLossTaxRollForward","order":5.0,"preferred_label_role":"negatedTotalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","weight":-1.0,"order":2.0}],"calculation_role":"othercomprehensiveincomelosscomponentsofothercomprehensiveincomelossincludingreclassificationadjustmentsbyincomestatementdetail","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Reclassification from AOCI, Current Period, Tax","current_period_value":-2,"prior_period_value":-70.7,"visual_current_value":2,"visual_prior_value":70.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2222","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-2281","text_snippet":"70.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":70.7},{"tag":"pgr:DistributionExpenses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":2821,"prior_period_value":2564.0,"visual_current_value":2821,"visual_prior_value":2564.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1893","text_snippet":"2,821","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1941","text_snippet":"2,564","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2821,"prior_value":2564.0},{"tag":"pgr:DistributionExpenses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":313,"prior_period_value":297.0,"visual_current_value":313,"visual_prior_value":297.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1891","text_snippet":"313","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1939","text_snippet":"297","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":313,"prior_value":297.0},{"tag":"pgr:DistributionExpenses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":1,"prior_period_value":0.0,"visual_current_value":1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1892","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1940","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.0},{"tag":"pgr:DistributionExpenses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":2507,"prior_period_value":2267.0,"visual_current_value":2507,"visual_prior_value":2267.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1890","text_snippet":"2,507","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1938","text_snippet":"2,267","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2507,"prior_value":2267.0},{"tag":"pgr:DistributionExpenses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":8092,"prior_period_value":6510.0,"visual_current_value":8092,"visual_prior_value":6510.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1989","text_snippet":"8,092","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2037","text_snippet":"6,510","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":8092,"prior_value":6510.0},{"tag":"pgr:DistributionExpenses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":907,"prior_period_value":855.0,"visual_current_value":907,"visual_prior_value":855.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1987","text_snippet":"907","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2035","text_snippet":"855","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":907,"prior_value":855.0},{"tag":"pgr:DistributionExpenses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":2,"prior_period_value":0.0,"visual_current_value":2,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1988","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2036","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":0.0},{"tag":"pgr:DistributionExpenses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Distribution expenses","current_period_value":7183,"prior_period_value":5655.0,"visual_current_value":7183,"visual_prior_value":5655.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1986","text_snippet":"7,183","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2034","text_snippet":"5,655","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":7183,"prior_value":5655.0},{"tag":"pgr:NonInsuranceServiceIncomeLossAdjusted","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,13.0,12],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Service businesses profit (loss)","current_period_value":-6,"prior_period_value":-9.0,"visual_current_value":-6,"visual_prior_value":-9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1907","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1955","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-9.0},{"tag":"pgr:NonInsuranceServiceIncomeLossAdjusted","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,13.0,12],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Service businesses profit (loss)","current_period_value":-18,"prior_period_value":-25.0,"visual_current_value":-18,"visual_prior_value":-25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2003","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2051","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-18,"prior_value":-25.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":2699,"prior_period_value":1496.0,"visual_current_value":2699,"visual_prior_value":1496.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1897","text_snippet":"2,699","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1945","text_snippet":"1,496","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2699,"prior_value":1496.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":300,"prior_period_value":248.0,"visual_current_value":300,"visual_prior_value":248.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1895","text_snippet":"300","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1943","text_snippet":"248","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":300,"prior_value":248.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":5,"prior_period_value":3.0,"visual_current_value":5,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1896","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1944","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":3.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":2394,"prior_period_value":1245.0,"visual_current_value":2394,"visual_prior_value":1245.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1894","text_snippet":"2,394","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1942","text_snippet":"1,245","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2394,"prior_value":1245.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":5803,"prior_period_value":4201.0,"visual_current_value":5803,"visual_prior_value":4201.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1993","text_snippet":"5,803","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2041","text_snippet":"4,201","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":5803,"prior_value":4201.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":823,"prior_period_value":726.0,"visual_current_value":823,"visual_prior_value":726.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1991","text_snippet":"823","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2039","text_snippet":"726","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":823,"prior_value":726.