{"status":"success","metadata":{"ticker":"CMS","year":2025,"quarter":3,"full_year_mode":false,"total_facts":908,"prior_comparison_available":true,"source":{"filing_type":"10-Q","period_end":"September 30, 2025","url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077","value_scale":"millions"},"match_rate":{"quarterly":0.666289592760181,"ytd":0.627906976744186,"instants":1.0,"fallback":0.0},"final_match_rate":1.0,"match_diagnostics":{"quarterly":{"same_filing_q":{"current_count":884,"matched_count":589,"match_rate":0.666289592760181,"prior_count":718,"match_keys":["tag","date_type","axis_key"],"raw_current_row_count":986,"output_row_count":686,"current_duplicate_group_count":93,"prior_duplicate_group_count":89,"shared_key_count":589},"prior_year_ytd":{"current_count":344,"matched_count":216,"match_rate":0.627906976744186,"prior_count":243,"match_keys":["tag","date_type","axis_key"],"raw_current_row_count":344,"output_row_count":216},"prior_year_instant":{"current_count":291,"matched_count":291,"match_rate":1.0,"prior_count":269,"match_keys":["tag","end","date_type","presentation_role","axis_key"],"raw_current_row_count":291,"current_duplicate_group_count":17,"prior_duplicate_group_count":18,"current_only_count":76,"output_row_count":291},"fallback":{"current_count":13,"matched_count":0,"match_rate":0.0,"prior_count":12,"match_keys":["tag","end","date_type","axis_key"],"raw_current_row_count":13,"missing_tag_count":34,"output_row_count":0},"final":{"current_count":884,"matched_count":884,"match_rate":1.0,"raw_current_row_count":986,"output_row_count":1220,"current_only_added_count":27,"fallback_added_count":0,"overlap_prior_value_count":0}}}},"facts":[{"tag":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentNet","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:PropertyPlantAndEquipmentNet","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Property, Plant And Equipment, Net, Excluding C W I P","current_period_value":26532,"prior_period_value":24844.0,"visual_current_value":26532,"visual_prior_value":24844.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-292","text_snippet":"26,532","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-314","text_snippet":"24,844","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":26532,"prior_value":24844.0},{"tag":"us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment","current_period_value":10051,"prior_period_value":9312.0,"visual_current_value":10051,"visual_prior_value":9312.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-290","text_snippet":"10,051","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-312","text_snippet":"9,312","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":10051,"prior_value":9312.0},{"tag":"us-gaap:ConstructionInProgressGross","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentNet","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:PropertyPlantAndEquipmentNet","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Construction in Progress, Gross","current_period_value":3158,"prior_period_value":1827.0,"visual_current_value":3158,"visual_prior_value":1827.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-294","text_snippet":"3,158","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-316","text_snippet":"1,827","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3158,"prior_value":1827.0},{"tag":"us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures","current_period_value":64,"prior_period_value":null,"visual_current_value":64,"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-32","char_anchor":"f-302","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":64,"prior_value":null},{"tag":"us-gaap:MinorityInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,4.0,3],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Attributable to Noncontrolling Interest","current_period_value":567,"prior_period_value":530.0,"visual_current_value":567,"visual_prior_value":530.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-374","text_snippet":"567","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-396","text_snippet":"530","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":567,"prior_value":530.0},{"tag":"us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Accounts Receivable, Allowance for Credit Loss, Current","current_period_value":28,"prior_period_value":22.0,"visual_current_value":28,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-268","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-290","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":28,"prior_value":22.0},{"tag":"us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Accounts Receivable, Allowance for Credit Loss, Current","current_period_value":28,"prior_period_value":22.0,"visual_current_value":28,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-660","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-682","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":28,"prior_value":22.0},{"tag":"us-gaap:CommonStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Common Stock, Shares Authorized","current_period_value":350,"prior_period_value":350.0,"visual_current_value":350,"visual_prior_value":350.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-352","text_snippet":"350.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-375","text_snippet":"350.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":350,"prior_value":350.0},{"tag":"us-gaap:CommonStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Common Stock, Shares Authorized","current_period_value":125,"prior_period_value":125.0,"visual_current_value":125,"visual_prior_value":125.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-746","text_snippet":"125.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-768","text_snippet":"125.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":125,"prior_value":125.0},{"tag":"us-gaap:CommonStockSharesOutstanding","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Common Stock, Shares, Outstanding","current_period_value":304.3,"prior_period_value":298.8,"visual_current_value":304.3,"visual_prior_value":298.8,"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-32","char_anchor":"f-354","text_snippet":"304.3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-376","text_snippet":"298.8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":304.3,"prior_value":298.8},{"tag":"us-gaap:CommonStockSharesOutstanding","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Common Stock, Shares, Outstanding","current_period_value":84.1,"prior_period_value":84.1,"visual_current_value":84.1,"visual_prior_value":84.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-749","text_snippet":"84.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-771","text_snippet":"84.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":84.1,"prior_value":84.1},{"tag":"us-gaap:PreferredStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Preferred Stock, Shares Authorized","current_period_value":7.5,"prior_period_value":7.5,"visual_current_value":7.5,"visual_prior_value":7.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-762","text_snippet":"7.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-785","text_snippet":"7.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":7.5,"prior_value":7.5},{"tag":"us-gaap:PreferredStockSharesAuthorized","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","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":"Preferred Stock, Shares Authorized","current_period_value":9.2,"prior_period_value":null,"visual_current_value":9.2,"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-32","char_anchor":"f-367","text_snippet":"9.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":9.2,"prior_value":null},{"tag":"us-gaap:PreferredStockSharesOutstanding","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Shares Outstanding","current_period_value":0.4,"prior_period_value":0.4,"visual_current_value":0.4,"visual_prior_value":0.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-765","text_snippet":"0.4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-787","text_snippet":"0.4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":0.4,"prior_value":0.4},{"tag":"us-gaap:PreferredStockSharesOutstanding","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical|consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementOfFinancialPositionAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock, Shares Outstanding","current_period_value":9.2,"prior_period_value":null,"visual_current_value":9.2,"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-32","char_anchor":"f-369","text_snippet":"9.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":9.2,"prior_value":null},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":9431,"prior_period_value":8641.0,"visual_current_value":9431,"visual_prior_value":8641.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-376","text_snippet":"9,431","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-33","char_anchor":"f-477","text_snippet":"8,641","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":9431,"prior_value":8641.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":12324,"prior_period_value":10982.0,"visual_current_value":12324,"visual_prior_value":10982.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-840","text_snippet":"12,324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-106","char_anchor":"f-841","text_snippet":"10,982","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":12324,"prior_value":10982.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedOtherComprehensiveIncomeMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-137","char_anchor":"f-808","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-138","char_anchor":"f-809","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-11,"prior_value":-14.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":8869,"prior_period_value":7759.0,"visual_current_value":8869,"visual_prior_value":7759.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-127","char_anchor":"f-796","text_snippet":"8,869","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-128","char_anchor":"f-797","text_snippet":"7,759","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":8869,"prior_value":7759.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":841,"prior_period_value":841.0,"visual_current_value":841,"visual_prior_value":841.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:CommonStockMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-113","char_anchor":"f-776","text_snippet":"841","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-115","char_anchor":"f-778","text_snippet":"841","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":841,"prior_value":841.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":37,"prior_period_value":37.0,"visual_current_value":37,"visual_prior_value":37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:PreferredStockMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-150","char_anchor":"f-833","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-151","char_anchor":"f-834","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":37,"prior_value":37.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":2588,"prior_period_value":2359.0,"visual_current_value":2588,"visual_prior_value":2359.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-147","char_anchor":"f-828","text_snippet":"2,588","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-148","char_anchor":"f-829","text_snippet":"2,359","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2588,"prior_value":2359.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":-41,"prior_period_value":-45.0,"visual_current_value":-41,"visual_prior_value":-45.0,"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-64","char_anchor":"f-424","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-65","char_anchor":"f-425","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-41,"prior_value":-45.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":6355,"prior_period_value":6001.0,"visual_current_value":6355,"visual_prior_value":6001.0,"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-54","char_anchor":"f-408","text_snippet":"6,355","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-55","char_anchor":"f-409","text_snippet":"6,001","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6355,"prior_value":6001.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","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: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-41","char_anchor":"f-385","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-43","char_anchor":"f-387","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":567,"prior_period_value":530.0,"visual_current_value":567,"visual_prior_value":530.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:NoncontrollingInterestMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:NoncontrollingInterestMember","member_label":"Noncontrolling Interest"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-90","char_anchor":"f-472","text_snippet":"567","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-91","char_anchor":"f-473","text_snippet":"530","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":567,"prior_value":530.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":224,"prior_period_value":224.0,"visual_current_value":224,"visual_prior_value":224.0,"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-76","char_anchor":"f-448","text_snippet":"224","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-79","char_anchor":"f-451","text_snippet":"224","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":224,"prior_value":224.0},{"tag":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,5.0,4],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Including Portion Attributable to Noncontrolling Interest","current_period_value":2323,"prior_period_value":1928.0,"visual_current_value":2323,"visual_prior_value":1928.0,"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-74","char_anchor":"f-444","text_snippet":"2,323","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-75","char_anchor":"f-445","text_snippet":"1,928","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2323,"prior_value":1928.0},{"tag":"cms:AccountsReceivableAndAccruedRevenueAfterAllowanceForCreditLossCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Current Assets"}],"concept_label":"Accounts receivable and accrued revenue, less allowance of $28 in 2025 and $23 in 2024","current_period_value":890,"prior_period_value":763.0,"visual_current_value":890,"visual_prior_value":763.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-107","char_anchor":"f-662","text_snippet":"890","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-119","char_anchor":"f-684","text_snippet":"763","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":890,"prior_value":763.0},{"tag":"cms:AccountsReceivableAndAccruedRevenueAfterAllowanceForCreditLossCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Current Assets"}],"concept_label":"Accounts receivable and accrued revenue, less allowance of $28 in 2025 and $23 in 2024","current_period_value":922,"prior_period_value":794.0,"visual_current_value":922,"visual_prior_value":794.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-34","char_anchor":"f-270","text_snippet":"922","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-40","char_anchor":"f-292","text_snippet":"794","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":922,"prior_value":794.0},{"tag":"cms:AccruedRateRefunds","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,4.0,3],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,4.0,3],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Current Liabilities"}],"concept_label":"Accrued rate refunds","current_period_value":9,"prior_period_value":53.0,"visual_current_value":9,"visual_prior_value":53.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-320","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-342","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":53.0},{"tag":"cms:AccruedRateRefunds","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,4.0,3],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,4.0,3],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Current Liabilities"}],"concept_label":"Accrued rate refunds","current_period_value":9,"prior_period_value":53.0,"visual_current_value":9,"visual_prior_value":53.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-712","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-734","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":53.0},{"tag":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:Assets","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Assets, Noncurrent, Other than Property, Plant and Equipment","current_period_value":5573,"prior_period_value":5443.0,"visual_current_value":5573,"visual_prior_value":5443.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-308","text_snippet":"5,573","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-330","text_snippet":"5,443","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":5573,"prior_value":5443.0},{"tag":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:Assets","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Assets, Noncurrent, Other than Property, Plant and Equipment","current_period_value":5427,"prior_period_value":5298.0,"visual_current_value":5427,"visual_prior_value":5298.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-700","text_snippet":"5,427","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-722","text_snippet":"5,298","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":5427,"prior_value":5298.0},{"tag":"cms:CommonStockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Common Stockholders’ Equity","current_period_value":8640,"prior_period_value":7887.0,"visual_current_value":8640,"visual_prior_value":7887.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-364","text_snippet":"8,640","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-386","text_snippet":"7,887","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":8640,"prior_value":7887.0},{"tag":"cms:CommonStockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,5.0,4],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Common Stockholders’ Equity","current_period_value":12287,"prior_period_value":10945.0,"visual_current_value":12287,"visual_prior_value":10945.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-758","text_snippet":"12,287","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-780","text_snippet":"10,945","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":12287,"prior_value":10945.0},{"tag":"cms:DeferredPropertyTaxes","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,6.0,5],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,6.0,5],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":9.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":9.0,"section_label":"Current Assets"}],"concept_label":"Deferred property taxes","current_period_value":294,"prior_period_value":277.0,"visual_current_value":294,"visual_prior_value":277.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-280","text_snippet":"294","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-302","text_snippet":"277","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":294,"prior_value":277.0},{"tag":"cms:DeferredPropertyTaxes","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,6.0,5],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,6.0,5],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":9.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":9.0,"section_label":"Current Assets"}],"concept_label":"Deferred property taxes","current_period_value":294,"prior_period_value":277.0,"visual_current_value":294,"visual_prior_value":277.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-672","text_snippet":"294","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-694","text_snippet":"277","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":294,"prior_value":277.0},{"tag":"cms:LongTermDebtAndLeaseObligationCurrentExcludingNotesPayable","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,1.0,0],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,1.0,0],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Liabilities"}],"concept_label":"Current portion of long-term debt and finance leases","current_period_value":1162,"prior_period_value":507.0,"visual_current_value":1162,"visual_prior_value":507.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-312","text_snippet":"1,162","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-334","text_snippet":"507","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1162,"prior_value":507.0},{"tag":"cms:LongTermDebtAndLeaseObligationCurrentExcludingNotesPayable","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,1.0,0],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,1.0,0],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Liabilities"}],"concept_label":"Current portion of long-term debt and finance leases","current_period_value":579,"prior_period_value":507.0,"visual_current_value":579,"visual_prior_value":507.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-704","text_snippet":"579","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-726","text_snippet":"507","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":579,"prior_value":507.0},{"tag":"us-gaap:AccumulatedDeferredInvestmentTaxCredit","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,6.0,5],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,6.0,5],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Accumulated Deferred Investment Tax Credit","current_period_value":119,"prior_period_value":123.0,"visual_current_value":119,"visual_prior_value":123.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-342","text_snippet":"119","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-364","text_snippet":"123","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":119,"prior_value":123.0},{"tag":"us-gaap:AccumulatedDeferredInvestmentTaxCredit","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,6.0,5],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,6.0,5],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Accumulated Deferred Investment Tax Credit","current_period_value":119,"prior_period_value":123.0,"visual_current_value":119,"visual_prior_value":123.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-736","text_snippet":"119","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-758","text_snippet":"123","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":119,"prior_value":123.0},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","current_period_value":-41,"prior_period_value":-45.0,"visual_current_value":-41,"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-32","char_anchor":"f-360","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-382","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-41,"prior_value":-45.0},{"tag":"us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,3.0,2],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-754","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-776","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-11,"prior_value":-14.0},{"tag":"us-gaap:AdditionalPaidInCapitalCommonStock","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Additional Paid in Capital, Common Stock","current_period_value":6355,"prior_period_value":6001.0,"visual_current_value":6355,"visual_prior_value":6001.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-358","text_snippet":"6,355","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-380","text_snippet":"6,001","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6355,"prior_value":6001.0},{"tag":"us-gaap:AdditionalPaidInCapitalCommonStock","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,2.0,1],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Stockholders' Equity"}],"concept_label":"Additional Paid in Capital, Common Stock","current_period_value":8869,"prior_period_value":7759.0,"visual_current_value":8869,"visual_prior_value":7759.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-752","text_snippet":"8,869","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-774","text_snippet":"7,759","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":8869,"prior_value":7759.0},{"tag":"us-gaap:AssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,9.0,8],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,9.0,8],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Assets"}],"concept_label":"Assets, Current","current_period_value":2745,"prior_period_value":2703.0,"visual_current_value":2745,"visual_prior_value":2703.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-286","text_snippet":"2,745","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-308","text_snippet":"2,703","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2745,"prior_value":2703.0},{"tag":"us-gaap:AssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,9.0,8],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,9.0,8],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Assets"}],"concept_label":"Assets, Current","current_period_value":2572,"prior_period_value":2587.0,"visual_current_value":2572,"visual_prior_value":2587.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-678","text_snippet":"2,572","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-700","text_snippet":"2,587","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2572,"prior_value":2587.0},{"tag":"us-gaap:CommonStockValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Common Stock, Value, Issued","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":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-356","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-378","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:CommonStockValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,1.0,0],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Common Stock, Value, Issued","current_period_value":841,"prior_period_value":841.0,"visual_current_value":841,"visual_prior_value":841.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-750","text_snippet":"841","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-772","text_snippet":"841","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":841,"prior_value":841.0},{"tag":"us-gaap:DeferredIncomeTaxLiabilitiesNet","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,7.0,6],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,7.0,6],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Deferred Income Tax Liabilities, Net","current_period_value":3172,"prior_period_value":2837.0,"visual_current_value":3172,"visual_prior_value":2837.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-344","text_snippet":"3,172","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-366","text_snippet":"2,837","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3172,"prior_value":2837.0},{"tag":"us-gaap:DeferredIncomeTaxLiabilitiesNet","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,7.0,6],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,7.0,6],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Deferred Income Tax Liabilities, Net","current_period_value":3185,"prior_period_value":3002.0,"visual_current_value":3185,"visual_prior_value":3002.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-738","text_snippet":"3,185","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-760","text_snippet":"3,002","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3185,"prior_value":3002.0},{"tag":"us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Assets for Plan Benefits, Defined Benefit Plan","current_period_value":1744,"prior_period_value":1591.0,"visual_current_value":1744,"visual_prior_value":1591.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-304","text_snippet":"1,744","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-326","text_snippet":"1,591","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1744,"prior_value":1591.0},{"tag":"us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Assets for Plan Benefits, Defined Benefit Plan","current_period_value":1622,"prior_period_value":1481.0,"visual_current_value":1622,"visual_prior_value":1481.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-696","text_snippet":"1,622","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-718","text_snippet":"1,481","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1622,"prior_value":1481.0},{"tag":"us-gaap:EnergyRelatedInventoryGasStoredUnderground","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,5.0,4,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,5.0,4,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":10.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":10.0,"section_label":"Current Assets"}],"concept_label":"Energy Related Inventory, Gas Stored Underground","current_period_value":566,"prior_period_value":536.0,"visual_current_value":566,"visual_prior_value":536.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-274","text_snippet":"566","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-296","text_snippet":"536","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":566,"prior_value":536.0},{"tag":"us-gaap:EnergyRelatedInventoryGasStoredUnderground","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,5.0,4,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,5.0,4,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":10.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":10.0,"section_label":"Current Assets"}],"concept_label":"Energy Related Inventory, Gas Stored Underground","current_period_value":566,"prior_period_value":536.0,"visual_current_value":566,"visual_prior_value":536.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-666","text_snippet":"566","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-688","text_snippet":"536","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":566,"prior_value":536.0},{"tag":"us-gaap:EnergyRelatedInventoryOtherFossilFuel","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,5.0,4,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,5.0,4,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Assets"}],"concept_label":"Energy Related Inventory, Other Fossil Fuel","current_period_value":30,"prior_period_value":54.0,"visual_current_value":30,"visual_prior_value":54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-278","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-300","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":54.0},{"tag":"us-gaap:EnergyRelatedInventoryOtherFossilFuel","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,5.0,4,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,5.0,4,3.0,2],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Assets"}],"concept_label":"Energy Related Inventory, Other Fossil Fuel","current_period_value":28,"prior_period_value":51.0,"visual_current_value":28,"visual_prior_value":51.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-670","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-692","text_snippet":"51","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":28,"prior_value":51.0},{"tag":"us-gaap:InterestAndDividendsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,5.0,4],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,5.0,4],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Current Liabilities"}],"concept_label":"Interest and Dividends Payable, Current","current_period_value":204,"prior_period_value":161.0,"visual_current_value":204,"visual_prior_value":161.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-322","text_snippet":"204","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-344","text_snippet":"161","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":204,"prior_value":161.0},{"tag":"us-gaap:InterestAndDividendsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,5.0,4],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,5.0,4],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Current Liabilities"}],"concept_label":"Interest and Dividends Payable, Current","current_period_value":147,"prior_period_value":124.0,"visual_current_value":147,"visual_prior_value":124.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-714","text_snippet":"147","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-736","text_snippet":"124","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":147,"prior_value":124.0},{"tag":"us-gaap:LiabilitiesAndStockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","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":"Liabilities and Equity","current_period_value":38008,"prior_period_value":34817.0,"visual_current_value":38008,"visual_prior_value":34817.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-378","text_snippet":"38,008","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-400","text_snippet":"34,817","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":38008,"prior_value":34817.0},{"tag":"us-gaap:LiabilitiesAndStockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquityAbstract","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":"Liabilities and Equity","current_period_value":35780,"prior_period_value":33160.0,"visual_current_value":35780,"visual_prior_value":33160.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-770","text_snippet":"35,780","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-792","text_snippet":"33,160","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":35780,"prior_value":33160.0},{"tag":"us-gaap:LiabilitiesCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,9.0,8],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,9.0,8],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Current Liabilities"}],"concept_label":"Liabilities, Current","current_period_value":3052,"prior_period_value":2191.0,"visual_current_value":3052,"visual_prior_value":2191.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-330","text_snippet":"3,052","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-352","text_snippet":"2,191","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3052,"prior_value":2191.0},{"tag":"us-gaap:LiabilitiesCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,9.0,8],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,9.0,8],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Current Liabilities"}],"concept_label":"Liabilities, Current","current_period_value":2317,"prior_period_value":2074.0,"visual_current_value":2317,"visual_prior_value":2074.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-722","text_snippet":"2,317","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-744","text_snippet":"2,074","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2317,"prior_value":2074.0},{"tag":"us-gaap:LiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,9.0,8],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,9.0,8],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Liabilities, Noncurrent","current_period_value":25525,"prior_period_value":23985.0,"visual_current_value":25525,"visual_prior_value":23985.