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":13,"prior_period_value":7.0,"visual_current_value":13,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1992","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2040","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":13,"prior_value":7.0},{"tag":"pgr:OtherUnderwritingExpenseAdjusted","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other underwriting expenses","current_period_value":4967,"prior_period_value":3468.0,"visual_current_value":4967,"visual_prior_value":3468.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1990","text_snippet":"4,967","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2038","text_snippet":"3,468","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4967,"prior_value":3468.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":11377,"prior_period_value":10120.0,"visual_current_value":11377,"visual_prior_value":10120.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1877","text_snippet":"11,377","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1925","text_snippet":"10,120","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":11377,"prior_value":10120.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":1575,"prior_period_value":1607.0,"visual_current_value":1575,"visual_prior_value":1607.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1875","text_snippet":"1,575","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1923","text_snippet":"1,607","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1575,"prior_value":1607.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":1,"prior_period_value":-1.0,"visual_current_value":1,"visual_prior_value":-1.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1876","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1924","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":-1.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":9801,"prior_period_value":8514.0,"visual_current_value":9801,"visual_prior_value":8514.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1874","text_snippet":"9,801","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1922","text_snippet":"8,514","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":9801,"prior_value":8514.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":33179,"prior_period_value":29002.0,"visual_current_value":33179,"visual_prior_value":29002.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1973","text_snippet":"33,179","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2021","text_snippet":"29,002","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":33179,"prior_value":29002.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":4695,"prior_period_value":4781.0,"visual_current_value":4695,"visual_prior_value":4781.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1971","text_snippet":"4,695","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2019","text_snippet":"4,781","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4695,"prior_value":4781.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":0,"prior_period_value":-4.0,"visual_current_value":0,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1972","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2020","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":-4.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredAdjustedToExcludeCatastropheLosses","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Losses (excluding catastrophe losses)","current_period_value":28484,"prior_period_value":24225.0,"visual_current_value":28484,"visual_prior_value":24225.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1970","text_snippet":"28,484","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2018","text_snippet":"24,225","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":28484,"prior_value":24225.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":219,"prior_period_value":732.0,"visual_current_value":219,"visual_prior_value":732.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1881","text_snippet":"219","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1929","text_snippet":"732","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":219,"prior_value":732.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":12,"prior_period_value":34.0,"visual_current_value":12,"visual_prior_value":34.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1879","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1927","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":34.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1880","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1928","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":207,"prior_period_value":698.0,"visual_current_value":207,"visual_prior_value":698.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1878","text_snippet":"207","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1926","text_snippet":"698","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":207,"prior_value":698.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":1385,"prior_period_value":2348.0,"visual_current_value":1385,"visual_prior_value":2348.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1977","text_snippet":"1,385","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2025","text_snippet":"2,348","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1385,"prior_value":2348.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":36,"prior_period_value":69.0,"visual_current_value":36,"visual_prior_value":69.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1975","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2023","text_snippet":"69","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":36,"prior_value":69.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1976","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2024","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredCatastropheLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Catastrophe losses","current_period_value":1349,"prior_period_value":2279.0,"visual_current_value":1349,"visual_prior_value":2279.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1974","text_snippet":"1,349","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2022","text_snippet":"2,279","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1349,"prior_value":2279.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":1849,"prior_period_value":1658.0,"visual_current_value":1849,"visual_prior_value":1658.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1885","text_snippet":"1,849","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1933","text_snippet":"1,658","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1849,"prior_value":1658.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":296,"prior_period_value":276.0,"visual_current_value":296,"visual_prior_value":276.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1883","text_snippet":"296","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1931","text_snippet":"276","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":296,"prior_value":276.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":-1,"prior_period_value":0.0,"visual_current_value":-1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1884","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1932","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":0.