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-348","text_snippet":"25,525","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-370","text_snippet":"23,985","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":25525,"prior_value":23985.0},{"tag":"us-gaap:LiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,9.0,8],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":9.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,9.0,8],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesAndStockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesAndStockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Liabilities, Noncurrent","current_period_value":21139,"prior_period_value":20104.0,"visual_current_value":21139,"visual_prior_value":20104.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-742","text_snippet":"21,139","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-764","text_snippet":"20,104","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":21139,"prior_value":20104.0},{"tag":"us-gaap:LongTermAccountsNotesAndLoansReceivableNetNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent","current_period_value":18,"prior_period_value":20.0,"visual_current_value":18,"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-32","char_anchor":"f-300","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-322","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":18,"prior_value":20.0},{"tag":"us-gaap:LongTermAccountsNotesAndLoansReceivableNetNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent","current_period_value":88,"prior_period_value":93.0,"visual_current_value":88,"visual_prior_value":93.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-694","text_snippet":"88","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-121","char_anchor":"f-716","text_snippet":"93","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":88,"prior_value":93.0},{"tag":"us-gaap:LongTermDebtNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Long-Term Debt, Excluding Current Maturities","current_period_value":16774,"prior_period_value":15548.0,"visual_current_value":16774,"visual_prior_value":15548.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-332","text_snippet":"16,774","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-354","text_snippet":"15,548","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":16774,"prior_value":15548.0},{"tag":"us-gaap:LongTermDebtNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Long-Term Debt, Excluding Current Maturities","current_period_value":11537,"prior_period_value":10924.0,"visual_current_value":11537,"visual_prior_value":10924.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-107","char_anchor":"f-724","text_snippet":"11,537","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-119","char_anchor":"f-746","text_snippet":"10,924","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":11537,"prior_value":10924.0},{"tag":"us-gaap:LongTermDebtNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Long-Term Debt, Excluding Current Maturities","current_period_value":1005,"prior_period_value":731.0,"visual_current_value":1005,"visual_prior_value":731.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-726","text_snippet":"1,005","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-121","char_anchor":"f-748","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1005,"prior_value":731.0},{"tag":"us-gaap:OtherInventorySupplies","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,5.0,4,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,5.0,4,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Current Assets"}],"concept_label":"Other Inventory, Supplies, Gross","current_period_value":307,"prior_period_value":294.0,"visual_current_value":307,"visual_prior_value":294.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-276","text_snippet":"307","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-298","text_snippet":"294","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":307,"prior_value":294.0},{"tag":"us-gaap:OtherInventorySupplies","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,5.0,4,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:InventoryNetAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,5.0,4,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Current Assets"}],"concept_label":"Other Inventory, Supplies, Gross","current_period_value":299,"prior_period_value":286.0,"visual_current_value":299,"visual_prior_value":286.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-668","text_snippet":"299","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-690","text_snippet":"286","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":299,"prior_value":286.0},{"tag":"us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,4.0,3],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,4.0,3],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Liability, Defined Benefit Plan, Noncurrent","current_period_value":92,"prior_period_value":102.0,"visual_current_value":92,"visual_prior_value":102.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-338","text_snippet":"92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-360","text_snippet":"102","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":92,"prior_value":102.0},{"tag":"us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,4.0,3],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,4.0,3],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Liability, Defined Benefit Plan, Noncurrent","current_period_value":67,"prior_period_value":74.0,"visual_current_value":67,"visual_prior_value":74.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-732","text_snippet":"67","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-754","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":67,"prior_value":74.0},{"tag":"us-gaap:PreferredStockValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,2.0,1],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,2.0,1],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Preferred Stock, Value, Issued","current_period_value":224,"prior_period_value":224.0,"visual_current_value":224,"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-32","char_anchor":"f-370","text_snippet":"224","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-392","text_snippet":"224","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":224,"prior_value":224.0},{"tag":"us-gaap:PreferredStockValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,2.0,1],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,2.0,1],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquity","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquity","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Stockholders' Equity"}],"concept_label":"Preferred Stock, Value, Issued","current_period_value":37,"prior_period_value":37.0,"visual_current_value":37,"visual_prior_value":37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-766","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-788","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":37,"prior_value":37.0},{"tag":"us-gaap:RegulatoryAssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,7.0,6],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,7.0,6],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Current Assets"}],"concept_label":"Regulatory Asset, Current","current_period_value":84,"prior_period_value":180.0,"visual_current_value":84,"visual_prior_value":180.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-282","text_snippet":"84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-304","text_snippet":"180","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":84,"prior_value":180.0},{"tag":"us-gaap:RegulatoryAssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,7.0,6],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,7.0,6],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Current Assets"}],"concept_label":"Regulatory Asset, Current","current_period_value":84,"prior_period_value":180.0,"visual_current_value":84,"visual_prior_value":180.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-674","text_snippet":"84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-696","text_snippet":"180","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":84,"prior_value":180.0},{"tag":"us-gaap:RegulatoryLiabilityCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,7.0,6],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,7.0,6],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Current Liabilities"}],"concept_label":"Regulatory Liability, Current","current_period_value":89,"prior_period_value":120.0,"visual_current_value":89,"visual_prior_value":120.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-326","text_snippet":"89","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-348","text_snippet":"120","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":89,"prior_value":120.0},{"tag":"us-gaap:RegulatoryLiabilityCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,7.0,6],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,7.0,6],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Current Liabilities"}],"concept_label":"Regulatory Liability, Current","current_period_value":89,"prior_period_value":120.0,"visual_current_value":89,"visual_prior_value":120.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-718","text_snippet":"89","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-740","text_snippet":"120","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":89,"prior_value":120.0},{"tag":"us-gaap:RegulatoryLiabilityNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,3.0,2],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,3.0,2],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Regulatory Liability, Noncurrent","current_period_value":4104,"prior_period_value":4075.0,"visual_current_value":4104,"visual_prior_value":4075.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-336","text_snippet":"4,104","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-358","text_snippet":"4,075","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":4104,"prior_value":4075.0},{"tag":"us-gaap:RegulatoryLiabilityNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,3.0,2],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,3.0,2],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Non-Current Liabilities"}],"concept_label":"Regulatory Liability, Noncurrent","current_period_value":4104,"prior_period_value":4075.0,"visual_current_value":4104,"visual_prior_value":4075.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-730","text_snippet":"4,104","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-752","text_snippet":"4,075","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":4104,"prior_value":4075.0},{"tag":"us-gaap:RetainedEarningsAccumulatedDeficit","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,4.0,3],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,4.0,3],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Stockholders' Equity"}],"concept_label":"Retained Earnings (Accumulated Deficit)","current_period_value":2323,"prior_period_value":1928.0,"visual_current_value":2323,"visual_prior_value":1928.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-362","text_snippet":"2,323","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-384","text_snippet":"1,928","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2323,"prior_value":1928.0},{"tag":"us-gaap:RetainedEarningsAccumulatedDeficit","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,1.0,0,4.0,3],"section_concept":"us-gaap:StockholdersEquityAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,1.0,0,4.0,3],"section_concept":"us-gaap:StockholdersEquityAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:CommonStockholdersEquity","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:CommonStockholdersEquity","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Stockholders' Equity"}],"concept_label":"Retained Earnings (Accumulated Deficit)","current_period_value":2588,"prior_period_value":2359.0,"visual_current_value":2588,"visual_prior_value":2359.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-756","text_snippet":"2,588","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-778","text_snippet":"2,359","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2588,"prior_value":2359.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,3.0,2],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,3.0,2],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Attributable to Parent","current_period_value":8864,"prior_period_value":8111.0,"visual_current_value":8864,"visual_prior_value":8111.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-372","text_snippet":"8,864","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-394","text_snippet":"8,111","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":8864,"prior_value":8111.0},{"tag":"us-gaap:StockholdersEquity","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,4.0,3,3.0,2],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","section_label":"Stockholders' Equity"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3,3.0,2],"section_concept":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Stockholders' Equity"}],"concept_label":"Equity, Attributable to Parent","current_period_value":12324,"prior_period_value":10982.0,"visual_current_value":12324,"visual_prior_value":10982.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-768","text_snippet":"12,324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-790","text_snippet":"10,982","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":12324,"prior_value":10982.0},{"tag":"us-gaap:RegulatoryAssetsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null},{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Regulatory Asset, Noncurrent","current_period_value":3545,"prior_period_value":3560.0,"visual_current_value":3545,"visual_prior_value":3560.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-298","text_snippet":"3,545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-320","text_snippet":"3,560","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3545,"prior_value":3560.0},{"tag":"us-gaap:RegulatoryAssetsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null},{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Regulatory Asset, Noncurrent","current_period_value":3545,"prior_period_value":3560.0,"visual_current_value":3545,"visual_prior_value":3560.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-690","text_snippet":"3,545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-712","text_snippet":"3,560","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3545,"prior_value":3560.0},{"tag":"us-gaap:RegulatoryAssetsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,1.0,0],"section_concept":null,"section_label":null},{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Regulatory Asset, Noncurrent","current_period_value":85,"prior_period_value":93.0,"visual_current_value":85,"visual_prior_value":93.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RegulatoryAssetAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RegulatoryAssetAxis","axis_label":"Regulatory Asset","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-175","char_anchor":"f-892","text_snippet":"85","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-184","char_anchor":"f-911","text_snippet":"93","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":85,"prior_value":93.0},{"tag":"us-gaap:OtherLiabilitiesCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Liabilities"},{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringCostAndReserveLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Other Liabilities, Current","current_period_value":18,"prior_period_value":9.0,"visual_current_value":18,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-462","char_anchor":"f-2296","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-463","char_anchor":"f-2297","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":18,"prior_value":9.0},{"tag":"us-gaap:OtherLiabilitiesCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Liabilities"},{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringCostAndReserveLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Other Liabilities, Current","current_period_value":239,"prior_period_value":null,"visual_current_value":239,"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-32","char_anchor":"f-328","text_snippet":"239","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":239,"prior_value":null},{"tag":"us-gaap:OtherLiabilitiesCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Liabilities"},{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringCostAndReserveLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Other Liabilities, Current","current_period_value":204,"prior_period_value":null,"visual_current_value":204,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-720","text_snippet":"204","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":204,"prior_value":null},{"tag":"us-gaap:OtherLiabilitiesCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,8.0,7],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Liabilities"},{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringCostAndReserveLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Other Liabilities, Current","current_period_value":18,"prior_period_value":null,"visual_current_value":18,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-462","char_anchor":"f-2296","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":18,"prior_value":null},{"tag":"us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":4.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Assets"}],"concept_label":"Restricted Cash and Cash Equivalent, Current","current_period_value":70,"prior_period_value":55.0,"visual_current_value":70,"visual_prior_value":55.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-266","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-288","text_snippet":"55","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":70,"prior_value":55.0},{"tag":"us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":4.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Assets"}],"concept_label":"Restricted Cash and Cash Equivalent, Current","current_period_value":69,"prior_period_value":54.0,"visual_current_value":69,"visual_prior_value":54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-658","text_snippet":"69","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-680","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":69,"prior_value":54.0},{"tag":"us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":4.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Assets"}],"concept_label":"Restricted Cash and Cash Equivalent, Current","current_period_value":69,"prior_period_value":54.0,"visual_current_value":69,"visual_prior_value":54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-228","char_anchor":"f-1011","text_snippet":"69","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-223","char_anchor":"f-1003","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":69,"prior_value":54.0},{"tag":"us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":4.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":4.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,2.0,1],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Current Assets"}],"concept_label":"Restricted Cash and Cash Equivalent, Current","current_period_value":70,"prior_period_value":55.0,"visual_current_value":70,"visual_prior_value":55.0,"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-226","char_anchor":"f-1009","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-221","char_anchor":"f-1001","text_snippet":"55","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":70,"prior_value":55.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":38008,"prior_period_value":34817.0,"visual_current_value":38008,"visual_prior_value":34817.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-310","text_snippet":"38,008","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-33","char_anchor":"f-1822","text_snippet":"34,817","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":38008,"prior_value":34817.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":35780,"prior_period_value":33160.0,"visual_current_value":35780,"visual_prior_value":33160.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-702","text_snippet":"35,780","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-106","char_anchor":"f-1897","text_snippet":"33,160","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":35780,"prior_value":33160.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":46,"prior_period_value":29.0,"visual_current_value":46,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-400","char_anchor":"f-1719","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-418","char_anchor":"f-1896","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":46,"prior_value":29.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":35734,"prior_period_value":33131.0,"visual_current_value":35734,"visual_prior_value":33131.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1718","text_snippet":"35,734","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-417","char_anchor":"f-1895","text_snippet":"33,131","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":35734,"prior_value":33131.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":21972,"prior_period_value":20279.0,"visual_current_value":21972,"visual_prior_value":20279.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-397","char_anchor":"f-1716","text_snippet":"21,972","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-415","char_anchor":"f-1893","text_snippet":"20,279","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":21972,"prior_value":20279.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":13762,"prior_period_value":12852.0,"visual_current_value":13762,"visual_prior_value":12852.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-398","char_anchor":"f-1717","text_snippet":"13,762","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-416","char_anchor":"f-1894","text_snippet":"12,852","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":13762,"prior_value":12852.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":142,"prior_period_value":75.0,"visual_current_value":142,"visual_prior_value":75.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-394","char_anchor":"f-1644","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-412","char_anchor":"f-1821","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":142,"prior_value":75.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":37866,"prior_period_value":34742.0,"visual_current_value":37866,"visual_prior_value":34742.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-393","char_anchor":"f-1643","text_snippet":"37,866","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-411","char_anchor":"f-1820","text_snippet":"34,742","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":37866,"prior_value":34742.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":21917,"prior_period_value":20222.0,"visual_current_value":21917,"visual_prior_value":20222.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-390","char_anchor":"f-1640","text_snippet":"21,917","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-408","char_anchor":"f-1817","text_snippet":"20,222","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":21917,"prior_value":20222.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":13720,"prior_period_value":12809.0,"visual_current_value":13720,"visual_prior_value":12809.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-391","char_anchor":"f-1641","text_snippet":"13,720","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-409","char_anchor":"f-1818","text_snippet":"12,809","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":13720,"prior_value":12809.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":2229,"prior_period_value":1711.0,"visual_current_value":2229,"visual_prior_value":1711.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-392","char_anchor":"f-1642","text_snippet":"2,229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-410","char_anchor":"f-1819","text_snippet":"1,711","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2229,"prior_value":1711.0},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":38008,"prior_period_value":null,"visual_current_value":38008,"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-32","char_anchor":"f-310","text_snippet":"38,008","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":38008,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":35780,"prior_period_value":null,"visual_current_value":35780,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-702","text_snippet":"35,780","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":35780,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":21917,"prior_period_value":null,"visual_current_value":21917,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-390","char_anchor":"f-1640","text_snippet":"21,917","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":21917,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":13720,"prior_period_value":null,"visual_current_value":13720,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-391","char_anchor":"f-1641","text_snippet":"13,720","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":13720,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":2229,"prior_period_value":null,"visual_current_value":2229,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-392","char_anchor":"f-1642","text_snippet":"2,229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":2229,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":37866,"prior_period_value":null,"visual_current_value":37866,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-393","char_anchor":"f-1643","text_snippet":"37,866","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":37866,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":142,"prior_period_value":null,"visual_current_value":142,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-394","char_anchor":"f-1644","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":142,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":21972,"prior_period_value":null,"visual_current_value":21972,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-397","char_anchor":"f-1716","text_snippet":"21,972","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":21972,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":13762,"prior_period_value":null,"visual_current_value":13762,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-398","char_anchor":"f-1717","text_snippet":"13,762","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":13762,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":35734,"prior_period_value":null,"visual_current_value":35734,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1718","text_snippet":"35,734","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":35734,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":46,"prior_period_value":null,"visual_current_value":46,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-400","char_anchor":"f-1719","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":46,"prior_value":null},{"tag":"us-gaap:Assets","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,17.0,16],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Assets","current_period_value":1059,"prior_period_value":null,"visual_current_value":1059,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2254","text_snippet":"1,059","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":1059,"prior_value":null},{"tag":"us-gaap:AccountsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Accounts Payable, Current","current_period_value":984,"prior_period_value":901.0,"visual_current_value":984,"visual_prior_value":901.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-107","char_anchor":"f-708","text_snippet":"984","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-119","char_anchor":"f-730","text_snippet":"901","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":984,"prior_value":901.0},{"tag":"us-gaap:AccountsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Accounts Payable, Current","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-710","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-121","char_anchor":"f-732","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":15,"prior_value":13.0},{"tag":"us-gaap:AccountsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Accounts Payable, Current","current_period_value":9,"prior_period_value":8.0,"visual_current_value":9,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2256","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1649","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":8.0},{"tag":"us-gaap:AccountsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Accounts Payable, Current","current_period_value":1141,"prior_period_value":947.0,"visual_current_value":1141,"visual_prior_value":947.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-34","char_anchor":"f-316","text_snippet":"1,141","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-40","char_anchor":"f-338","text_snippet":"947","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1141,"prior_value":947.0},{"tag":"us-gaap:AccountsPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,3.0,2],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Accounts Payable, Current","current_period_value":8,"prior_period_value":7.0,"visual_current_value":8,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-36","char_anchor":"f-318","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-42","char_anchor":"f-340","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":7.0},{"tag":"us-gaap:AssetRetirementObligationsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,5.0,4],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,5.0,4],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":1.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Asset Retirement Obligations, Noncurrent","current_period_value":731,"prior_period_value":761.0,"visual_current_value":731,"visual_prior_value":761.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-340","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-362","text_snippet":"761","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":731,"prior_value":761.0},{"tag":"us-gaap:AssetRetirementObligationsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,5.0,4],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,5.0,4],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":1.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Asset Retirement Obligations, Noncurrent","current_period_value":696,"prior_period_value":727.0,"visual_current_value":696,"visual_prior_value":727.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-734","text_snippet":"696","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-756","text_snippet":"727","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":696,"prior_value":727.0},{"tag":"us-gaap:AssetRetirementObligationsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,5.0,4],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,5.0,4],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,10.0,9],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":1.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Asset Retirement Obligations, Noncurrent","current_period_value":35,"prior_period_value":33.0,"visual_current_value":35,"visual_prior_value":33.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2262","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1653","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":33.0},{"tag":"us-gaap:CashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Cash and Cash Equivalent","current_period_value":362,"prior_period_value":412.0,"visual_current_value":362,"visual_prior_value":412.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-264","text_snippet":"362","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-286","text_snippet":"412","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":362,"prior_value":412.0},{"tag":"us-gaap:CashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Cash and Cash Equivalent","current_period_value":242,"prior_period_value":349.0,"visual_current_value":242,"visual_prior_value":349.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-656","text_snippet":"242","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-678","text_snippet":"349","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":242,"prior_value":349.0},{"tag":"us-gaap:CashAndCashEquivalentsAtCarryingValue","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,1.0,0],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":1.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Cash and Cash Equivalent","current_period_value":19,"prior_period_value":24.0,"visual_current_value":19,"visual_prior_value":24.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2244","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1637","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":24.0},{"tag":"us-gaap:FinanceLeaseLiabilityNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":2.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Finance Lease, Liability, Noncurrent","current_period_value":137,"prior_period_value":112.0,"visual_current_value":137,"visual_prior_value":112.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-334","text_snippet":"137","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-356","text_snippet":"112","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":137,"prior_value":112.0},{"tag":"us-gaap:FinanceLeaseLiabilityNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":2.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Finance Lease, Liability, Noncurrent","current_period_value":84,"prior_period_value":70.0,"visual_current_value":84,"visual_prior_value":70.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-728","text_snippet":"84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-750","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":84,"prior_value":70.0},{"tag":"us-gaap:FinanceLeaseLiabilityNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,2.0,1],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":2.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Finance Lease, Liability, Noncurrent","current_period_value":24,"prior_period_value":23.0,"visual_current_value":24,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2260","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1651","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":24,"prior_value":23.0},{"tag":"us-gaap:OtherAssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,8.0,7],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,8.0,7],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Other Assets, Current","current_period_value":98,"prior_period_value":92.0,"visual_current_value":98,"visual_prior_value":92.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-284","text_snippet":"98","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-306","text_snippet":"92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":98,"prior_value":92.0},{"tag":"us-gaap:OtherAssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,8.0,7],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,8.0,7],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Other Assets, Current","current_period_value":90,"prior_period_value":80.0,"visual_current_value":90,"visual_prior_value":80.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-676","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-698","text_snippet":"80","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":90,"prior_value":80.0},{"tag":"us-gaap:OtherAssetsCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,8.0,7],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,8.0,7],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Other Assets, Current","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":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2248","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1641","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:OtherAssetsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Other Assets, Noncurrent","current_period_value":202,"prior_period_value":198.0,"visual_current_value":202,"visual_prior_value":198.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-306","text_snippet":"202","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-328","text_snippet":"198","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":202,"prior_value":198.0},{"tag":"us-gaap:OtherAssetsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Other Assets, Noncurrent","current_period_value":148,"prior_period_value":138.0,"visual_current_value":148,"visual_prior_value":138.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-698","text_snippet":"148","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-720","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":148,"prior_value":138.0},{"tag":"us-gaap:OtherAssetsNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":5.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Other Assets, Noncurrent","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:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2252","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1645","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":3.0},{"tag":"us-gaap:OtherLiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,8.0,7],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,8.0,7],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":4.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Other Liabilities, Noncurrent","current_period_value":396,"prior_period_value":null,"visual_current_value":396,"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-32","char_anchor":"f-346","text_snippet":"396","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":396,"prior_value":null},{"tag":"us-gaap:OtherLiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,8.0,7],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,8.0,7],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":4.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Other Liabilities, Noncurrent","current_period_value":342,"prior_period_value":null,"visual_current_value":342,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-740","text_snippet":"342","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":342,"prior_value":null},{"tag":"us-gaap:OtherLiabilitiesNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1,8.0,7],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","section_label":"Non-Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrentAbstract","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,2.0,1,8.0,7],"section_concept":"us-gaap:LiabilitiesNoncurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesNoncurrent","weight":1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesNoncurrent","calculation_weight":1.0,"calculation_order":8.0,"section_label":"Non-Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":4.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Other Liabilities, Noncurrent","current_period_value":3,"prior_period_value":null,"visual_current_value":3,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2264","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":null},{"tag":"us-gaap:TaxesPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,6.0,5],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,6.0,5],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":3.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Taxes Payable, Current","current_period_value":200,"prior_period_value":null,"visual_current_value":200,"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-32","char_anchor":"f-324","text_snippet":"200","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":200,"prior_value":null},{"tag":"us-gaap:TaxesPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,6.0,5],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,6.0,5],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":3.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Taxes Payable, Current","current_period_value":290,"prior_period_value":null,"visual_current_value":290,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-716","text_snippet":"290","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":290,"prior_value":null},{"tag":"us-gaap:TaxesPayableCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|consumersenergycompanyconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0,6.0,5],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","section_label":"Current Liabilities"},{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrentAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0,6.0,5],"section_concept":"us-gaap:LiabilitiesCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:LiabilitiesCurrent","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:LiabilitiesCurrent","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Current Liabilities"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Liabilities","weight":1.0,"order":3.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Liabilities","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Taxes Payable, Current","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":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2258","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":null},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":36583,"prior_period_value":34156.0,"visual_current_value":36583,"visual_prior_value":34156.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-288","text_snippet":"36,583","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-33","char_anchor":"f-1816","text_snippet":"34,156","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":36583,"prior_value":34156.0},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":30,"prior_period_value":21.0,"visual_current_value":30,"visual_prior_value":21.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-394","char_anchor":"f-1638","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-412","char_anchor":"f-1815","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":21.0},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":36553,"prior_period_value":34135.0,"visual_current_value":36553,"visual_prior_value":34135.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-393","char_anchor":"f-1637","text_snippet":"36,553","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-411","char_anchor":"f-1814","text_snippet":"34,135","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":36553,"prior_value":34135.0},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":21095,"prior_period_value":19826.0,"visual_current_value":21095,"visual_prior_value":19826.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-390","char_anchor":"f-1634","text_snippet":"21,095","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-408","char_anchor":"f-1811","text_snippet":"19,826","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":21095,"prior_value":19826.0},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":13890,"prior_period_value":12840.0,"visual_current_value":13890,"visual_prior_value":12840.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-391","char_anchor":"f-1635","text_snippet":"13,890","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-409","char_anchor":"f-1812","text_snippet":"12,840","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":13890,"prior_value":12840.0},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":1568,"prior_period_value":1469.0,"visual_current_value":1568,"visual_prior_value":1469.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-392","char_anchor":"f-1636","text_snippet":"1,568","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-410","char_anchor":"f-1813","text_snippet":"1,469","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1568,"prior_value":1469.0},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":36583,"prior_period_value":null,"visual_current_value":36583,"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-32","char_anchor":"f-288","text_snippet":"36,583","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":36583,"prior_value":null},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":21095,"prior_period_value":null,"visual_current_value":21095,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-390","char_anchor":"f-1634","text_snippet":"21,095","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":21095,"prior_value":null},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":13890,"prior_period_value":null,"visual_current_value":13890,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-391","char_anchor":"f-1635","text_snippet":"13,890","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":13890,"prior_value":null},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":1568,"prior_period_value":null,"visual_current_value":1568,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-392","char_anchor":"f-1636","text_snippet":"1,568","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":1568,"prior_value":null},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":36553,"prior_period_value":null,"visual_current_value":36553,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-393","char_anchor":"f-1637","text_snippet":"36,553","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":36553,"prior_value":null},{"tag":"cms:PropertyPlantAndEquipmentGrossExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Plant, property, and equipment, gross","current_period_value":30,"prior_period_value":null,"visual_current_value":30,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-394","char_anchor":"f-1638","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":null},{"tag":"us-gaap:AccountsReceivableNetCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,4.0,3],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":4.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Accounts Receivable, after Allowance for Credit Loss, Current","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":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2246","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1639","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:AccountsReceivableNetCurrent","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,1.0,0,4.0,3],"section_concept":"us-gaap:AssetsCurrentAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrent","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:AssetsCurrent","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Current Assets"},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":4.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Accounts Receivable, after Allowance for Credit Loss, Current","current_period_value":12,"prior_period_value":9.0,"visual_current_value":12,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-36","char_anchor":"f-272","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-42","char_anchor":"f-294","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":9.0},{"tag":"us-gaap:PropertyPlantAndEquipmentNet","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":2.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Property, Plant and Equipment, Net","current_period_value":29690,"prior_period_value":26671.0,"visual_current_value":29690,"visual_prior_value":26671.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-296","text_snippet":"29,690","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-318","text_snippet":"26,671","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":29690,"prior_value":26671.0},{"tag":"us-gaap:PropertyPlantAndEquipmentNet","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited|variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","parent":"us-gaap:Assets","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedbalancesheetsunaudited","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:Assets","weight":1.0,"order":2.0}],"calculation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","calculation_parent":"us-gaap:Assets","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Property, Plant and Equipment, Net","current_period_value":1028,"prior_period_value":1036.0,"visual_current_value":1028,"visual_prior_value":1036.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2250","text_snippet":"1,028","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1643","text_snippet":"1,036","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1028,"prior_value":1036.0},{"tag":"cms:PaymentsOfOrdinaryDividendsCommonAndPreferred","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Financing Activities"}],"concept_label":"Payments Of Ordinary Dividends, Common And Preferred","current_period_value":496,"prior_period_value":470.0,"visual_current_value":-496,"visual_prior_value":-470.0,"end_current":"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-248","text_snippet":"496","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-249","text_snippet":"470","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-496,"prior_value":-470.0},{"tag":"us-gaap:ProceedsFromIssuanceOfCommonStock","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from Issuance of Common Stock","current_period_value":373,"prior_period_value":283.0,"visual_current_value":373,"visual_prior_value":283.0,"end_current":"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-246","text_snippet":"373","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-247","text_snippet":"283","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":373,"prior_value":283.0},{"tag":"us-gaap:ProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","current_period_value":272,"prior_period_value":247.0,"visual_current_value":272,"visual_prior_value":247.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-148","text_snippet":"272","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-149","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":272,"prior_value":247.0},{"tag":"us-gaap:ProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","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:StatementEquityComponentsAxis=us-gaap:NoncontrollingInterestMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:NoncontrollingInterestMember","member_label":"Noncontrolling Interest"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-86","char_anchor":"f-464","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-87","char_anchor":"f-465","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-6.0},{"tag":"us-gaap:ProfitLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","current_period_value":277,"prior_period_value":253.0,"visual_current_value":277,"visual_prior_value":253.0,"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-70","char_anchor":"f-432","text_snippet":"277","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-71","char_anchor":"f-433","text_snippet":"253","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":277,"prior_value":253.0},{"tag":"us-gaap:ProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","current_period_value":760,"prior_period_value":692.0,"visual_current_value":760,"visual_prior_value":692.0,"end_current":"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-150","text_snippet":"760","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-151","text_snippet":"692","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":760,"prior_value":692.0},{"tag":"us-gaap:ProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","current_period_value":848,"prior_period_value":726.0,"visual_current_value":848,"visual_prior_value":726.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-604","text_snippet":"848","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-605","text_snippet":"726","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":848,"prior_value":726.0},{"tag":"us-gaap:ProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","current_period_value":-22,"prior_period_value":-46.0,"visual_current_value":-22,"visual_prior_value":-46.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:NoncontrollingInterestMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:NoncontrollingInterestMember","member_label":"Noncontrolling Interest"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-88","char_anchor":"f-466","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-89","char_anchor":"f-467","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-22,"prior_value":-46.0},{"tag":"us-gaap:ProfitLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Net Income (Loss), Including Portion Attributable to Noncontrolling Interest","current_period_value":782,"prior_period_value":738.0,"visual_current_value":782,"visual_prior_value":738.0,"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-72","char_anchor":"f-434","text_snippet":"782","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-73","char_anchor":"f-435","text_snippet":"738","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":782,"prior_value":738.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":288,"prior_period_value":273.0,"visual_current_value":288,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-88","text_snippet":"288","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-89","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":288,"prior_value":273.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":288,"prior_period_value":273.0,"visual_current_value":288,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1571","text_snippet":"288","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1748","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":288,"prior_value":273.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":239,"prior_period_value":229.0,"visual_current_value":239,"visual_prior_value":229.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1568","text_snippet":"239","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1745","text_snippet":"229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":239,"prior_value":229.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":35,"prior_period_value":32.0,"visual_current_value":35,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1569","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1746","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":32.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1570","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1747","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":14,"prior_value":12.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":964,"prior_period_value":914.0,"visual_current_value":964,"visual_prior_value":914.0,"end_current":"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-90","text_snippet":"964","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-91","text_snippet":"914","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":964,"prior_value":914.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":964,"prior_period_value":913.0,"visual_current_value":964,"visual_prior_value":913.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1925","text_snippet":"964","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2090","text_snippet":"913","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":964,"prior_value":913.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":682,"prior_period_value":651.0,"visual_current_value":682,"visual_prior_value":651.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1922","text_snippet":"682","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2087","text_snippet":"651","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":682,"prior_value":651.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":243,"prior_period_value":226.0,"visual_current_value":243,"visual_prior_value":226.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1923","text_snippet":"243","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2088","text_snippet":"226","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":243,"prior_value":226.0},{"tag":"us-gaap:DepreciationDepletionAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Depreciation, Depletion and Amortization","current_period_value":39,"prior_period_value":36.0,"visual_current_value":39,"visual_prior_value":36.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1924","text_snippet":"39","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2089","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":39,"prior_value":36.0},{"tag":"us-gaap:CapitalExpendituresIncurredButNotYetPaid","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"cms:NonCashTransactionsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6,1.0,0],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"cms:NonCashTransactionsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Capital Expenditures Incurred but Not yet Paid","current_period_value":586,"prior_period_value":387.0,"visual_current_value":586,"visual_prior_value":387.0,"end_current":"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-262","text_snippet":"586","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-263","text_snippet":"387","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":586,"prior_value":387.0},{"tag":"us-gaap:CapitalExpendituresIncurredButNotYetPaid","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"cms:NonCashTransactionsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,7.0,6,1.0,0],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"cms:NonCashTransactionsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,7.0,6,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Capital Expenditures Incurred but Not yet Paid","current_period_value":453,"prior_period_value":382.0,"visual_current_value":453,"visual_prior_value":382.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-654","text_snippet":"453","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-655","text_snippet":"382","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":453,"prior_value":382.0},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:StatementLineItems","order":5.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:StatementOfCashFlowsAbstract","order":5.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation","current_period_value":432,"prior_period_value":467.0,"visual_current_value":432,"visual_prior_value":467.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-260","text_snippet":"432","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-33","char_anchor":"f-261","text_snippet":"467","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":432,"prior_value":467.0},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents","date_type":"Q","period_type":"instant","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:StatementLineItems","order":5.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:StatementOfCashFlowsAbstract","order":5.0,"preferred_label_role":"periodStartLabel","global_sort_position":[0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation","current_period_value":311,"prior_period_value":403.0,"visual_current_value":311,"visual_prior_value":403.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-652","text_snippet":"311","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-106","char_anchor":"f-653","text_snippet":"403","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":311,"prior_value":403.0},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":254,"prior_period_value":219.0,"visual_current_value":254,"visual_prior_value":219.0,"end_current":"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-256","text_snippet":"254","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-257","text_snippet":"219","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":254,"prior_value":219.0},{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":192,"prior_period_value":347.0,"visual_current_value":192,"visual_prior_value":347.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-648","text_snippet":"192","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-649","text_snippet":"347","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":192,"prior_value":347.0},{"tag":"us-gaap:DeferredIncomeTaxesAndTaxCredits","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,2.0,1],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Activities"}],"concept_label":"Deferred Income Taxes and Tax Credits","current_period_value":171,"prior_period_value":103.0,"visual_current_value":171,"visual_prior_value":103.0,"end_current":"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-216","text_snippet":"171","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-217","text_snippet":"103","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":171,"prior_value":103.0},{"tag":"us-gaap:DeferredIncomeTaxesAndTaxCredits","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,2.0,1],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Activities"}],"concept_label":"Deferred Income Taxes and Tax Credits","current_period_value":57,"prior_period_value":99.0,"visual_current_value":57,"visual_prior_value":99.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-608","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-609","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":57,"prior_value":99.0},{"tag":"us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Accounts and Other Receivables","current_period_value":-114,"prior_period_value":-185.0,"visual_current_value":114,"visual_prior_value":185.0,"end_current":"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-220","text_snippet":"114","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-221","text_snippet":"185","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":114,"prior_value":185.0},{"tag":"us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":5.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Accounts and Other Receivables","current_period_value":-124,"prior_period_value":-184.0,"visual_current_value":124,"visual_prior_value":184.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-612","text_snippet":"124","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-613","text_snippet":"184","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":124,"prior_value":184.0},{"tag":"us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Accounts Payable and Accrued Liabilities","current_period_value":-6,"prior_period_value":15.0,"visual_current_value":-6,"visual_prior_value":15.0,"end_current":"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-224","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-225","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-6,"prior_value":15.0},{"tag":"us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Accounts Payable and Accrued Liabilities","current_period_value":1,"prior_period_value":25.0,"visual_current_value":1,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-616","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-617","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":25.0},{"tag":"us-gaap:IncreaseDecreaseInInventories","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":6.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Inventories","current_period_value":134,"prior_period_value":-51.0,"visual_current_value":-134,"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-222","text_snippet":"134","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-223","text_snippet":"51","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-134,"prior_value":51.0},{"tag":"us-gaap:IncreaseDecreaseInInventories","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":6.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Inventories","current_period_value":137,"prior_period_value":-50.0,"visual_current_value":-137,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-614","text_snippet":"137","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-615","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-137,"prior_value":50.0},{"tag":"us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":8.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Other Current Assets and Liabilities, Net","current_period_value":-103,"prior_period_value":3.0,"visual_current_value":103,"visual_prior_value":-3.0,"end_current":"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-226","text_snippet":"103","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-227","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":103,"prior_value":-3.0},{"tag":"us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":8.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":8.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Other Current Assets and Liabilities, Net","current_period_value":-121,"prior_period_value":29.0,"visual_current_value":121,"visual_prior_value":-29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-618","text_snippet":"121","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-619","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":121,"prior_value":-29.0},{"tag":"us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":9.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":9.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net","current_period_value":34,"prior_period_value":-162.0,"visual_current_value":-34,"visual_prior_value":162.0,"end_current":"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-228","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-229","text_snippet":"162","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-34,"prior_value":162.0},{"tag":"us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:IncreaseDecreaseInReceivablesAbstract","order":5.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":9.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":9.0,"section_label":"Operating Activities"}],"concept_label":"Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net","current_period_value":54,"prior_period_value":-145.0,"visual_current_value":-54,"visual_prior_value":145.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-620","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-621","text_snippet":"145","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-54,"prior_value":145.0},{"tag":"us-gaap:NetCashProvidedByUsedInFinancingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,8.0,7],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,8.0,7],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":1423,"prior_period_value":353.0,"visual_current_value":1423,"visual_prior_value":353.0,"end_current":"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-254","text_snippet":"1,423","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-255","text_snippet":"353","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1423,"prior_value":353.0},{"tag":"us-gaap:NetCashProvidedByUsedInFinancingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,8.0,7],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,3.0,2,8.0,7],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","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":987,"prior_period_value":327.0,"visual_current_value":987,"visual_prior_value":327.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-646","text_snippet":"987","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-647","text_snippet":"327","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":987,"prior_value":327.0},{"tag":"us-gaap:NetCashProvidedByUsedInInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","section_label":"Investing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Investing Activities"}],"concept_label":"Cash Provided by (Used in) Investing Activity, Including Discontinued Operation","current_period_value":-2926,"prior_period_value":-2101.0,"visual_current_value":-2926,"visual_prior_value":-2101.0,"end_current":"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-238","text_snippet":"2,926","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-239","text_snippet":"2,101","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-2926,"prior_value":-2101.0},{"tag":"us-gaap:NetCashProvidedByUsedInInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","section_label":"Investing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Investing Activities"}],"concept_label":"Cash Provided by (Used in) Investing Activity, Including Discontinued Operation","current_period_value":-2569,"prior_period_value":-1994.0,"visual_current_value":-2569,"visual_prior_value":-1994.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-630","text_snippet":"2,569","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-631","text_snippet":"1,994","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-2569,"prior_value":-1994.0},{"tag":"us-gaap:NetCashProvidedByUsedInOperatingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Cash Provided by (Used in) Operating Activity, Including Discontinued Operation","current_period_value":1757,"prior_period_value":1967.0,"visual_current_value":1757,"visual_prior_value":1967.0,"end_current":"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-230","text_snippet":"1,757","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-231","text_snippet":"1,967","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1757,"prior_value":1967.0,"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 (Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation). 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":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":"us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Activities"}],"concept_label":"Cash Provided by (Used in) Operating Activity, Including Discontinued Operation","current_period_value":1774,"prior_period_value":2014.0,"visual_current_value":1774,"visual_prior_value":2014.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-622","text_snippet":"1,774","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-623","text_snippet":"2,014","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1774,"prior_value":2014.0,"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 (Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation). 