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":1554,"prior_period_value":1382.0,"visual_current_value":1554,"visual_prior_value":1382.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1882","text_snippet":"1,554","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1930","text_snippet":"1,382","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1554,"prior_value":1382.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":5290,"prior_period_value":4727.0,"visual_current_value":5290,"visual_prior_value":4727.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1981","text_snippet":"5,290","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2029","text_snippet":"4,727","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":5290,"prior_value":4727.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":875,"prior_period_value":824.0,"visual_current_value":875,"visual_prior_value":824.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1979","text_snippet":"875","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2027","text_snippet":"824","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":875,"prior_value":824.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1980","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2028","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:PolicyholderBenefitsAndClaimsIncurredLossAdjustmentExpense","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","weight":1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:PolicyholderBenefitsAndClaimsIncurredNet","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Loss adjustment expenses","current_period_value":4415,"prior_period_value":3903.0,"visual_current_value":4415,"visual_prior_value":3903.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1978","text_snippet":"4,415","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2026","text_snippet":"3,903","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4415,"prior_value":3903.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":21155,"prior_period_value":18575.0,"visual_current_value":21155,"visual_prior_value":18575.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1873","text_snippet":"21,155","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1921","text_snippet":"18,575","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":21155,"prior_value":18575.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":2794,"prior_period_value":2770.0,"visual_current_value":2794,"visual_prior_value":2770.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1871","text_snippet":"2,794","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1919","text_snippet":"2,770","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2794,"prior_value":2770.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":0,"prior_period_value":0.0,"visual_current_value":0,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1872","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1920","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":0,"prior_value":0.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":18361,"prior_period_value":15805.0,"visual_current_value":18361,"visual_prior_value":15805.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1870","text_snippet":"18,361","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1918","text_snippet":"15,805","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":18361,"prior_value":15805.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":61464,"prior_period_value":52429.0,"visual_current_value":61464,"visual_prior_value":52429.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1969","text_snippet":"61,464","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2017","text_snippet":"52,429","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":61464,"prior_value":52429.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":8336,"prior_period_value":8076.0,"visual_current_value":8336,"visual_prior_value":8076.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1967","text_snippet":"8,336","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2015","text_snippet":"8,076","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":8336,"prior_value":8076.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":1,"prior_period_value":0.0,"visual_current_value":1,"visual_prior_value":0.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1968","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2016","text_snippet":"0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":0.0},{"tag":"pgr:PremiumsEarnedFeesAndOtherRevenue","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Premiums Earned, Fees And Other Revenue","current_period_value":53127,"prior_period_value":44353.0,"visual_current_value":53127,"visual_prior_value":44353.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1966","text_snippet":"53,127","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2014","text_snippet":"44,353","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":53127,"prior_value":44353.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":2190,"prior_period_value":2005.0,"visual_current_value":2190,"visual_prior_value":2005.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1905","text_snippet":"2,190","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1953","text_snippet":"2,005","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":2190,"prior_value":2005.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":298,"prior_period_value":308.0,"visual_current_value":298,"visual_prior_value":308.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1903","text_snippet":"298","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1951","text_snippet":"308","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":298,"prior_value":308.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":-6,"prior_period_value":-2.0,"visual_current_value":-6,"visual_prior_value":-2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1904","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1952","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":-2.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":1898,"prior_period_value":1699.0,"visual_current_value":1898,"visual_prior_value":1699.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1902","text_snippet":"1,898","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1950","text_snippet":"1,699","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1898,"prior_value":1699.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":7715,"prior_period_value":5641.0,"visual_current_value":7715,"visual_prior_value":5641.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2001","text_snippet":"7,715","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2049","text_snippet":"5,641","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":7715,"prior_value":5641.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":1000,"prior_period_value":821.0,"visual_current_value":1000,"visual_prior_value":821.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1999","text_snippet":"1,000","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2047","text_snippet":"821","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1000,"prior_value":821.