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:OtherNoncashIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,3.0,2],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":4.0,"section_label":"Operating Activities"}],"concept_label":"Other Noncash Income (Expense)","current_period_value":181,"prior_period_value":152.0,"visual_current_value":-181,"visual_prior_value":-152.0,"end_current":"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-218","text_snippet":"181","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-219","text_snippet":"152","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-181,"prior_value":-152.0},{"tag":"us-gaap:OtherNoncashIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,3.0,2],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","weight":-1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInOperatingActivities","calculation_weight":-1.0,"calculation_order":4.0,"section_label":"Operating Activities"}],"concept_label":"Other Noncash Income (Expense)","current_period_value":111,"prior_period_value":64.0,"visual_current_value":-111,"visual_prior_value":-64.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-610","text_snippet":"111","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-611","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-111,"prior_value":-64.0},{"tag":"us-gaap:PaymentsForProceedsFromOtherInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","section_label":"Investing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Investing Activities"}],"concept_label":"Payment for (Proceeds from) Other Investing Activity","current_period_value":176,"prior_period_value":125.0,"visual_current_value":-176,"visual_prior_value":-125.0,"end_current":"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-236","text_snippet":"176","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-237","text_snippet":"125","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-176,"prior_value":-125.0},{"tag":"us-gaap:PaymentsForProceedsFromOtherInvestingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","section_label":"Investing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Investing Activities"}],"concept_label":"Payment for (Proceeds from) Other Investing Activity","current_period_value":180,"prior_period_value":119.0,"visual_current_value":-180,"visual_prior_value":-119.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-628","text_snippet":"180","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-629","text_snippet":"119","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-180,"prior_value":-119.0},{"tag":"us-gaap:PaymentsToAcquirePropertyPlantAndEquipment","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","section_label":"Investing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":1.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Property, Plant, and Equipment","current_period_value":2750,"prior_period_value":2100.0,"visual_current_value":-2750,"visual_prior_value":-2100.0,"end_current":"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-232","text_snippet":"2,750","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-233","text_snippet":"2,100","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-2750,"prior_value":-2100.0},{"tag":"us-gaap:PaymentsToAcquirePropertyPlantAndEquipment","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","section_label":"Investing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInInvestingActivities","calculation_weight":-1.0,"calculation_order":1.0,"section_label":"Investing Activities"}],"concept_label":"Payments to Acquire Property, Plant, and Equipment","current_period_value":2389,"prior_period_value":1999.0,"visual_current_value":-2389,"visual_prior_value":-1999.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-624","text_snippet":"2,389","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-625","text_snippet":"1,999","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-2389,"prior_value":-1999.0},{"tag":"us-gaap:ProceedsFromIssuanceOfLongTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from Issuance of Long-Term Debt","current_period_value":2511,"prior_period_value":1447.0,"visual_current_value":2511,"visual_prior_value":1447.0,"end_current":"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-240","text_snippet":"2,511","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-241","text_snippet":"1,447","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2511,"prior_value":1447.0},{"tag":"us-gaap:ProceedsFromIssuanceOfLongTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from Issuance of Long-Term Debt","current_period_value":1123,"prior_period_value":1297.0,"visual_current_value":1123,"visual_prior_value":1297.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-632","text_snippet":"1,123","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-633","text_snippet":"1,297","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1123,"prior_value":1297.0},{"tag":"us-gaap:ProceedsFromPaymentsForOtherFinancingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":7.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,7.0,6],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":7.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2,7.0,6],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from (Payment for) Other Financing Activity","current_period_value":-60,"prior_period_value":-25.0,"visual_current_value":-60,"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-252","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-253","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-60,"prior_value":-25.0},{"tag":"us-gaap:ProceedsFromPaymentsForOtherFinancingActivities","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":7.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,7.0,6],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":7.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2,7.0,6],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":7.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from (Payment for) Other Financing Activity","current_period_value":-16,"prior_period_value":-10.0,"visual_current_value":-16,"visual_prior_value":-10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-644","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-645","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-16,"prior_value":-10.0},{"tag":"us-gaap:ProceedsFromRepaymentsOfShortTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from (Repayments of) Short-Term Debt","current_period_value":-65,"prior_period_value":-93.0,"visual_current_value":-65,"visual_prior_value":-93.0,"end_current":"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-244","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-245","text_snippet":"93","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-65,"prior_value":-93.0},{"tag":"us-gaap:ProceedsFromRepaymentsOfShortTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,3.0,2,3.0,2],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Financing Activities"}],"concept_label":"Proceeds from (Repayments of) Short-Term Debt","current_period_value":-65,"prior_period_value":-93.0,"visual_current_value":-65,"visual_prior_value":-93.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-636","text_snippet":"65","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-637","text_snippet":"93","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-65,"prior_value":-93.0},{"tag":"us-gaap:RepaymentsOfLongTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Financing Activities"}],"concept_label":"Repayments of Long-Term Debt","current_period_value":884,"prior_period_value":789.0,"visual_current_value":-884,"visual_prior_value":-789.0,"end_current":"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-242","text_snippet":"884","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-243","text_snippet":"789","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-884,"prior_value":-789.0},{"tag":"us-gaap:RepaymentsOfLongTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Financing Activities"}],"concept_label":"Repayments of Long-Term Debt","current_period_value":100,"prior_period_value":322.0,"visual_current_value":-100,"visual_prior_value":-322.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-634","text_snippet":"100","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-635","text_snippet":"322","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-100,"prior_value":-322.0},{"tag":"us-gaap:RepaymentsOfLongTermDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":2.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Financing Activities"}],"concept_label":"Repayments of Long-Term Debt","current_period_value":109,"prior_period_value":218.0,"visual_current_value":-109,"visual_prior_value":-218.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-193","char_anchor":"f-927","text_snippet":"109","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-198","char_anchor":"f-934","text_snippet":"218","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-109,"prior_value":-218.0},{"tag":"us-gaap:ProceedsFromSaleOfInterestInPartnershipUnit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited|variableinterestentitiesnarrativedetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,6.0,5],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcashflowsunaudited","calculation_parent":"us-gaap:NetCashProvidedByUsedInFinancingActivities","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Financing Activities"},{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Proceeds from Sale of Interest in Partnership Unit","current_period_value":44,"prior_period_value":null,"visual_current_value":44,"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-1","char_anchor":"f-250","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":44,"prior_value":null},{"tag":"cms:NoncontrollingInterestIncreaseDecreaseFromOtherChanges","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Other changes in noncontrolling interests","current_period_value":-5,"prior_period_value":-2.0,"visual_current_value":-5,"visual_prior_value":-2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:NoncontrollingInterestMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:NoncontrollingInterestMember","member_label":"Noncontrolling Interest"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-86","char_anchor":"f-468","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-87","char_anchor":"f-469","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-2.0},{"tag":"cms:NoncontrollingInterestIncreaseDecreaseFromOtherChanges","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Other changes in noncontrolling interests","current_period_value":-7,"prior_period_value":-5.0,"visual_current_value":-7,"visual_prior_value":-5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:NoncontrollingInterestMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:NoncontrollingInterestMember","member_label":"Noncontrolling Interest"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-88","char_anchor":"f-470","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-89","char_anchor":"f-471","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-5.0},{"tag":"us-gaap:CommonStockDividendsPerShareDeclared","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Dividends, Per Share, Declared","current_period_value":0.5425,"prior_period_value":0.515,"visual_current_value":0.5425,"visual_prior_value":0.515,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-480","text_snippet":"0.5425","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-481","text_snippet":"0.5150","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.5425,"prior_value":0.515},{"tag":"us-gaap:CommonStockDividendsPerShareDeclared","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:StatementLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Common Stock, Dividends, Per Share, Declared","current_period_value":1.6275,"prior_period_value":1.545,"visual_current_value":1.6275,"visual_prior_value":1.545,"end_current":"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-482","text_snippet":"1.6275","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-483","text_snippet":"1.5450","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":1.6275,"prior_value":1.545},{"tag":"us-gaap:NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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,"section_label":null}],"concept_label":"Noncontrolling Interest, Increase from Sale of Parent Equity Interest","current_period_value":-34,"prior_period_value":null,"visual_current_value":-34,"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-52","char_anchor":"f-406","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":-34,"prior_value":null},{"tag":"us-gaap:NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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,"section_label":null}],"concept_label":"Noncontrolling Interest, Increase from Sale of Parent Equity Interest","current_period_value":78,"prior_period_value":null,"visual_current_value":78,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:StatementEquityComponentsAxis=us-gaap:NoncontrollingInterestMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:NoncontrollingInterestMember","member_label":"Noncontrolling Interest"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-88","char_anchor":"f-462","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":78,"prior_value":null},{"tag":"us-gaap:PreferredStockDividendsPerShareDeclared","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:StatementLineItems","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":"Preferred Stock, Dividends Per Share, Declared","current_period_value":0.2625,"prior_period_value":0.2625,"visual_current_value":0.2625,"visual_prior_value":0.2625,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-484","text_snippet":"0.2625","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-485","text_snippet":"0.2625","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.2625,"prior_value":0.2625},{"tag":"us-gaap:PreferredStockDividendsPerShareDeclared","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:StatementLineItems","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":"Preferred Stock, Dividends Per Share, Declared","current_period_value":0.7875,"prior_period_value":0.7875,"visual_current_value":0.7875,"visual_prior_value":0.7875,"end_current":"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-486","text_snippet":"0.7875","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-487","text_snippet":"0.7875","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.7875,"prior_value":0.7875},{"tag":"us-gaap:StockIssuedDuringPeriodValueNewIssues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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,"section_label":null}],"concept_label":"Stock Issued During Period, Value, New Issues","current_period_value":358,"prior_period_value":10.0,"visual_current_value":358,"visual_prior_value":10.0,"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-50","char_anchor":"f-396","text_snippet":"358","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-51","char_anchor":"f-397","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":358,"prior_value":10.0},{"tag":"us-gaap:StockIssuedDuringPeriodValueNewIssues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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,"section_label":null}],"concept_label":"Stock Issued During Period, Value, New Issues","current_period_value":393,"prior_period_value":307.0,"visual_current_value":393,"visual_prior_value":307.0,"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-52","char_anchor":"f-398","text_snippet":"393","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-53","char_anchor":"f-399","text_snippet":"307","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":393,"prior_value":307.0},{"tag":"us-gaap:StockRepurchasedDuringPeriodValue","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Stock Repurchased During Period, Value","current_period_value":13,"prior_period_value":11.0,"visual_current_value":-13,"visual_prior_value":-11.0,"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-52","char_anchor":"f-402","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-53","char_anchor":"f-403","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-13,"prior_value":-11.0},{"tag":"us-gaap:StockRepurchasedDuringPeriodValue","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Stock Repurchased During Period, Value","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: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-50","char_anchor":"f-400","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax","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-11","char_anchor":"f-192","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax","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-1","char_anchor":"f-194","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax","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:AccumulatedDefinedBenefitPlansAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember","member_label":"Accumulated Defined Benefit Plans Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-60","char_anchor":"f-420","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,6.0,5],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax","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:AccumulatedDefinedBenefitPlansAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember","member_label":"Accumulated Defined Benefit Plans Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-62","char_anchor":"f-422","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after 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-1","char_anchor":"f-186","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-187","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after 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":"us-gaap:StatementEquityComponentsAxis=us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember","member_label":"Accumulated Defined Benefit Plans Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-62","char_anchor":"f-418","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-63","char_anchor":"f-419","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax","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-11","char_anchor":"f-184","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":null},{"tag":"us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract","order":1.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:OtherComprehensiveIncomeLossNetOfTax","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax","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:AccumulatedDefinedBenefitPlansAdjustmentMember","dimensions":[{"axis":"us-gaap:StatementEquityComponentsAxis","axis_label":"Equity Components","member":"us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember","member_label":"Accumulated Defined Benefit Plans Adjustment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-60","char_anchor":"f-416","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":null},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"Dividends, Common Stock, Cash","current_period_value":233,"prior_period_value":185.0,"visual_current_value":-233,"visual_prior_value":-185.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-143","char_anchor":"f-820","text_snippet":"233","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-144","char_anchor":"f-821","text_snippet":"185","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-233,"prior_value":-185.0},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"Dividends, Common Stock, Cash","current_period_value":162,"prior_period_value":153.0,"visual_current_value":-162,"visual_prior_value":-153.0,"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-70","char_anchor":"f-436","text_snippet":"162","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-71","char_anchor":"f-437","text_snippet":"153","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-162,"prior_value":-153.0},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"Dividends, Common Stock, Cash","current_period_value":649,"prior_period_value":544.0,"visual_current_value":-649,"visual_prior_value":-544.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-145","char_anchor":"f-822","text_snippet":"649","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-146","char_anchor":"f-823","text_snippet":"544","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-649,"prior_value":-544.0},{"tag":"us-gaap:DividendsCommonStockCash","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":8.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","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":"Dividends, Common Stock, Cash","current_period_value":487,"prior_period_value":461.0,"visual_current_value":-487,"visual_prior_value":-461.0,"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-72","char_anchor":"f-438","text_snippet":"487","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-73","char_anchor":"f-439","text_snippet":"461","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-487,"prior_value":-461.0},{"tag":"us-gaap:DividendsPreferredStockCash","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":9.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,9.0,8],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Preferred Stock, Cash","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":"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-70","char_anchor":"f-440","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-71","char_anchor":"f-441","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-2.0},{"tag":"us-gaap:DividendsPreferredStockCash","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":9.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,9.0,8],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Preferred Stock, Cash","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-145","char_anchor":"f-826","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-146","char_anchor":"f-827","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:DividendsPreferredStockCash","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":9.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,9.0,8],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":7.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Dividends, Preferred Stock, Cash","current_period_value":7,"prior_period_value":7.0,"visual_current_value":-7,"visual_prior_value":-7.0,"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-72","char_anchor":"f-442","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-73","char_anchor":"f-443","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-7.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest","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":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-204","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-205","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-6.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest","current_period_value":-22,"prior_period_value":-46.0,"visual_current_value":-22,"visual_prior_value":-46.0,"end_current":"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-206","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-207","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-22,"prior_value":-46.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":272,"prior_period_value":247.0,"visual_current_value":272,"visual_prior_value":247.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-200","text_snippet":"272","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-201","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":272,"prior_value":247.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":760,"prior_period_value":693.0,"visual_current_value":760,"visual_prior_value":693.0,"end_current":"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-202","text_snippet":"760","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-203","text_snippet":"693","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":760,"prior_value":693.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":277,"prior_period_value":253.0,"visual_current_value":277,"visual_prior_value":253.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-208","text_snippet":"277","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-209","text_snippet":"253","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":277,"prior_value":253.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":314,"prior_period_value":274.0,"visual_current_value":314,"visual_prior_value":274.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-600","text_snippet":"314","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-601","text_snippet":"274","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":314,"prior_value":274.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":782,"prior_period_value":739.0,"visual_current_value":782,"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-1","char_anchor":"f-210","text_snippet":"782","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-211","text_snippet":"739","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":782,"prior_value":739.0},{"tag":"us-gaap:ComprehensiveIncomeNetOfTax","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","current_period_value":848,"prior_period_value":727.0,"visual_current_value":848,"visual_prior_value":727.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-602","text_snippet":"848","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-603","text_snippet":"727","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":848,"prior_value":727.0},{"tag":"cms:InterestExpenseOtherIncludingAdjustmentsForCapitalizedInterestExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Other interest expense","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:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-28","char_anchor":"f-130","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"cms:PurchasedPowerRelatedParties","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"}],"concept_label":"Purchased power – related parties","current_period_value":21,"prior_period_value":19.0,"visual_current_value":21,"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-11","char_anchor":"f-76","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-77","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":21,"prior_value":19.0},{"tag":"cms:PurchasedPowerRelatedParties","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":6.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"}],"concept_label":"Purchased power – related parties","current_period_value":69,"prior_period_value":53.0,"visual_current_value":69,"visual_prior_value":53.0,"end_current":"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-78","text_snippet":"69","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-79","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":69,"prior_value":53.0},{"tag":"us-gaap:EarningsPerShareBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Earnings Per Share, Basic","current_period_value":0.92,"prior_period_value":0.84,"visual_current_value":0.92,"visual_prior_value":0.84,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-168","text_snippet":"0.92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-169","text_snippet":"0.84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.92,"prior_value":0.84},{"tag":"us-gaap:EarningsPerShareBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Earnings Per Share, Basic","current_period_value":2.59,"prior_period_value":2.45,"visual_current_value":2.59,"visual_prior_value":2.45,"end_current":"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-170","text_snippet":"2.59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-171","text_snippet":"2.45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":2.59,"prior_value":2.45},{"tag":"us-gaap:EarningsPerShareDiluted","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Earnings Per Share, Diluted","current_period_value":0.92,"prior_period_value":0.84,"visual_current_value":0.92,"visual_prior_value":0.84,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-172","text_snippet":"0.92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-173","text_snippet":"0.84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.92,"prior_value":0.84},{"tag":"us-gaap:EarningsPerShareDiluted","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Earnings Per Share, Diluted","current_period_value":2.59,"prior_period_value":2.45,"visual_current_value":2.59,"visual_prior_value":2.45,"end_current":"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-174","text_snippet":"2.59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-175","text_snippet":"2.45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":2.59,"prior_value":2.45},{"tag":"us-gaap:FuelCosts","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Expenses"}],"concept_label":"Fuel Costs","current_period_value":153,"prior_period_value":179.0,"visual_current_value":153,"visual_prior_value":179.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-68","text_snippet":"153","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-69","text_snippet":"179","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":153,"prior_value":179.0},{"tag":"us-gaap:FuelCosts","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Expenses"}],"concept_label":"Fuel Costs","current_period_value":504,"prior_period_value":449.0,"visual_current_value":504,"visual_prior_value":449.0,"end_current":"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-70","text_snippet":"504","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-71","text_snippet":"449","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":504,"prior_value":449.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":277,"prior_period_value":253.0,"visual_current_value":277,"visual_prior_value":253.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-156","text_snippet":"277","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-157","text_snippet":"253","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":277,"prior_value":253.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":314,"prior_period_value":273.0,"visual_current_value":314,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-572","text_snippet":"314","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-573","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":314,"prior_value":273.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":314,"prior_period_value":273.0,"visual_current_value":314,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-143","char_anchor":"f-816","text_snippet":"314","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-144","char_anchor":"f-817","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":314,"prior_value":273.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":782,"prior_period_value":738.0,"visual_current_value":782,"visual_prior_value":738.0,"end_current":"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-158","text_snippet":"782","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-159","text_snippet":"738","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":782,"prior_value":738.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":848,"prior_period_value":726.0,"visual_current_value":848,"visual_prior_value":726.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-574","text_snippet":"848","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-575","text_snippet":"726","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":848,"prior_value":726.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":-8,"prior_period_value":-10.0,"visual_current_value":-8,"visual_prior_value":-10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-2051","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-436","char_anchor":"f-2216","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":-10.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":856,"prior_period_value":736.0,"visual_current_value":856,"visual_prior_value":736.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2050","text_snippet":"856","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2215","text_snippet":"736","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":856,"prior_value":736.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":618,"prior_period_value":541.0,"visual_current_value":618,"visual_prior_value":541.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2048","text_snippet":"618","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2213","text_snippet":"541","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":618,"prior_value":541.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":238,"prior_period_value":195.0,"visual_current_value":238,"visual_prior_value":195.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2049","text_snippet":"238","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2214","text_snippet":"195","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":238,"prior_value":195.0},{"tag":"us-gaap:NetIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited|consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,8.0,7],"section_concept":null,"section_label":null},{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:StatementLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","parent":"us-gaap:ComprehensiveIncomeNetOfTax","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofcomprehensiveincomeunaudited","calculation_parent":"us-gaap:ComprehensiveIncomeNetOfTax","calculation_weight":1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Attributable to Parent","current_period_value":848,"prior_period_value":726.0,"visual_current_value":848,"visual_prior_value":726.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:RetainedEarningsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-145","char_anchor":"f-818","text_snippet":"848","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-146","char_anchor":"f-819","text_snippet":"726","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":848,"prior_value":726.0},{"tag":"cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Non-operating retirement benefits, net","current_period_value":48,"prior_period_value":42.0,"visual_current_value":48,"visual_prior_value":42.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-104","text_snippet":"48","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-105","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":48,"prior_value":42.0},{"tag":"cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Non-operating retirement benefits, net","current_period_value":44,"prior_period_value":39.0,"visual_current_value":44,"visual_prior_value":39.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-528","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-529","text_snippet":"39","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":44,"prior_value":39.0},{"tag":"cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Non-operating retirement benefits, net","current_period_value":137,"prior_period_value":127.0,"visual_current_value":137,"visual_prior_value":127.0,"end_current":"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-106","text_snippet":"137","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-107","text_snippet":"127","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":137,"prior_value":127.0},{"tag":"cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Non-operating retirement benefits, net","current_period_value":128,"prior_period_value":118.0,"visual_current_value":128,"visual_prior_value":118.