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":-14,"prior_period_value":-3.0,"visual_current_value":-14,"visual_prior_value":-3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-2000","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2048","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":-14,"prior_value":-3.0},{"tag":"pgr:PretaxUnderwritingProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,11.0,10],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Pretax underwriting profit (loss)","current_period_value":6729,"prior_period_value":4823.0,"visual_current_value":6729,"visual_prior_value":4823.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1998","text_snippet":"6,729","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2046","text_snippet":"4,823","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":6729,"prior_value":4823.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":5520,"prior_period_value":4060.0,"visual_current_value":5520,"visual_prior_value":4060.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1901","text_snippet":"5,520","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1949","text_snippet":"4,060","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":5520,"prior_value":4060.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":613,"prior_period_value":545.0,"visual_current_value":613,"visual_prior_value":545.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-1899","text_snippet":"613","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-1947","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":613,"prior_value":545.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":6,"prior_period_value":3.0,"visual_current_value":6,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-522","char_anchor":"f-1900","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-525","char_anchor":"f-1948","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":3.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":4901,"prior_period_value":3512.0,"visual_current_value":4901,"visual_prior_value":3512.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-1898","text_snippet":"4,901","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-1946","text_snippet":"3,512","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":4901,"prior_value":3512.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":13895,"prior_period_value":10711.0,"visual_current_value":13895,"visual_prior_value":10711.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1997","text_snippet":"13,895","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2045","text_snippet":"10,711","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":13895,"prior_value":10711.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":1730,"prior_period_value":1581.0,"visual_current_value":1730,"visual_prior_value":1581.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-1995","text_snippet":"1,730","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2043","text_snippet":"1,581","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1730,"prior_value":1581.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":15,"prior_period_value":7.0,"visual_current_value":15,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:OtherIndemnitySegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:OtherIndemnitySegmentMember","member_label":"Other Indemnity"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-528","char_anchor":"f-1996","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-531","char_anchor":"f-2044","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":15,"prior_value":7.0},{"tag":"us-gaap:ExpenseRelatedToDistributionOrServicingAndUnderwritingFees","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,5.0,4,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"pgr:PretaxUnderwritingProfitLoss","weight":-1.0,"order":3.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"pgr:PretaxUnderwritingProfitLoss","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Expense Related to Distribution or Servicing and Underwriting Fees","current_period_value":12150,"prior_period_value":9123.0,"visual_current_value":12150,"visual_prior_value":9123.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-1994","text_snippet":"12,150","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2042","text_snippet":"9,123","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":12150,"prior_value":9123.0},{"tag":"us-gaap:InvestmentIncomeNet","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investment Income, Net","current_period_value":1209,"prior_period_value":1020.0,"visual_current_value":1209,"visual_prior_value":1020.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-3","char_anchor":"f-1906","text_snippet":"1,209","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-4","char_anchor":"f-1954","text_snippet":"1,020","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":1209,"prior_value":1020.0},{"tag":"us-gaap:InvestmentIncomeNet","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationoperatingresultsdetail","presentation_hierarchy":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,12.0,11],"section_concept":null,"calculation_relationships":[{"role":"segmentinformationoperatingresultsdetail","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":2.0}],"calculation_role":"segmentinformationoperatingresultsdetail","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Investment Income, Net","current_period_value":3053,"prior_period_value":2339.0,"visual_current_value":3053,"visual_prior_value":2339.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-2002","text_snippet":"3,053","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-2050","text_snippet":"2,339","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"millions","current_value":3053,"prior_value":2339.0},{"tag":"pgr:UnderwritingMargin","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":10.8,"prior_period_value":11.3,"visual_current_value":10.8,"visual_prior_value":11.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-2065","text_snippet":"10.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-2067","text_snippet":"11.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":10.8,"prior_value":11.3},{"tag":"pgr:UnderwritingMargin","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":10.5,"prior_period_value":10.9,"visual_current_value":10.5,"visual_prior_value":10.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-2057","text_snippet":"10.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-2059","text_snippet":"10.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":10.5,"prior_value":10.9},{"tag":"pgr:UnderwritingMargin","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":10.5,"prior_period_value":11.0,"visual_current_value":10.5,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-534","char_anchor":"f-2073","text_snippet":"10.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-535","char_anchor":"f-2075","text_snippet":"11.