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-530","text_snippet":"128","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-531","text_snippet":"118","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":128,"prior_value":118.0},{"tag":"us-gaap:InterestCostsCapitalizedAdjustment","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest Costs Capitalized Adjustment","current_period_value":3,"prior_period_value":5.0,"visual_current_value":-3,"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-11","char_anchor":"f-132","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-133","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-5.0},{"tag":"us-gaap:InterestCostsCapitalizedAdjustment","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest Costs Capitalized Adjustment","current_period_value":3,"prior_period_value":4.0,"visual_current_value":-3,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-556","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-557","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-4.0},{"tag":"us-gaap:InterestCostsCapitalizedAdjustment","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest Costs Capitalized Adjustment","current_period_value":9,"prior_period_value":11.0,"visual_current_value":-9,"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-1","char_anchor":"f-134","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-135","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-9,"prior_value":-11.0},{"tag":"us-gaap:InterestCostsCapitalizedAdjustment","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":3.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Interest Costs Capitalized Adjustment","current_period_value":8,"prior_period_value":8.0,"visual_current_value":-8,"visual_prior_value":-8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-558","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-559","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":-8.0},{"tag":"us-gaap:InterestExpenseOther","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Interest Expense, Other","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-99","char_anchor":"f-552","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-100","char_anchor":"f-553","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:InterestExpenseOther","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Interest Expense, Other","current_period_value":10,"prior_period_value":9.0,"visual_current_value":10,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-95","char_anchor":"f-548","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-96","char_anchor":"f-549","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":9.0},{"tag":"us-gaap:InterestExpenseOther","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Interest Expense, Other","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:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-22","char_anchor":"f-124","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-23","char_anchor":"f-125","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":3.0},{"tag":"us-gaap:InterestExpenseOther","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Interest Expense, Other","current_period_value":6,"prior_period_value":8.0,"visual_current_value":6,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-101","char_anchor":"f-554","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-102","char_anchor":"f-555","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":8.0},{"tag":"us-gaap:InterestExpenseOther","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Interest Expense, Other","current_period_value":30,"prior_period_value":22.0,"visual_current_value":30,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-97","char_anchor":"f-550","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-98","char_anchor":"f-551","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":22.0},{"tag":"us-gaap:InterestExpenseOther","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Interest Expense, Other","current_period_value":8,"prior_period_value":9.0,"visual_current_value":8,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-24","char_anchor":"f-126","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-25","char_anchor":"f-127","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":9.0},{"tag":"us-gaap:OtherNonoperatingIncome","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Nonoperating Income","current_period_value":19,"prior_period_value":46.0,"visual_current_value":19,"visual_prior_value":46.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-108","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-109","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":46.0},{"tag":"us-gaap:OtherNonoperatingIncome","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Nonoperating Income","current_period_value":15,"prior_period_value":24.0,"visual_current_value":15,"visual_prior_value":24.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-532","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-533","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":15,"prior_value":24.0},{"tag":"us-gaap:OtherNonoperatingIncome","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Nonoperating Income","current_period_value":128,"prior_period_value":167.0,"visual_current_value":128,"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-1","char_anchor":"f-110","text_snippet":"128","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-111","text_snippet":"167","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":128,"prior_value":167.0},{"tag":"us-gaap:OtherNonoperatingIncome","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Other Nonoperating Income","current_period_value":44,"prior_period_value":67.0,"visual_current_value":44,"visual_prior_value":67.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-534","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-535","text_snippet":"67","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":44,"prior_value":67.0},{"tag":"us-gaap:PreferredStockDividendsIncomeStatementImpact","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock Dividends, Income Statement Impact","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-11","char_anchor":"f-160","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-161","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":2.0},{"tag":"us-gaap:PreferredStockDividendsIncomeStatementImpact","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock Dividends, Income Statement Impact","current_period_value":7,"prior_period_value":7.0,"visual_current_value":7,"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-1","char_anchor":"f-162","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-163","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":7.0},{"tag":"us-gaap:PreferredStockDividendsIncomeStatementImpact","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Preferred Stock Dividends, Income Statement Impact","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-578","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-579","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:OtherNonoperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Other Nonoperating Expense","current_period_value":5,"prior_period_value":4.0,"visual_current_value":-5,"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-11","char_anchor":"f-112","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-113","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-4.0},{"tag":"us-gaap:OtherNonoperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Other Nonoperating Expense","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-536","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-537","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-4,"prior_value":-3.0},{"tag":"us-gaap:OtherNonoperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Other Nonoperating Expense","current_period_value":16,"prior_period_value":11.0,"visual_current_value":-16,"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-1","char_anchor":"f-114","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-115","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-16,"prior_value":-11.0},{"tag":"us-gaap:OtherNonoperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Other Nonoperating Expense","current_period_value":11,"prior_period_value":10.0,"visual_current_value":-11,"visual_prior_value":-10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-538","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-539","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-11,"prior_value":-10.0},{"tag":"us-gaap:OtherNonoperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Other Nonoperating Expense","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:HedgingDesignationAxis=us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","dimensions":[{"axis":"us-gaap:HedgingDesignationAxis","axis_label":"Hedging Designation","member":"us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","member_label":"Not Designated As Hedging Instrument Economic Hedge"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-239","char_anchor":"f-1038","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OtherNonoperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NonoperatingIncomeExpense","weight":-1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NonoperatingIncomeExpense","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Other Nonoperating Expense","current_period_value":4,"prior_period_value":null,"visual_current_value":-4,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:HedgingDesignationAxis=us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","dimensions":[{"axis":"us-gaap:HedgingDesignationAxis","axis_label":"Hedging Designation","member":"us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","member_label":"Not Designated As Hedging Instrument Economic Hedge"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-240","char_anchor":"f-1039","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-4,"prior_value":null},{"tag":"us-gaap:InterestExpenseDebt","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":204,"prior_period_value":176.0,"visual_current_value":204,"visual_prior_value":176.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-120","text_snippet":"204","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-121","text_snippet":"176","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":204,"prior_value":176.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":135,"prior_period_value":123.0,"visual_current_value":135,"visual_prior_value":123.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-544","text_snippet":"135","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-545","text_snippet":"123","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":135,"prior_value":123.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":8,"prior_period_value":5.0,"visual_current_value":8,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:RepurchasedDebtMember|us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:RepurchasedDebtMember","member_label":"Repurchased Debt"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-195","char_anchor":"f-929","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-201","char_anchor":"f-937","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":5.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":590,"prior_period_value":519.0,"visual_current_value":590,"visual_prior_value":519.0,"end_current":"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-122","text_snippet":"590","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-123","text_snippet":"519","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":590,"prior_value":519.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":388,"prior_period_value":364.0,"visual_current_value":388,"visual_prior_value":364.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-546","text_snippet":"388","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-547","text_snippet":"364","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":388,"prior_value":364.0},{"tag":"us-gaap:InterestExpenseDebt","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseNonoperating","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:InterestExpenseNonoperating","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Interest Expense, Debt","current_period_value":21,"prior_period_value":13.0,"visual_current_value":21,"visual_prior_value":13.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:RepurchasedDebtMember|us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:RepurchasedDebtMember","member_label":"Repurchased Debt"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-196","char_anchor":"f-930","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-202","char_anchor":"f-938","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":21,"prior_value":13.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":2021,"prior_period_value":1743.0,"visual_current_value":2021,"visual_prior_value":1743.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-64","text_snippet":"2,021","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-65","text_snippet":"1,743","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2021,"prior_value":1743.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":1913,"prior_period_value":1661.0,"visual_current_value":1913,"visual_prior_value":1661.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-488","text_snippet":"1,913","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-489","text_snippet":"1,661","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1913,"prior_value":1661.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":1913,"prior_period_value":1661.0,"visual_current_value":1913,"visual_prior_value":1661.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1648","text_snippet":"1,913","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1825","text_snippet":"1,661","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1913,"prior_value":1661.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":1679,"prior_period_value":1448.0,"visual_current_value":1679,"visual_prior_value":1448.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1383","text_snippet":"1,679","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1428","text_snippet":"1,448","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1679,"prior_value":1448.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":234,"prior_period_value":213.0,"visual_current_value":234,"visual_prior_value":213.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1384","text_snippet":"234","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1429","text_snippet":"213","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":234,"prior_value":213.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":2021,"prior_period_value":1743.0,"visual_current_value":2021,"visual_prior_value":1743.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1547","text_snippet":"2,021","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1724","text_snippet":"1,743","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2021,"prior_value":1743.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":1679,"prior_period_value":1448.0,"visual_current_value":1679,"visual_prior_value":1448.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1358","text_snippet":"1,679","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1404","text_snippet":"1,448","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1679,"prior_value":1448.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":234,"prior_period_value":213.0,"visual_current_value":234,"visual_prior_value":213.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1359","text_snippet":"234","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1405","text_snippet":"213","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":234,"prior_value":213.0},{"tag":"us-gaap:Revenues","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":108,"prior_period_value":82.0,"visual_current_value":108,"visual_prior_value":82.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1360","text_snippet":"108","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1406","text_snippet":"82","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":108,"prior_value":82.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":6306,"prior_period_value":5526.0,"visual_current_value":6306,"visual_prior_value":5526.0,"end_current":"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-66","text_snippet":"6,306","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-67","text_snippet":"5,526","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6306,"prior_value":5526.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":6007,"prior_period_value":5291.0,"visual_current_value":6007,"visual_prior_value":5291.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-490","text_snippet":"6,007","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-491","text_snippet":"5,291","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6007,"prior_value":5291.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":6007,"prior_period_value":5291.0,"visual_current_value":6007,"visual_prior_value":5291.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-1990","text_snippet":"6,007","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2155","text_snippet":"5,291","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6007,"prior_value":5291.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":4337,"prior_period_value":3806.0,"visual_current_value":4337,"visual_prior_value":3806.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-1474","text_snippet":"4,337","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-1520","text_snippet":"3,806","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":4337,"prior_value":3806.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":1670,"prior_period_value":1485.0,"visual_current_value":1670,"visual_prior_value":1485.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-1475","text_snippet":"1,670","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-1521","text_snippet":"1,485","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1670,"prior_value":1485.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":6306,"prior_period_value":5526.0,"visual_current_value":6306,"visual_prior_value":5526.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1901","text_snippet":"6,306","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2066","text_snippet":"5,526","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6306,"prior_value":5526.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":4337,"prior_period_value":3806.0,"visual_current_value":4337,"visual_prior_value":3806.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1449","text_snippet":"4,337","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-1495","text_snippet":"3,806","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":4337,"prior_value":3806.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":1670,"prior_period_value":1485.0,"visual_current_value":1670,"visual_prior_value":1485.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1450","text_snippet":"1,670","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-1496","text_snippet":"1,485","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1670,"prior_value":1485.0},{"tag":"us-gaap:Revenues","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|regulatorymattersnarrativedetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails|revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","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},{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":8.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","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,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Revenues","current_period_value":299,"prior_period_value":235.0,"visual_current_value":299,"visual_prior_value":235.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1451","text_snippet":"299","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-1497","text_snippet":"235","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":299,"prior_value":235.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":340,"prior_period_value":273.0,"visual_current_value":340,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-140","text_snippet":"340","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-141","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":340,"prior_value":273.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":393,"prior_period_value":307.0,"visual_current_value":393,"visual_prior_value":307.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-564","text_snippet":"393","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-565","text_snippet":"307","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":393,"prior_value":307.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":394,"prior_period_value":307.0,"visual_current_value":394,"visual_prior_value":307.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1698","text_snippet":"394","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1875","text_snippet":"307","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":394,"prior_value":307.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":392,"prior_period_value":300.0,"visual_current_value":392,"visual_prior_value":300.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1696","text_snippet":"392","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1873","text_snippet":"300","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":392,"prior_value":300.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":2,"prior_period_value":7.0,"visual_current_value":2,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1697","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1874","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":7.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":-60,"prior_period_value":-28.0,"visual_current_value":-60,"visual_prior_value":-28.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1608","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1785","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-60,"prior_value":-28.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":400,"prior_period_value":301.0,"visual_current_value":400,"visual_prior_value":301.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1607","text_snippet":"400","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1784","text_snippet":"301","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":400,"prior_value":301.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":392,"prior_period_value":300.0,"visual_current_value":392,"visual_prior_value":300.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1604","text_snippet":"392","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1781","text_snippet":"300","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":392,"prior_value":300.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":2,"prior_period_value":7.0,"visual_current_value":2,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1605","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1782","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":7.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1606","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1783","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":-6.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":953,"prior_period_value":817.0,"visual_current_value":953,"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-1","char_anchor":"f-142","text_snippet":"953","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-143","text_snippet":"817","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":953,"prior_value":817.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":1069,"prior_period_value":865.0,"visual_current_value":1069,"visual_prior_value":865.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-566","text_snippet":"1,069","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-567","text_snippet":"865","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1069,"prior_value":865.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-2041","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-436","char_anchor":"f-2206","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-2.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":1070,"prior_period_value":867.0,"visual_current_value":1070,"visual_prior_value":867.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2040","text_snippet":"1,070","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2205","text_snippet":"867","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1070,"prior_value":867.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":749,"prior_period_value":615.0,"visual_current_value":749,"visual_prior_value":615.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2038","text_snippet":"749","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2203","text_snippet":"615","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":749,"prior_value":615.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":321,"prior_period_value":252.0,"visual_current_value":321,"visual_prior_value":252.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2039","text_snippet":"321","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2204","text_snippet":"252","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":321,"prior_value":252.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":-102,"prior_period_value":-53.0,"visual_current_value":-102,"visual_prior_value":-53.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1962","text_snippet":"102","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2127","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-102,"prior_value":-53.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":1055,"prior_period_value":870.0,"visual_current_value":1055,"visual_prior_value":870.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1961","text_snippet":"1,055","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2126","text_snippet":"870","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1055,"prior_value":870.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":749,"prior_period_value":615.0,"visual_current_value":749,"visual_prior_value":615.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1958","text_snippet":"749","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2123","text_snippet":"615","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":749,"prior_value":615.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":321,"prior_period_value":252.0,"visual_current_value":321,"visual_prior_value":252.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1959","text_snippet":"321","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2124","text_snippet":"252","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":321,"prior_value":252.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","current_period_value":-15,"prior_period_value":3.0,"visual_current_value":-15,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1960","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2125","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-15,"prior_value":3.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":6.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,6.0,5],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":11.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-396","char_anchor":"f-1699","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":68,"prior_period_value":26.0,"visual_current_value":68,"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-11","char_anchor":"f-144","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-145","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":68,"prior_value":26.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":79,"prior_period_value":34.0,"visual_current_value":79,"visual_prior_value":34.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-568","text_snippet":"79","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-569","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":79,"prior_value":34.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":11,"prior_period_value":11.0,"visual_current_value":11,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-396","char_anchor":"f-1704","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-414","char_anchor":"f-1881","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":11,"prior_value":11.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":68,"prior_period_value":23.0,"visual_current_value":68,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1703","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1880","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":68,"prior_value":23.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":66,"prior_period_value":27.0,"visual_current_value":66,"visual_prior_value":27.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1701","text_snippet":"66","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1878","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":66,"prior_value":27.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":2,"prior_period_value":-4.0,"visual_current_value":2,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1702","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1879","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-4.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":68,"prior_period_value":17.0,"visual_current_value":68,"visual_prior_value":17.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1613","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1790","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":68,"prior_value":17.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":66,"prior_period_value":27.0,"visual_current_value":66,"visual_prior_value":27.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1610","text_snippet":"66","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1787","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":66,"prior_value":27.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":2,"prior_period_value":-4.0,"visual_current_value":2,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1611","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1788","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":-4.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":193,"prior_period_value":125.0,"visual_current_value":193,"visual_prior_value":125.0,"end_current":"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-146","text_snippet":"193","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-147","text_snippet":"125","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":193,"prior_value":125.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":221,"prior_period_value":139.0,"visual_current_value":221,"visual_prior_value":139.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-570","text_snippet":"221","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-571","text_snippet":"139","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":221,"prior_value":139.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":7,"prior_period_value":8.0,"visual_current_value":7,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-2046","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-436","char_anchor":"f-2211","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":8.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":214,"prior_period_value":131.0,"visual_current_value":214,"visual_prior_value":131.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2045","text_snippet":"214","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2210","text_snippet":"131","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":214,"prior_value":131.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":131,"prior_period_value":74.0,"visual_current_value":131,"visual_prior_value":74.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2043","text_snippet":"131","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2208","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":131,"prior_value":74.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":83,"prior_period_value":57.0,"visual_current_value":83,"visual_prior_value":57.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2044","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2209","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":83,"prior_value":57.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","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:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1968","text_snippet":"14","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2133","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-14,"prior_value":-3.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":207,"prior_period_value":128.0,"visual_current_value":207,"visual_prior_value":128.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1967","text_snippet":"207","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2132","text_snippet":"128","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":207,"prior_value":128.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":131,"prior_period_value":74.0,"visual_current_value":131,"visual_prior_value":74.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1964","text_snippet":"131","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2129","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":131,"prior_value":74.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","current_period_value":83,"prior_period_value":57.0,"visual_current_value":83,"visual_prior_value":57.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1965","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2130","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":83,"prior_value":57.0},{"tag":"us-gaap:IncomeTaxExpenseBenefit","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,7.0,6],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:ProfitLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:ProfitLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":12.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Income Tax Expense (Benefit)","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1966","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2131","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-3.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":203,"prior_period_value":178.0,"visual_current_value":203,"visual_prior_value":178.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-136","text_snippet":"203","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-137","text_snippet":"178","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":203,"prior_value":178.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":145,"prior_period_value":131.0,"visual_current_value":145,"visual_prior_value":131.