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":10.5,"prior_value":11.0},{"tag":"pgr:UnderwritingMargin","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":12.2,"prior_period_value":10.3,"visual_current_value":12.2,"visual_prior_value":10.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-2069","text_snippet":"12.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2071","text_snippet":"10.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":12.2,"prior_value":10.3},{"tag":"pgr:UnderwritingMargin","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":12.9,"prior_period_value":11.0,"visual_current_value":12.9,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-2061","text_snippet":"12.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2063","text_snippet":"11.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":12.9,"prior_value":11.0},{"tag":"pgr:UnderwritingMargin","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":12.7,"prior_period_value":10.9,"visual_current_value":12.7,"visual_prior_value":10.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-536","char_anchor":"f-2077","text_snippet":"12.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-537","char_anchor":"f-2079","text_snippet":"10.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":12.7,"prior_value":10.9},{"tag":"pgr:UnderwritingMargin","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Under- writing Margin","current_period_value":12.9,"prior_period_value":12.3,"visual_current_value":12.9,"visual_prior_value":12.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-2061","text_snippet":"12.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-573","char_anchor":"f-2075","text_snippet":"12.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":12.9,"prior_value":12.3},{"tag":"us-gaap:CombinedRatio","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":89.2,"prior_period_value":88.7,"visual_current_value":89.2,"visual_prior_value":88.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-521","char_anchor":"f-2066","text_snippet":"89.2","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-524","char_anchor":"f-2068","text_snippet":"88.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":89.2,"prior_value":88.7},{"tag":"us-gaap:CombinedRatio","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":89.5,"prior_period_value":89.1,"visual_current_value":89.5,"visual_prior_value":89.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-520","char_anchor":"f-2058","text_snippet":"89.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-523","char_anchor":"f-2060","text_snippet":"89.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":89.5,"prior_value":89.1},{"tag":"us-gaap:CombinedRatio","date_type":"Q","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":89.5,"prior_period_value":89.0,"visual_current_value":89.5,"visual_prior_value":89.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-534","char_anchor":"f-2074","text_snippet":"89.5","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-535","char_anchor":"f-2076","text_snippet":"89.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":89.5,"prior_value":89.0},{"tag":"us-gaap:CombinedRatio","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":87.8,"prior_period_value":89.7,"visual_current_value":87.8,"visual_prior_value":89.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:CommercialLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:CommercialLinesSegmentMember","member_label":"Commercial Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-527","char_anchor":"f-2070","text_snippet":"87.8","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-530","char_anchor":"f-2072","text_snippet":"89.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":0,"scale":"hundredths","current_value":87.8,"prior_value":89.7},{"tag":"us-gaap:CombinedRatio","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":87.1,"prior_period_value":89.0,"visual_current_value":87.1,"visual_prior_value":89.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-2062","text_snippet":"87.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-529","char_anchor":"f-2064","text_snippet":"89.0","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":87.1,"prior_value":89.0},{"tag":"us-gaap:CombinedRatio","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":87.3,"prior_period_value":89.1,"visual_current_value":87.3,"visual_prior_value":89.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-536","char_anchor":"f-2078","text_snippet":"87.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-537","char_anchor":"f-2080","text_snippet":"89.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":87.3,"prior_value":89.1},{"tag":"us-gaap:CombinedRatio","date_type":"YTD","period_type":"duration","presentation_role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","presentation_hierarchy":[{"role":"segmentinformationunderwritingmarginsandcombinedratiosforourunderwritingoperationsdetail","parent":"us-gaap:SegmentReportingInformationLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Combined Ratio","current_period_value":87.1,"prior_period_value":87.7,"visual_current_value":87.1,"visual_prior_value":87.7,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=pgr:UnderwritingOperationsMember|us-gaap:StatementBusinessSegmentsAxis=pgr:PersonalLinesSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"pgr:UnderwritingOperationsMember","member_label":"Underwriting operations"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"pgr:PersonalLinesSegmentMember","member_label":"Personal Lines"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-526","char_anchor":"f-2062","text_snippet":"87.1","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-573","char_anchor":"f-2076","text_snippet":"87.7","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"hundredths","current_value":87.1,"prior_value":87.7},{"tag":"us-gaap:IncomeTaxesPaid","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Paid, before Refund Received","current_period_value":2313,"prior_period_value":1985.0,"visual_current_value":2313,"visual_prior_value":1985.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1854","text_snippet":"2,313","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1855","text_snippet":"1,985","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2313,"prior_value":1985.0},{"tag":"us-gaap:IncomeTaxesPaid","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Paid, before Refund Received","current_period_value":2313,"prior_period_value":1985.3,"visual_current_value":2313,"visual_prior_value":1985.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1854","text_snippet":"2,313","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1954","text_snippet":"1,985.3","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":2313,"prior_value":1985.3},{"tag":"us-gaap:InterestPaidNet","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Interest Paid, Excluding Capitalized Interest, Operating Activity","current_period_value":226,"prior_period_value":226.0,"visual_current_value":226,"visual_prior_value":226.