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-560","text_snippet":"145","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-561","text_snippet":"131","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":145,"prior_value":131.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":145,"prior_period_value":131.0,"visual_current_value":145,"visual_prior_value":131.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1693","text_snippet":"145","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1870","text_snippet":"131","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":145,"prior_value":131.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":92,"prior_period_value":82.0,"visual_current_value":92,"visual_prior_value":82.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1691","text_snippet":"92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1868","text_snippet":"82","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":92,"prior_value":82.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":53,"prior_period_value":49.0,"visual_current_value":53,"visual_prior_value":49.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1692","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1869","text_snippet":"49","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":53,"prior_value":49.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":59,"prior_period_value":45.0,"visual_current_value":59,"visual_prior_value":45.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1602","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1779","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":59,"prior_value":45.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":144,"prior_period_value":133.0,"visual_current_value":144,"visual_prior_value":133.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1601","text_snippet":"144","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1778","text_snippet":"133","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":144,"prior_value":133.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":92,"prior_period_value":82.0,"visual_current_value":92,"visual_prior_value":82.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1598","text_snippet":"92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1775","text_snippet":"82","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":92,"prior_value":82.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":53,"prior_period_value":49.0,"visual_current_value":53,"visual_prior_value":49.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1599","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1776","text_snippet":"49","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":53,"prior_value":49.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1600","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1777","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":2.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":588,"prior_period_value":528.0,"visual_current_value":588,"visual_prior_value":528.0,"end_current":"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-138","text_snippet":"588","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-139","text_snippet":"528","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":588,"prior_value":528.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":416,"prior_period_value":386.0,"visual_current_value":416,"visual_prior_value":386.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-562","text_snippet":"416","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-563","text_snippet":"386","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":416,"prior_value":386.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-2036","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-436","char_anchor":"f-2201","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":415,"prior_period_value":385.0,"visual_current_value":415,"visual_prior_value":385.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2035","text_snippet":"415","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2200","text_snippet":"385","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":415,"prior_value":385.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":263,"prior_period_value":242.0,"visual_current_value":263,"visual_prior_value":242.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2033","text_snippet":"263","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2198","text_snippet":"242","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":263,"prior_value":242.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":152,"prior_period_value":143.0,"visual_current_value":152,"visual_prior_value":143.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2034","text_snippet":"152","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2199","text_snippet":"143","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":152,"prior_value":143.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":175,"prior_period_value":140.0,"visual_current_value":175,"visual_prior_value":140.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1956","text_snippet":"175","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2121","text_snippet":"140","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":175,"prior_value":140.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":413,"prior_period_value":388.0,"visual_current_value":413,"visual_prior_value":388.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1955","text_snippet":"413","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2120","text_snippet":"388","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":413,"prior_value":388.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":263,"prior_period_value":242.0,"visual_current_value":263,"visual_prior_value":242.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1952","text_snippet":"263","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2117","text_snippet":"242","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":263,"prior_value":242.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","current_period_value":152,"prior_period_value":143.0,"visual_current_value":152,"visual_prior_value":143.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1953","text_snippet":"152","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2118","text_snippet":"143","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":152,"prior_value":143.0},{"tag":"us-gaap:InterestExpenseNonoperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:InterestExpenseAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,5.0,4,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Interest Expense, Nonoperating","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1954","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2119","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":3.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":275,"prior_period_value":251.0,"visual_current_value":275,"visual_prior_value":251.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-164","text_snippet":"275","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-165","text_snippet":"251","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":275,"prior_value":251.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":314,"prior_period_value":273.0,"visual_current_value":314,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-580","text_snippet":"314","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-581","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":314,"prior_value":273.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-396","char_anchor":"f-1709","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-414","char_anchor":"f-1886","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-12,"prior_value":-11.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":326,"prior_period_value":284.0,"visual_current_value":326,"visual_prior_value":284.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1708","text_snippet":"326","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1885","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":326,"prior_value":284.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":326,"prior_period_value":273.0,"visual_current_value":326,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1706","text_snippet":"326","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1883","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":326,"prior_value":273.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":-62,"prior_period_value":-39.0,"visual_current_value":-62,"visual_prior_value":-39.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1632","text_snippet":"62","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1809","text_snippet":"39","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-62,"prior_value":-39.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":337,"prior_period_value":290.0,"visual_current_value":337,"visual_prior_value":290.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1631","text_snippet":"337","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1808","text_snippet":"290","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":337,"prior_value":290.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":326,"prior_period_value":273.0,"visual_current_value":326,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1628","text_snippet":"326","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1805","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":326,"prior_value":273.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1630","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1807","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":11,"prior_value":6.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":775,"prior_period_value":731.0,"visual_current_value":775,"visual_prior_value":731.0,"end_current":"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-166","text_snippet":"775","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-167","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":775,"prior_value":731.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":847,"prior_period_value":725.0,"visual_current_value":847,"visual_prior_value":725.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-582","text_snippet":"847","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-583","text_snippet":"725","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":847,"prior_value":725.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":-8,"prior_period_value":-10.0,"visual_current_value":-8,"visual_prior_value":-10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-427","char_anchor":"f-2061","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-436","char_anchor":"f-2226","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":-10.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":855,"prior_period_value":735.0,"visual_current_value":855,"visual_prior_value":735.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2060","text_snippet":"855","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2225","text_snippet":"735","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":855,"prior_value":735.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":617,"prior_period_value":540.0,"visual_current_value":617,"visual_prior_value":540.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2058","text_snippet":"617","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2223","text_snippet":"540","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":617,"prior_value":540.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":238,"prior_period_value":195.0,"visual_current_value":238,"visual_prior_value":195.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2059","text_snippet":"238","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2224","text_snippet":"195","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":238,"prior_value":195.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":-95,"prior_period_value":-57.0,"visual_current_value":-95,"visual_prior_value":-57.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1986","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2151","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-95,"prior_value":-57.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":870,"prior_period_value":788.0,"visual_current_value":870,"visual_prior_value":788.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1985","text_snippet":"870","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2150","text_snippet":"788","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":870,"prior_value":788.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":617,"prior_period_value":540.0,"visual_current_value":617,"visual_prior_value":540.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1982","text_snippet":"617","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2147","text_snippet":"540","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":617,"prior_value":540.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":238,"prior_period_value":195.0,"visual_current_value":238,"visual_prior_value":195.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1983","text_snippet":"238","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2148","text_snippet":"195","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":238,"prior_value":195.0},{"tag":"us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":10.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,10.0,9],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,12.0,11],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":15.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Net Income (Loss) Available to Common Stockholders, Basic","current_period_value":15,"prior_period_value":53.0,"visual_current_value":15,"visual_prior_value":53.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1984","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2149","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":15,"prior_value":53.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":62,"prior_period_value":84.0,"visual_current_value":62,"visual_prior_value":84.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-116","text_snippet":"62","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-117","text_snippet":"84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":62,"prior_value":84.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":55,"prior_period_value":60.0,"visual_current_value":55,"visual_prior_value":60.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-540","text_snippet":"55","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-541","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":55,"prior_value":60.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":56,"prior_period_value":60.0,"visual_current_value":56,"visual_prior_value":60.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1688","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1865","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":56,"prior_value":60.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":34,"prior_period_value":35.0,"visual_current_value":34,"visual_prior_value":35.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1686","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1863","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":35.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":22,"prior_period_value":25.0,"visual_current_value":22,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1687","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1864","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":22,"prior_value":25.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":2,"prior_period_value":21.0,"visual_current_value":2,"visual_prior_value":21.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1596","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1773","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":21.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":60,"prior_period_value":63.0,"visual_current_value":60,"visual_prior_value":63.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1595","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1772","text_snippet":"63","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":63.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":34,"prior_period_value":35.0,"visual_current_value":34,"visual_prior_value":35.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1592","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1769","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":34,"prior_value":35.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":22,"prior_period_value":25.0,"visual_current_value":22,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1593","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1770","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":22,"prior_value":25.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1594","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1771","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":3.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":249,"prior_period_value":283.0,"visual_current_value":249,"visual_prior_value":283.0,"end_current":"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-118","text_snippet":"249","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-119","text_snippet":"283","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":249,"prior_value":283.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":161,"prior_period_value":175.0,"visual_current_value":161,"visual_prior_value":175.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-542","text_snippet":"161","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-543","text_snippet":"175","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":161,"prior_value":175.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":161,"prior_period_value":175.0,"visual_current_value":161,"visual_prior_value":175.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2030","text_snippet":"161","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2195","text_snippet":"175","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":161,"prior_value":175.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":97,"prior_period_value":105.0,"visual_current_value":97,"visual_prior_value":105.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2028","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2193","text_snippet":"105","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":97,"prior_value":105.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":64,"prior_period_value":70.0,"visual_current_value":64,"visual_prior_value":70.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2029","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2194","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":64,"prior_value":70.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":81,"prior_period_value":97.0,"visual_current_value":81,"visual_prior_value":97.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1950","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2115","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":81,"prior_value":97.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":168,"prior_period_value":186.0,"visual_current_value":168,"visual_prior_value":186.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1949","text_snippet":"168","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2114","text_snippet":"186","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":168,"prior_value":186.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":97,"prior_period_value":105.0,"visual_current_value":97,"visual_prior_value":105.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1946","text_snippet":"97","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2111","text_snippet":"105","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":97,"prior_value":105.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":64,"prior_period_value":70.0,"visual_current_value":64,"visual_prior_value":70.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1947","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2112","text_snippet":"70","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":64,"prior_value":70.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","current_period_value":7,"prior_period_value":11.0,"visual_current_value":7,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1948","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2113","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":11.0},{"tag":"us-gaap:NonoperatingIncomeExpense","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OtherIncomeAndExpensesAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,4.0,3,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Nonoperating Income (Expense)","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-396","char_anchor":"f-1689","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":481,"prior_period_value":367.0,"visual_current_value":481,"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-11","char_anchor":"f-100","text_snippet":"481","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-101","text_snippet":"367","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":481,"prior_value":367.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":483,"prior_period_value":378.0,"visual_current_value":483,"visual_prior_value":378.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-524","text_snippet":"483","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-525","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":483,"prior_value":378.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":483,"prior_period_value":378.0,"visual_current_value":483,"visual_prior_value":378.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1683","text_snippet":"483","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1860","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":483,"prior_value":378.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":450,"prior_period_value":347.0,"visual_current_value":450,"visual_prior_value":347.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1681","text_snippet":"450","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1858","text_snippet":"347","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":450,"prior_value":347.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":33,"prior_period_value":31.0,"visual_current_value":33,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1682","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1859","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":33,"prior_value":31.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":-3,"prior_period_value":-4.0,"visual_current_value":-3,"visual_prior_value":-4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1590","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1767","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-3,"prior_value":-4.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":484,"prior_period_value":371.0,"visual_current_value":484,"visual_prior_value":371.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1589","text_snippet":"484","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1766","text_snippet":"371","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":484,"prior_value":371.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":450,"prior_period_value":347.0,"visual_current_value":450,"visual_prior_value":347.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1586","text_snippet":"450","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1763","text_snippet":"347","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":450,"prior_value":347.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":33,"prior_period_value":31.0,"visual_current_value":33,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1587","text_snippet":"33","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1764","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":33,"prior_value":31.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1588","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1765","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":-7.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":1292,"prior_period_value":1062.0,"visual_current_value":1292,"visual_prior_value":1062.0,"end_current":"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-102","text_snippet":"1,292","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-103","text_snippet":"1,062","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1292,"prior_value":1062.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":1324,"prior_period_value":1076.0,"visual_current_value":1324,"visual_prior_value":1076.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-526","text_snippet":"1,324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-527","text_snippet":"1,076","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1324,"prior_value":1076.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":1324,"prior_period_value":1077.0,"visual_current_value":1324,"visual_prior_value":1077.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2025","text_snippet":"1,324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2190","text_snippet":"1,077","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1324,"prior_value":1077.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":915,"prior_period_value":752.0,"visual_current_value":915,"visual_prior_value":752.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2023","text_snippet":"915","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2188","text_snippet":"752","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":915,"prior_value":752.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":409,"prior_period_value":325.0,"visual_current_value":409,"visual_prior_value":325.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2024","text_snippet":"409","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2189","text_snippet":"325","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":409,"prior_value":325.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":-8,"prior_period_value":-10.0,"visual_current_value":-8,"visual_prior_value":-10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1944","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2109","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":-10.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":1300,"prior_period_value":1072.0,"visual_current_value":1300,"visual_prior_value":1072.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1943","text_snippet":"1,300","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2108","text_snippet":"1,072","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1300,"prior_value":1072.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":915,"prior_period_value":752.0,"visual_current_value":915,"visual_prior_value":752.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1940","text_snippet":"915","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2105","text_snippet":"752","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":915,"prior_value":752.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":409,"prior_period_value":325.0,"visual_current_value":409,"visual_prior_value":325.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1941","text_snippet":"409","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2106","text_snippet":"325","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":409,"prior_value":325.0},{"tag":"us-gaap:OperatingIncomeLoss","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null},{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","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":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","weight":1.0,"order":3.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest","calculation_weight":1.0,"calculation_order":3.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Operating Income (Loss)","current_period_value":-24,"prior_period_value":-5.0,"visual_current_value":-24,"visual_prior_value":-5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1942","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2107","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-24,"prior_value":-5.0},{"tag":"us-gaap:NetIncomeLossAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":-1.0,"order":2.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Net Income (Loss) Attributable to Noncontrolling Interest","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":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-152","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-153","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-5,"prior_value":-6.0},{"tag":"us-gaap:NetIncomeLossAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:StatementLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,9.0,8],"section_concept":null,"calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:NetIncomeLoss","weight":-1.0,"order":1.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:NetIncomeLoss","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":-1.0,"order":2.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Net Income (Loss) Attributable to Noncontrolling Interest","current_period_value":-22,"prior_period_value":-46.0,"visual_current_value":-22,"visual_prior_value":-46.0,"end_current":"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-154","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-155","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-22,"prior_value":-46.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":42,"prior_period_value":32.0,"visual_current_value":42,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-388","char_anchor":"f-1559","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-406","char_anchor":"f-1736","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":42,"prior_value":32.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":40,"prior_period_value":31.0,"visual_current_value":40,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-386","char_anchor":"f-1557","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-404","char_anchor":"f-1734","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":40,"prior_value":31.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-387","char_anchor":"f-1558","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-405","char_anchor":"f-1735","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":1.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":513,"prior_period_value":362.0,"visual_current_value":513,"visual_prior_value":362.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=us-gaap:ElectricityPurchasedMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:ElectricityPurchasedMember","member_label":"Electricity Purchased"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-14","char_anchor":"f-72","text_snippet":"513","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-15","char_anchor":"f-73","text_snippet":"362","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":513,"prior_value":362.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":42,"prior_period_value":32.0,"visual_current_value":42,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-18","char_anchor":"f-80","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-19","char_anchor":"f-81","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":42,"prior_value":32.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":549,"prior_period_value":449.0,"visual_current_value":549,"visual_prior_value":449.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-424","char_anchor":"f-1913","text_snippet":"549","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-433","char_anchor":"f-2078","text_snippet":"449","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":549,"prior_value":449.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":545,"prior_period_value":447.0,"visual_current_value":545,"visual_prior_value":447.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-422","char_anchor":"f-1911","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-431","char_anchor":"f-2076","text_snippet":"447","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":545,"prior_value":447.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":4,"prior_period_value":2.0,"visual_current_value":4,"visual_prior_value":2.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-423","char_anchor":"f-1912","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-432","char_anchor":"f-2077","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":2.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":1332,"prior_period_value":1025.0,"visual_current_value":1332,"visual_prior_value":1025.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=us-gaap:ElectricityPurchasedMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:ElectricityPurchasedMember","member_label":"Electricity Purchased"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-16","char_anchor":"f-74","text_snippet":"1,332","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-17","char_anchor":"f-75","text_snippet":"1,025","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1332,"prior_value":1025.0},{"tag":"us-gaap:CostOfGoodsAndServicesSold","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":4.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Cost of Product and Service Sold","current_period_value":549,"prior_period_value":449.0,"visual_current_value":549,"visual_prior_value":449.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=us-gaap:OilAndGasPurchasedMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"us-gaap:OilAndGasPurchasedMember","member_label":"Oil And Gas Purchased"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-20","char_anchor":"f-82","text_snippet":"549","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-21","char_anchor":"f-83","text_snippet":"449","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":549,"prior_value":449.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":1540,"prior_period_value":1376.0,"visual_current_value":1540,"visual_prior_value":1376.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-96","text_snippet":"1,540","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-97","text_snippet":"1,376","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1540,"prior_value":1376.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":3,"prior_period_value":4.0,"visual_current_value":3,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1584","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1761","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":4.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":1537,"prior_period_value":1372.0,"visual_current_value":1537,"visual_prior_value":1372.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1583","text_snippet":"1,537","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1760","text_snippet":"1,372","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1537,"prior_value":1372.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":1229,"prior_period_value":1101.0,"visual_current_value":1229,"visual_prior_value":1101.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1580","text_snippet":"1,229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1757","text_snippet":"1,101","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1229,"prior_value":1101.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":201,"prior_period_value":182.0,"visual_current_value":201,"visual_prior_value":182.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1581","text_snippet":"201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1758","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":201,"prior_value":182.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":107,"prior_period_value":89.0,"visual_current_value":107,"visual_prior_value":89.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1582","text_snippet":"107","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1759","text_snippet":"89","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":107,"prior_value":89.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":5014,"prior_period_value":4464.0,"visual_current_value":5014,"visual_prior_value":4464.0,"end_current":"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-98","text_snippet":"5,014","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-99","text_snippet":"4,464","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":5014,"prior_value":4464.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":8,"prior_period_value":10.0,"visual_current_value":8,"visual_prior_value":10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1938","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2103","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":10.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":5006,"prior_period_value":4454.0,"visual_current_value":5006,"visual_prior_value":4454.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1937","text_snippet":"5,006","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2102","text_snippet":"4,454","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":5006,"prior_value":4454.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":3422,"prior_period_value":3054.0,"visual_current_value":3422,"visual_prior_value":3054.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1934","text_snippet":"3,422","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2099","text_snippet":"3,054","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3422,"prior_value":3054.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":1261,"prior_period_value":1160.0,"visual_current_value":1261,"visual_prior_value":1160.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1935","text_snippet":"1,261","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2100","text_snippet":"1,160","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1261,"prior_value":1160.0},{"tag":"us-gaap:CostsAndExpenses","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingIncomeLoss","weight":-1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:OperatingIncomeLoss","calculation_weight":-1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Costs and Expenses","current_period_value":323,"prior_period_value":240.0,"visual_current_value":323,"visual_prior_value":240.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1936","text_snippet":"323","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2101","text_snippet":"240","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":323,"prior_value":240.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":416,"prior_period_value":412.0,"visual_current_value":416,"visual_prior_value":412.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-84","text_snippet":"416","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-85","text_snippet":"412","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":416,"prior_value":412.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":3,"prior_period_value":4.0,"visual_current_value":3,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1566","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1743","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":4.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":413,"prior_period_value":408.0,"visual_current_value":413,"visual_prior_value":408.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1565","text_snippet":"413","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1742","text_snippet":"408","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":413,"prior_value":408.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":285,"prior_period_value":282.0,"visual_current_value":285,"visual_prior_value":282.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1562","text_snippet":"285","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1739","text_snippet":"282","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":285,"prior_value":282.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":103,"prior_period_value":99.0,"visual_current_value":103,"visual_prior_value":99.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1563","text_snippet":"103","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1740","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":103,"prior_value":99.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":25,"prior_period_value":27.0,"visual_current_value":25,"visual_prior_value":27.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1564","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1741","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":25,"prior_value":27.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":1218,"prior_period_value":1218.0,"visual_current_value":1218,"visual_prior_value":1218.0,"end_current":"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-86","text_snippet":"1,218","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-87","text_snippet":"1,218","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1218,"prior_value":1218.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":8,"prior_period_value":9.0,"visual_current_value":8,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1920","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2085","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":9.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":1210,"prior_period_value":1209.0,"visual_current_value":1210,"visual_prior_value":1209.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1919","text_snippet":"1,210","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2084","text_snippet":"1,209","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1210,"prior_value":1209.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":806,"prior_period_value":781.0,"visual_current_value":806,"visual_prior_value":781.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1916","text_snippet":"806","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2081","text_snippet":"781","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":806,"prior_value":781.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":331,"prior_period_value":355.0,"visual_current_value":331,"visual_prior_value":355.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1917","text_snippet":"331","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2082","text_snippet":"355","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":331,"prior_value":355.0},{"tag":"us-gaap:OtherCostAndExpenseOperating","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":2.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Other Cost and Expense, Operating","current_period_value":73,"prior_period_value":73.0,"visual_current_value":73,"visual_prior_value":73.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1918","text_snippet":"73","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2083","text_snippet":"73","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":73,"prior_value":73.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":107,"prior_period_value":99.0,"visual_current_value":107,"visual_prior_value":99.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-92","text_snippet":"107","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-93","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":107,"prior_value":99.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":107,"prior_period_value":99.0,"visual_current_value":107,"visual_prior_value":99.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1577","text_snippet":"107","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1754","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":107,"prior_value":99.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":81,"prior_period_value":75.0,"visual_current_value":81,"visual_prior_value":75.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1574","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1751","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":81,"prior_value":75.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":23,"prior_period_value":20.0,"visual_current_value":23,"visual_prior_value":20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1575","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1752","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":23,"prior_value":20.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"Q","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":3,"prior_period_value":4.0,"visual_current_value":3,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1576","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1753","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":4.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":378,"prior_period_value":356.0,"visual_current_value":378,"visual_prior_value":356.0,"end_current":"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-94","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-95","text_snippet":"356","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":378,"prior_value":356.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":378,"prior_period_value":356.0,"visual_current_value":378,"visual_prior_value":356.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1931","text_snippet":"378","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2096","text_snippet":"356","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":378,"prior_value":356.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":227,"prior_period_value":214.0,"visual_current_value":227,"visual_prior_value":214.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1928","text_snippet":"227","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2093","text_snippet":"214","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":227,"prior_value":214.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":142,"prior_period_value":132.0,"visual_current_value":142,"visual_prior_value":132.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1929","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2094","text_snippet":"132","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":142,"prior_value":132.0},{"tag":"us-gaap:TaxesExcludingIncomeAndExciseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","parent":"us-gaap:CostsAndExpenses","weight":1.0,"order":5.0}],"calculation_role":"cmsenergycorporationconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:CostsAndExpenses","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Taxes, Miscellaneous","current_period_value":9,"prior_period_value":10.0,"visual_current_value":9,"visual_prior_value":10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1930","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2095","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":9,"prior_value":10.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Public Utilities, Property, Plant And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization","current_period_value":27781,"prior_period_value":25275.0,"visual_current_value":27781,"visual_prior_value":25275.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-688","text_snippet":"27,781","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-710","text_snippet":"25,275","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":27781,"prior_value":25275.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Public Utilities Property Plant And Equipment Net Excluding C W I P","current_period_value":25249,"prior_period_value":23630.0,"visual_current_value":25249,"visual_prior_value":23630.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-684","text_snippet":"25,249","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-706","text_snippet":"23,630","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":25249,"prior_value":23630.0},{"tag":"cms:PublicUtilitiesPropertyPlantandEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":-1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":-1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Less accumulated depreciation and amortization","current_period_value":9772,"prior_period_value":9065.0,"visual_current_value":9772,"visual_prior_value":9065.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-682","text_snippet":"9,772","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-704","text_snippet":"9,065","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":9772,"prior_value":9065.0},{"tag":"us-gaap:AccountsNotesAndLoansReceivableNetCurrent","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:AssetsCurrentAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0,4.0,3],"section_concept":"us-gaap:AssetsCurrentAbstract","section_label":"Current Assets"}],"concept_label":"Accounts and Financing Receivable, after Allowance for Credit Loss, Current","current_period_value":10,"prior_period_value":11.0,"visual_current_value":10,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-664","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-121","char_anchor":"f-686","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":11.0},{"tag":"us-gaap:AccountsReceivableNetNoncurrent","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:RegulatedEntityOtherAssetsNoncurrentAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Accounts Receivable, after Allowance for Credit Loss, Noncurrent","current_period_value":24,"prior_period_value":26.0,"visual_current_value":24,"visual_prior_value":26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-107","char_anchor":"f-692","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-119","char_anchor":"f-714","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":24,"prior_value":26.0},{"tag":"us-gaap:PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Public Utilities, Property, Plant and Equipment, Construction Work in Progress","current_period_value":2532,"prior_period_value":1645.0,"visual_current_value":2532,"visual_prior_value":1645.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-686","text_snippet":"2,532","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-708","text_snippet":"1,645","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2532,"prior_value":1645.0},{"tag":"us-gaap:PreferredStockParOrStatedValuePerShare","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunauditedparenthetical","parent":"us-gaap:StatementLineItems","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":"Preferred Stock, Par or Stated Value Per Share","current_period_value":4.5,"prior_period_value":4.5,"visual_current_value":4.5,"visual_prior_value":4.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-761","text_snippet":"4.50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-783","text_snippet":"4.50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":4.5,"prior_value":4.5},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":35021,"prior_period_value":32695.0,"visual_current_value":35021,"visual_prior_value":32695.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-680","text_snippet":"35,021","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-106","char_anchor":"f-1892","text_snippet":"32,695","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":35021,"prior_value":32695.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":36,"prior_period_value":29.0,"visual_current_value":36,"visual_prior_value":29.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-400","char_anchor":"f-1714","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-418","char_anchor":"f-1891","text_snippet":"29","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":36,"prior_value":29.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":34985,"prior_period_value":32666.0,"visual_current_value":34985,"visual_prior_value":32666.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1713","text_snippet":"34,985","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-417","char_anchor":"f-1890","text_snippet":"32,666","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":34985,"prior_value":32666.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":21095,"prior_period_value":19826.0,"visual_current_value":21095,"visual_prior_value":19826.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-397","char_anchor":"f-1711","text_snippet":"21,095","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-415","char_anchor":"f-1888","text_snippet":"19,826","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":21095,"prior_value":19826.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":13890,"prior_period_value":12840.0,"visual_current_value":13890,"visual_prior_value":12840.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-398","char_anchor":"f-1712","text_snippet":"13,890","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-416","char_anchor":"f-1889","text_snippet":"12,840","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":13890,"prior_value":12840.0},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":35021,"prior_period_value":null,"visual_current_value":35021,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-680","text_snippet":"35,021","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":35021,"prior_value":null},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":21095,"prior_period_value":null,"visual_current_value":21095,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-397","char_anchor":"f-1711","text_snippet":"21,095","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":21095,"prior_value":null},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":13890,"prior_period_value":null,"visual_current_value":13890,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-398","char_anchor":"f-1712","text_snippet":"13,890","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":13890,"prior_value":null},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":34985,"prior_period_value":null,"visual_current_value":34985,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-399","char_anchor":"f-1713","text_snippet":"34,985","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":34985,"prior_value":null},{"tag":"cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress","date_type":"Q","period_type":"instant","presentation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"us-gaap:PropertyPlantAndEquipmentGrossAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedbalancesheetsunaudited","calculation_parent":"cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Property, plant, and equipment, gross","current_period_value":36,"prior_period_value":null,"visual_current_value":36,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-400","char_anchor":"f-1714","text_snippet":"36","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":36,"prior_value":null},{"tag":"us-gaap:PaymentsOfOrdinaryDividends","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","order":6.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,2.0,1,3.0,2,6.0,5],"section_concept":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"}],"concept_label":"Payments of Ordinary Dividends","current_period_value":650,"prior_period_value":545.0,"visual_current_value":-650,"visual_prior_value":-545.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-642","text_snippet":"650","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-643","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-650,"prior_value":-545.0},{"tag":"us-gaap:ProceedsFromContributedCapital","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","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":"us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract","section_label":"Financing Activities"}],"concept_label":"Proceeds from Contributed Capital","current_period_value":695,"prior_period_value":320.0,"visual_current_value":695,"visual_prior_value":320.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-638","text_snippet":"695","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-639","text_snippet":"320","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":695,"prior_value":320.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":274,"prior_period_value":261.0,"visual_current_value":274,"visual_prior_value":261.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-512","text_snippet":"274","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-513","text_snippet":"261","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":274,"prior_value":261.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":274,"prior_period_value":261.0,"visual_current_value":274,"visual_prior_value":261.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1668","text_snippet":"274","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1845","text_snippet":"261","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":274,"prior_value":261.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":239,"prior_period_value":229.0,"visual_current_value":239,"visual_prior_value":229.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1666","text_snippet":"239","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1843","text_snippet":"229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":239,"prior_value":229.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":35,"prior_period_value":32.0,"visual_current_value":35,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1667","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1844","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":32.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":925,"prior_period_value":878.0,"visual_current_value":925,"visual_prior_value":878.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-514","text_snippet":"925","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-515","text_snippet":"878","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":925,"prior_value":878.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":925,"prior_period_value":877.0,"visual_current_value":925,"visual_prior_value":877.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2010","text_snippet":"925","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2175","text_snippet":"877","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":925,"prior_value":877.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":682,"prior_period_value":651.0,"visual_current_value":682,"visual_prior_value":651.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2008","text_snippet":"682","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2173","text_snippet":"651","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":682,"prior_value":651.0},{"tag":"us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited|consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":6.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":6.0,"section_label":"Operating Expenses"},{"role":"consumersenergycompanyconsolidatedstatementsofcashflowsunaudited","parent":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1,1.0,0],"section_concept":"us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract","section_label":"Operating Activities"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Depreciation and Amortization","current_period_value":243,"prior_period_value":226.0,"visual_current_value":243,"visual_prior_value":226.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2009","text_snippet":"243","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2174","text_snippet":"226","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":243,"prior_value":226.0},{"tag":"cms:AdjustmentsToAdditionalPaidInCapitalStockholderContribution","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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,"section_label":null}],"concept_label":"Stockholder contribution","current_period_value":695,"prior_period_value":320.0,"visual_current_value":695,"visual_prior_value":320.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-125","char_anchor":"f-790","text_snippet":"695","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-126","char_anchor":"f-791","text_snippet":"320","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":695,"prior_value":320.0},{"tag":"cms:AdjustmentsToAdditionalPaidInCapitalStockholderContribution","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofchangesinequityunaudited","parent":"us-gaap:IncreaseDecreaseInStockholdersEquityRollForward","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,"section_label":null}],"concept_label":"Stockholder contribution","current_period_value":545,"prior_period_value":null,"visual_current_value":545,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:StatementEquityComponentsAxis=us-gaap:AdditionalPaidInCapitalMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-123","char_anchor":"f-788","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":545,"prior_value":null},{"tag":"cms:UtilitiesOperatingExpensePurchasedPowerRelatedParties","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":3.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"}],"concept_label":"Purchased power – related parties","current_period_value":21,"prior_period_value":19.0,"visual_current_value":21,"visual_prior_value":19.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-500","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-501","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":21,"prior_value":19.0},{"tag":"cms:UtilitiesOperatingExpensePurchasedPowerRelatedParties","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":3.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Operating Expenses"}],"concept_label":"Purchased power – related parties","current_period_value":69,"prior_period_value":53.0,"visual_current_value":69,"visual_prior_value":53.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-502","text_snippet":"69","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-503","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":69,"prior_value":53.0},{"tag":"us-gaap:UtilitiesOperatingExpenseFuelUsed","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Expenses"}],"concept_label":"Utilities Operating Expense, Fuel Used","current_period_value":113,"prior_period_value":150.0,"visual_current_value":113,"visual_prior_value":150.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-492","text_snippet":"113","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-493","text_snippet":"150","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":113,"prior_value":150.0},{"tag":"us-gaap:UtilitiesOperatingExpenseFuelUsed","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":1.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Operating Expenses"}],"concept_label":"Utilities Operating Expense, Fuel Used","current_period_value":419,"prior_period_value":366.0,"visual_current_value":419,"visual_prior_value":366.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-494","text_snippet":"419","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-495","text_snippet":"366","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":419,"prior_value":366.0},{"tag":"us-gaap:UtilitiesOperatingExpensePurchasedPower","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"}],"concept_label":"Utilities Operating Expense, Purchased Power","current_period_value":490,"prior_period_value":346.0,"visual_current_value":490,"visual_prior_value":346.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-496","text_snippet":"490","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-497","text_snippet":"346","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":490,"prior_value":346.0},{"tag":"us-gaap:UtilitiesOperatingExpensePurchasedPower","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":2.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Operating Expenses"}],"concept_label":"Utilities Operating Expense, Purchased Power","current_period_value":1219,"prior_period_value":989.0,"visual_current_value":1219,"visual_prior_value":989.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-498","text_snippet":"1,219","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-499","text_snippet":"989","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1219,"prior_value":989.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":1430,"prior_period_value":1283.0,"visual_current_value":1430,"visual_prior_value":1283.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-520","text_snippet":"1,430","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-521","text_snippet":"1,283","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1430,"prior_value":1283.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":1430,"prior_period_value":1283.0,"visual_current_value":1430,"visual_prior_value":1283.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1678","text_snippet":"1,430","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1855","text_snippet":"1,283","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1430,"prior_value":1283.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":1229,"prior_period_value":1101.0,"visual_current_value":1229,"visual_prior_value":1101.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1676","text_snippet":"1,229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1853","text_snippet":"1,101","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1229,"prior_value":1101.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":201,"prior_period_value":182.0,"visual_current_value":201,"visual_prior_value":182.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1677","text_snippet":"201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1854","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":201,"prior_value":182.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":4683,"prior_period_value":4215.0,"visual_current_value":4683,"visual_prior_value":4215.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-522","text_snippet":"4,683","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-523","text_snippet":"4,215","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4683,"prior_value":4215.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":4683,"prior_period_value":4214.0,"visual_current_value":4683,"visual_prior_value":4214.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2020","text_snippet":"4,683","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2185","text_snippet":"4,214","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4683,"prior_value":4214.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":3422,"prior_period_value":3054.0,"visual_current_value":3422,"visual_prior_value":3054.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2018","text_snippet":"3,422","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2183","text_snippet":"3,054","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3422,"prior_value":3054.0},{"tag":"us-gaap:UtilitiesOperatingExpense","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":8.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,8.0,7],"section_concept":"us-gaap:OperatingExpensesAbstract","section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":7.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense","current_period_value":1261,"prior_period_value":1160.0,"visual_current_value":1261,"visual_prior_value":1160.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2019","text_snippet":"1,261","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2184","text_snippet":"1,160","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1261,"prior_value":1160.0},{"tag":"us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":4.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Gas and Petroleum Purchased","current_period_value":40,"prior_period_value":31.0,"visual_current_value":40,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-504","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-505","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":40,"prior_value":31.0},{"tag":"us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":4.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Gas and Petroleum Purchased","current_period_value":40,"prior_period_value":31.0,"visual_current_value":40,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1658","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1835","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":40,"prior_value":31.0},{"tag":"us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":4.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Gas and Petroleum Purchased","current_period_value":40,"prior_period_value":31.0,"visual_current_value":40,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1657","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1834","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":40,"prior_value":31.0},{"tag":"us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":4.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Gas and Petroleum Purchased","current_period_value":545,"prior_period_value":447.0,"visual_current_value":545,"visual_prior_value":447.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-506","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-507","text_snippet":"447","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":545,"prior_value":447.0},{"tag":"us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":4.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Gas and Petroleum Purchased","current_period_value":545,"prior_period_value":447.0,"visual_current_value":545,"visual_prior_value":447.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2000","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2165","text_snippet":"447","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":545,"prior_value":447.0},{"tag":"us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":4.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":4.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Gas and Petroleum Purchased","current_period_value":545,"prior_period_value":447.0,"visual_current_value":545,"visual_prior_value":447.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-1999","text_snippet":"545","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2164","text_snippet":"447","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":545,"prior_value":447.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":388,"prior_period_value":381.0,"visual_current_value":388,"visual_prior_value":381.