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1856","text_snippet":"226","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1857","text_snippet":"226","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":226,"prior_value":226.0},{"tag":"us-gaap:InterestPaidNet","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Interest Paid, Excluding Capitalized Interest, Operating Activity","current_period_value":226,"prior_period_value":225.9,"visual_current_value":226,"visual_prior_value":225.9,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1856","text_snippet":"226","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1956","text_snippet":"225.9","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":226,"prior_value":225.9},{"tag":"us-gaap:OperatingLeasePayments","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Operating Lease, Payments","current_period_value":68,"prior_period_value":63.0,"visual_current_value":68,"visual_prior_value":63.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1858","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1859","text_snippet":"63","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":68,"prior_value":63.0},{"tag":"us-gaap:OperatingLeasePayments","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Operating Lease, Payments","current_period_value":68,"prior_period_value":63.4,"visual_current_value":68,"visual_prior_value":63.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1858","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1958","text_snippet":"63.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":68,"prior_value":63.4},{"tag":"us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Right-of-Use Asset Obtained in Exchange for Operating Lease Liability","current_period_value":83,"prior_period_value":74.0,"visual_current_value":83,"visual_prior_value":74.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1851","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-5","char_anchor":"f-1852","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":83,"prior_value":74.0},{"tag":"us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability","date_type":"YTD","period_type":"duration","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Right-of-Use Asset Obtained in Exchange for Operating Lease Liability","current_period_value":83,"prior_period_value":73.6,"visual_current_value":83,"visual_prior_value":73.6,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-1","char_anchor":"f-1851","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-1","char_anchor":"f-1951","text_snippet":"73.6","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":83,"prior_value":73.6},{"tag":"us-gaap:SecuritiesForReverseRepurchaseAgreements","date_type":"Q","period_type":"instant","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Securities for Reverse Repurchase Agreements","current_period_value":58,"prior_period_value":89.0,"visual_current_value":58,"visual_prior_value":89.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:BalanceSheetLocationAxis=us-gaap:CashAndCashEquivalentsMember","dimensions":[{"axis":"us-gaap:BalanceSheetLocationAxis","axis_label":"Balance Sheet Location","member":"us-gaap:CashAndCashEquivalentsMember","member_label":"Cash And Cash Equivalents"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-517","char_anchor":"f-1845","text_snippet":"58","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-518","char_anchor":"f-1846","text_snippet":"89","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":58,"prior_value":89.0},{"tag":"us-gaap:SecuritiesForReverseRepurchaseAgreements","date_type":"Q","period_type":"instant","presentation_role":"supplementalcashflowinformationdetail","presentation_hierarchy":[{"role":"supplementalcashflowinformationdetail","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Securities for Reverse Repurchase Agreements","current_period_value":58,"prior_period_value":89.4,"visual_current_value":58,"visual_prior_value":89.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:BalanceSheetLocationAxis=us-gaap:CashAndCashEquivalentsMember","dimensions":[{"axis":"us-gaap:BalanceSheetLocationAxis","axis_label":"Balance Sheet Location","member":"us-gaap:CashAndCashEquivalentsMember","member_label":"Cash And Cash Equivalents"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-517","char_anchor":"f-1845","text_snippet":"58","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"prior":{"context_ref":"c-560","char_anchor":"f-1945","text_snippet":"89.4","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066124000045/pgr-20240930.htm","accession":"0000080661-24-000045"}},"collision_flag":1,"scale":"millions","current_value":58,"prior_value":89.4}],"producer_parser_version":"854e467d","producer_source":"prewarm_sp500","_financials_schema_version":1,"cache_version":13,"semantic_status":"partial","coverage_status":"partial","scope_warnings":[{"type":"mixed_scope_cash_flow","scope_status":"mixed_scope_warning","statement_role":"cash_flow","affected_tags":["us-gaap:NetCashProvidedByUsedInOperatingActivities"],"message":"Operating cash flow is reported as consolidated cash flow while the filing also discloses discontinued operations or wind-down activity (Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current). Do not divide this consolidated CFO by continuing-operations revenue without an adjustment.","evidence":{"cash_flow_fact_source_ref":{"context_ref":"c-1","char_anchor":"f-430","text_snippet":"14,378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"disclosure_signal":{"tag":"us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent","concept_label":"Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current","axis_key":"__NONE__","dimensions":null}}}],"scope_bridges":[{"id":"cash_flow_scope_bridge:operating_cash_flow:2025-Q3:direct_discontinued","type":"cash_flow_scope_bridge","scope_status":"mixed_scope_bridge_candidate","statement_role":"cash_flow","base_concept":"operating_cash_flow","reported_scope":"consolidated","target_scope":"continuing_operations","reported_value":14378,"reported_scale":"millions","adjusted_value":0,"adjusted_scale":"millions","confidence":"high","adjustments":[{"label":"Reported discontinued-operations operating cash flow","operation":"remove_discontinued_operating_cash_flow","amount":14378,"scale":"millions","source_tag":"us-gaap:NetCashProvidedByUsedInOperatingActivities","statement_role":"cash_flow","reason":"The filing reports discontinued-operations cash flow directly.","source_ref":{"context_ref":"c-1","char_anchor":"f-430","text_snippet":"14,378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"}}],"evidence":{"reported_fact_source_ref":{"context_ref":"c-1","char_anchor":"f-430","text_snippet":"14,378","filing_url":"https://www.sec.gov/Archives/edgar/data/80661/000008066125000129/pgr-20250930.htm","accession":"0000080661-25-000129"},"disclosure_signal":{"tag":"us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent","concept_label":"Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current","axis_key":"__NONE__","dimensions":null}},"message":"Operating cash flow is consolidated while the filing discloses discontinued operations or wind-down activity. Use this bridge as an evidence-backed same-scope CFO candidate; do not overwrite the reported CFO fact.","ticker":"PGR","period":"2025-Q3"}]}