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-508","text_snippet":"388","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-509","text_snippet":"381","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":388,"prior_value":381.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":388,"prior_period_value":381.0,"visual_current_value":388,"visual_prior_value":381.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1663","text_snippet":"388","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1840","text_snippet":"381","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":388,"prior_value":381.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":285,"prior_period_value":282.0,"visual_current_value":285,"visual_prior_value":282.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1661","text_snippet":"285","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1838","text_snippet":"282","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":285,"prior_value":282.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":103,"prior_period_value":99.0,"visual_current_value":103,"visual_prior_value":99.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1662","text_snippet":"103","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1839","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":103,"prior_value":99.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":1137,"prior_period_value":1136.0,"visual_current_value":1137,"visual_prior_value":1136.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-510","text_snippet":"1,137","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-511","text_snippet":"1,136","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1137,"prior_value":1136.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":1137,"prior_period_value":1136.0,"visual_current_value":1137,"visual_prior_value":1136.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2005","text_snippet":"1,137","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2170","text_snippet":"1,136","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1137,"prior_value":1136.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":806,"prior_period_value":781.0,"visual_current_value":806,"visual_prior_value":781.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2003","text_snippet":"806","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2168","text_snippet":"781","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":806,"prior_value":781.0},{"tag":"us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","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":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":5.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":5.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","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":"Utilities Operating Expense, Maintenance and Operations","current_period_value":331,"prior_period_value":355.0,"visual_current_value":331,"visual_prior_value":355.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2004","text_snippet":"331","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2169","text_snippet":"355","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":331,"prior_value":355.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":104,"prior_period_value":95.0,"visual_current_value":104,"visual_prior_value":95.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-516","text_snippet":"104","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-517","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":104,"prior_value":95.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":104,"prior_period_value":95.0,"visual_current_value":104,"visual_prior_value":95.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1673","text_snippet":"104","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1850","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":104,"prior_value":95.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":81,"prior_period_value":75.0,"visual_current_value":81,"visual_prior_value":75.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1671","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1848","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":81,"prior_value":75.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"Q","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":23,"prior_period_value":20.0,"visual_current_value":23,"visual_prior_value":20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1672","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1849","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":23,"prior_value":20.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":369,"prior_period_value":346.0,"visual_current_value":369,"visual_prior_value":346.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-518","text_snippet":"369","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-519","text_snippet":"346","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":369,"prior_value":346.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":369,"prior_period_value":346.0,"visual_current_value":369,"visual_prior_value":346.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2015","text_snippet":"369","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2180","text_snippet":"346","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":369,"prior_value":346.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":227,"prior_period_value":214.0,"visual_current_value":227,"visual_prior_value":214.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2013","text_snippet":"227","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2178","text_snippet":"214","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":227,"prior_value":214.0},{"tag":"us-gaap:UtilitiesOperatingExpenseTaxes","date_type":"YTD","period_type":"duration","presentation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:OperatingExpensesAbstract","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,7.0,6],"section_concept":"us-gaap:OperatingExpensesAbstract","calculation_relationships":[{"role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","parent":"us-gaap:UtilitiesOperatingExpense","weight":1.0,"order":7.0}],"calculation_role":"consumersenergycompanyconsolidatedstatementsofincomeunaudited","calculation_parent":"us-gaap:UtilitiesOperatingExpense","calculation_weight":1.0,"calculation_order":7.0,"section_label":"Operating Expenses"},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Utilities Operating Expense, Taxes","current_period_value":142,"prior_period_value":132.0,"visual_current_value":142,"visual_prior_value":132.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-2014","text_snippet":"142","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-2179","text_snippet":"132","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":142,"prior_value":132.0},{"tag":"cms:AccrualForEnvironmentalLossContingenciesInflationRate","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Accrual for environmental loss contingencies, inflation rate","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:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-863","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"hundredths","current_value":1,"prior_value":null},{"tag":"cms:NumberOfFormerManufacturedGasPlants","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Number of former MGPs","current_period_value":23,"prior_period_value":23.0,"visual_current_value":23,"visual_prior_value":23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-173","char_anchor":"f-881","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-182","char_anchor":"f-900","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"units","current_value":23,"prior_value":23.0},{"tag":"cms:RegulatoryAssetEstimateOfSharedCosts","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":8.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,8.0,7],"section_concept":null,"section_label":null}],"concept_label":"Estimate of shared costs","current_period_value":350,"prior_period_value":350.0,"visual_current_value":350,"visual_prior_value":350.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:LitigationCaseAxis=cms:LudingtonPlantOverhaulContractDisputeMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:LitigationCaseAxis","axis_label":"Litigation Case","member":"cms:LudingtonPlantOverhaulContractDisputeMember","member_label":"Ludington Plant Overhaul Contract Dispute"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-172","char_anchor":"f-880","text_snippet":"350","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-180","char_anchor":"f-898","text_snippet":"350","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":350,"prior_value":350.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingencies","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingencies","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:CerclaLiabilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:CerclaLiabilityMember","member_label":"CERCLA Liability"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-169","char_anchor":"f-877","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-177","char_anchor":"f-895","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingencies","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingencies","current_period_value":60,"prior_period_value":61.0,"visual_current_value":60,"visual_prior_value":61.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-173","char_anchor":"f-883","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-182","char_anchor":"f-902","text_snippet":"61","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":60,"prior_value":61.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingencies","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingencies","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:NrepaMember|us-gaap:PublicUtilityAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:NrepaMember","member_label":"NREPA"},{"axis":"us-gaap:PublicUtilityAxis","axis_label":"Public Utility","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-166","char_anchor":"f-874","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-174","char_anchor":"f-892","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingencies","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingencies","current_period_value":47,"prior_period_value":43.0,"visual_current_value":47,"visual_prior_value":43.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-861","text_snippet":"47","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-879","text_snippet":"43","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":47,"prior_value":43.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesDiscountRate","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingencies, Discount Rate","current_period_value":4.34,"prior_period_value":4.34,"visual_current_value":4.34,"visual_prior_value":4.34,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-862","text_snippet":"4.34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-880","text_snippet":"4.34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":4.34,"prior_value":4.34},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesGross","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingencies, Gross","current_period_value":59,"prior_period_value":54.0,"visual_current_value":59,"visual_prior_value":54.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-864","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-882","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":59,"prior_value":54.0},{"tag":"us-gaap:JointlyOwnedUtilityPlantProportionateOwnershipShare","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Jointly Owned Utility Plant, Proportionate Ownership Share","current_period_value":51,"prior_period_value":51.0,"visual_current_value":51,"visual_prior_value":51.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:JointlyOwnedUtilityPlantAxis=cms:LudingtonMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:JointlyOwnedUtilityPlantAxis","axis_label":"Jointly Owned Utility Plant","member":"cms:LudingtonMember","member_label":"Ludington"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-171","char_anchor":"f-879","text_snippet":"51","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-179","char_anchor":"f-897","text_snippet":"51","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":51,"prior_value":51.0},{"tag":"us-gaap:LossContingencyEstimateOfPossibleLoss","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Loss Contingency, Estimate of Possible Loss","current_period_value":8,"prior_period_value":8.0,"visual_current_value":8,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:RangeAxis=srt:MaximumMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:CerclaLiabilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:RangeAxis","axis_label":"Range","member":"srt:MaximumMember","member_label":"Maximum"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:CerclaLiabilityMember","member_label":"CERCLA Liability"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-168","char_anchor":"f-876","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-176","char_anchor":"f-894","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":8.0},{"tag":"us-gaap:LossContingencyEstimateOfPossibleLoss","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Loss Contingency, Estimate of Possible Loss","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:RangeAxis=srt:MaximumMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:NrepaMember|us-gaap:PublicUtilityAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:RangeAxis","axis_label":"Range","member":"srt:MaximumMember","member_label":"Maximum"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:NrepaMember","member_label":"NREPA"},{"axis":"us-gaap:PublicUtilityAxis","axis_label":"Public Utility","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-165","char_anchor":"f-873","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-173","char_anchor":"f-891","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":5.0},{"tag":"us-gaap:LossContingencyEstimateOfPossibleLoss","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Loss Contingency, Estimate of Possible 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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:RangeAxis=srt:MinimumMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:CerclaLiabilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:RangeAxis","axis_label":"Range","member":"srt:MinimumMember","member_label":"Minimum"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:CerclaLiabilityMember","member_label":"CERCLA Liability"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-167","char_anchor":"f-875","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-175","char_anchor":"f-893","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:LossContingencyEstimateOfPossibleLoss","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsnarrativedetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsnarrativedetails","parent":"us-gaap:LossContingenciesLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Loss Contingency, Estimate of Possible Loss","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:RangeAxis=srt:MinimumMember|us-gaap:EnvironmentalRemediationSiteAxis=cms:NrepaMember|us-gaap:PublicUtilityAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:RangeAxis","axis_label":"Range","member":"srt:MinimumMember","member_label":"Minimum"},{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:NrepaMember","member_label":"NREPA"},{"axis":"us-gaap:PublicUtilityAxis","axis_label":"Public Utility","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-164","char_anchor":"f-872","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-172","char_anchor":"f-890","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":6.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Five","current_period_value":3,"prior_period_value":7.0,"visual_current_value":3,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationContingencyAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationContingencyAxis","axis_label":"Environmental Remediation Contingency","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-174","char_anchor":"f-890","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-183","char_anchor":"f-909","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":7.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":6.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Five","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-871","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-889","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Four","current_period_value":11,"prior_period_value":24.0,"visual_current_value":11,"visual_prior_value":24.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationContingencyAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationContingencyAxis","axis_label":"Environmental Remediation Contingency","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-174","char_anchor":"f-889","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-183","char_anchor":"f-908","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":11,"prior_value":24.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":5.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Four","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-870","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-888","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInRemainderOfFiscalYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","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":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Remainder of Fiscal Year","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:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-866","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-884","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Two","current_period_value":8,"prior_period_value":7.0,"visual_current_value":8,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationContingencyAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationContingencyAxis","axis_label":"Environmental Remediation Contingency","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-174","char_anchor":"f-887","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-183","char_anchor":"f-906","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":7.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":3.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Two","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-868","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-886","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Three","current_period_value":25,"prior_period_value":9.0,"visual_current_value":25,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationContingencyAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationContingencyAxis","axis_label":"Environmental Remediation Contingency","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-174","char_anchor":"f-888","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-183","char_anchor":"f-907","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":25,"prior_value":9.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Three","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-869","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-887","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year One","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:EnvironmentalRemediationContingencyAxis=cms:ManufacturedGasPlantMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:EnvironmentalRemediationContingencyAxis","axis_label":"Environmental Remediation Contingency","member":"cms:ManufacturedGasPlantMember","member_label":"MGP sites"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-174","char_anchor":"f-886","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-183","char_anchor":"f-905","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentsscheduleofremediationandotherresponseactivitycostsbyyeardetails","parent":"us-gaap:SiteContingencyLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,4.0,3,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year One","current_period_value":4,"prior_period_value":4.0,"visual_current_value":4,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:EnvironmentalRemediationSiteAxis=cms:BayHarborMember","dimensions":[{"axis":"us-gaap:EnvironmentalRemediationSiteAxis","axis_label":"Environmental Remediation Site","member":"cms:BayHarborMember","member_label":"Bay Harbor"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-163","char_anchor":"f-867","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-171","char_anchor":"f-885","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":4.0},{"tag":"us-gaap:GuaranteeObligationsMaximumExposure","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentssummaryofguaranteesdetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentssummaryofguaranteesdetails","parent":"cms:GuaranteesAndOtherContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Guarantor Obligations, Maximum Exposure, Undiscounted","current_period_value":30,"prior_period_value":30.0,"visual_current_value":30,"visual_prior_value":30.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:GuaranteeObligationsByNatureAxis=us-gaap:GuaranteeTypeOtherMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:GuaranteeObligationsByNatureAxis","axis_label":"Guarantee Obligations By Nature","member":"us-gaap:GuaranteeTypeOtherMember","member_label":"Guarantee Type Other"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-179","char_anchor":"f-901","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-188","char_anchor":"f-920","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":30.0},{"tag":"us-gaap:GuaranteeObligationsMaximumExposure","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentssummaryofguaranteesdetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentssummaryofguaranteesdetails","parent":"cms:GuaranteesAndOtherContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Guarantor Obligations, Maximum Exposure, Undiscounted","current_period_value":30,"prior_period_value":30.0,"visual_current_value":30,"visual_prior_value":30.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:GuaranteeObligationsByNatureAxis=us-gaap:GuaranteeTypeOtherMember","dimensions":[{"axis":"us-gaap:GuaranteeObligationsByNatureAxis","axis_label":"Guarantee Obligations By Nature","member":"us-gaap:GuaranteeTypeOtherMember","member_label":"Guarantee Type Other"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-178","char_anchor":"f-899","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-187","char_anchor":"f-918","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":30.0},{"tag":"us-gaap:GuaranteeObligationsMaximumExposure","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentssummaryofguaranteesdetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentssummaryofguaranteesdetails","parent":"cms:GuaranteesAndOtherContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Guarantor Obligations, Maximum Exposure, Undiscounted","current_period_value":229,"prior_period_value":271.0,"visual_current_value":229,"visual_prior_value":271.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:LossContingenciesByNatureOfContingencyAxis=cms:IndemnificationAgreementFromSaleOfMembershipInterestsInVIEsMember","dimensions":[{"axis":"us-gaap:LossContingenciesByNatureOfContingencyAxis","axis_label":"Loss Contingencies By Nature Of Contingency","member":"cms:IndemnificationAgreementFromSaleOfMembershipInterestsInVIEsMember","member_label":"Indemnity obligations from sale of membership interests in VIEs"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-176","char_anchor":"f-895","text_snippet":"229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-185","char_anchor":"f-914","text_snippet":"271","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":229,"prior_value":271.0},{"tag":"us-gaap:GuaranteeObligationsMaximumExposure","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentssummaryofguaranteesdetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentssummaryofguaranteesdetails","parent":"cms:GuaranteesAndOtherContingenciesLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Guarantor Obligations, Maximum Exposure, Undiscounted","current_period_value":152,"prior_period_value":153.0,"visual_current_value":152,"visual_prior_value":153.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:LossContingenciesByNatureOfContingencyAxis=us-gaap:IndemnificationGuaranteeMember","dimensions":[{"axis":"us-gaap:LossContingenciesByNatureOfContingencyAxis","axis_label":"Loss Contingencies By Nature Of Contingency","member":"us-gaap:IndemnificationGuaranteeMember","member_label":"Indemnification Guarantee"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-177","char_anchor":"f-897","text_snippet":"152","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-186","char_anchor":"f-916","text_snippet":"153","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":152,"prior_value":153.0},{"tag":"us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners","date_type":"Q","period_type":"instant","presentation_role":"contingenciesandcommitmentssummaryofguaranteesdetails","presentation_hierarchy":[{"role":"contingenciesandcommitmentssummaryofguaranteesdetails","parent":"cms:GuaranteesAndOtherContingenciesLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Subsidiary, Ownership Percentage, Noncontrolling Owner","current_period_value":49,"prior_period_value":null,"visual_current_value":49,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:AviatorWindEquityHoldingsMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:AviatorWindEquityHoldingsMember","member_label":"Aviator Wind Equity Holdings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-180","char_anchor":"f-903","text_snippet":"49","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"hundredths","current_value":49,"prior_value":null},{"tag":"dei:CityAreaCode","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"City Area Code","current_period_value":517,"prior_period_value":517.0,"visual_current_value":517,"visual_prior_value":517.0,"end_current":"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-13","text_snippet":"517","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-1","char_anchor":"f-13","text_snippet":"517","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":517,"prior_value":517.0},{"tag":"dei:CityAreaCode","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":14.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"City Area Code","current_period_value":517,"prior_period_value":517.0,"visual_current_value":517,"visual_prior_value":517.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-23","text_snippet":"517","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-2","char_anchor":"f-23","text_snippet":"517","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":517,"prior_value":517.0},{"tag":"dei:DocumentFiscalYearFocus","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":27.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,27.0,26],"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-59","text_snippet":"2025","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-1","char_anchor":"f-59","text_snippet":"2024","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":2025,"prior_value":2024.0},{"tag":"dei:EntityAddressPostalZipCode","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Entity Address Postal Zip Code","current_period_value":49201,"prior_period_value":49201.0,"visual_current_value":49201,"visual_prior_value":49201.0,"end_current":"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":"49201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-1","char_anchor":"f-12","text_snippet":"49201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":49201,"prior_value":49201.0},{"tag":"dei:EntityAddressPostalZipCode","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,13.0,12],"section_concept":null,"section_label":null}],"concept_label":"Entity Address Postal Zip Code","current_period_value":49201,"prior_period_value":49201.0,"visual_current_value":49201,"visual_prior_value":49201.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-22","text_snippet":"49201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-2","char_anchor":"f-22","text_snippet":"49201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":49201,"prior_value":49201.0},{"tag":"dei:EntityCentralIndexKey","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":26.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,26.0,25],"section_concept":null,"section_label":null}],"concept_label":"Entity Central Index Key","current_period_value":811156,"prior_period_value":811156.0,"visual_current_value":811156,"visual_prior_value":811156.0,"end_current":"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-58","text_snippet":"0000811156","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-1","char_anchor":"f-58","text_snippet":"0000811156","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":811156,"prior_value":811156.0},{"tag":"dei:EntityCentralIndexKey","date_type":"YTD","period_type":"duration","presentation_role":"coverpage","presentation_hierarchy":[{"role":"coverpage","parent":"dei:DocumentInformationLineItems","order":26.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,26.0,25],"section_concept":null,"section_label":null}],"concept_label":"Entity Central Index Key","current_period_value":201533,"prior_period_value":201533.0,"visual_current_value":201533,"visual_prior_value":201533.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-63","text_snippet":"0000201533","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-2","char_anchor":"f-63","text_snippet":"0000201533","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":null,"current_value":201533,"prior_value":201533.0},{"tag":"us-gaap:IncomeLossFromContinuingOperations","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent","current_period_value":275,"prior_period_value":251.0,"visual_current_value":275,"visual_prior_value":251.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1308","text_snippet":"275","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1309","text_snippet":"251","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":275,"prior_value":251.0},{"tag":"us-gaap:IncomeLossFromContinuingOperations","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,4.0,3],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent","current_period_value":775,"prior_period_value":731.0,"visual_current_value":775,"visual_prior_value":731.0,"end_current":"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-1310","text_snippet":"775","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1311","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":775,"prior_value":731.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsPerBasicShare","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"cms:EarningsPerShareBasicAndDilutedEPSAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Per Basic Share","current_period_value":0.92,"prior_period_value":0.84,"visual_current_value":0.92,"visual_prior_value":0.84,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1328","text_snippet":"0.92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1329","text_snippet":"0.84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.92,"prior_value":0.84},{"tag":"us-gaap:IncomeLossFromContinuingOperationsPerBasicShare","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"cms:EarningsPerShareBasicAndDilutedEPSAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Per Basic Share","current_period_value":2.59,"prior_period_value":2.45,"visual_current_value":2.59,"visual_prior_value":2.45,"end_current":"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-1330","text_snippet":"2.59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1331","text_snippet":"2.45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":2.59,"prior_value":2.45},{"tag":"us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"cms:EarningsPerShareBasicAndDilutedEPSAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Per Diluted Share","current_period_value":0.92,"prior_period_value":0.84,"visual_current_value":0.92,"visual_prior_value":0.84,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1332","text_snippet":"0.92","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1333","text_snippet":"0.84","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":0.92,"prior_value":0.84},{"tag":"us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"cms:EarningsPerShareBasicAndDilutedEPSAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,3.0,2,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Per Diluted Share","current_period_value":2.59,"prior_period_value":2.45,"visual_current_value":2.59,"visual_prior_value":2.45,"end_current":"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-1334","text_snippet":"2.59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1335","text_snippet":"2.45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":2.59,"prior_value":2.45},{"tag":"us-gaap:IncrementalCommonSharesAttributableToEquityForwardAgreements","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,3.0,2],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":3.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":3.0,"section_label":"Earnings Per Share"}],"concept_label":"Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements","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":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1320","text_snippet":"0.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":0.1,"prior_value":null},{"tag":"us-gaap:IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":2.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends","current_period_value":0.6,"prior_period_value":0.8,"visual_current_value":0.6,"visual_prior_value":0.8,"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-11","char_anchor":"f-1316","text_snippet":"0.6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1317","text_snippet":"0.8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":0.6,"prior_value":0.8},{"tag":"us-gaap:IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,2.0,1],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":2.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","calculation_weight":1.0,"calculation_order":2.0,"section_label":"Earnings Per Share"}],"concept_label":"Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends","current_period_value":0.6,"prior_period_value":0.7,"visual_current_value":0.6,"visual_prior_value":0.7,"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-1318","text_snippet":"0.6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1319","text_snippet":"0.7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":0.6,"prior_value":0.7},{"tag":"us-gaap:PreferredStockDividendsAndOtherAdjustments","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":-1.0,"order":3.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Earnings Per Share"}],"concept_label":"Preferred Stock Dividends and Other Adjustments","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-11","char_anchor":"f-1304","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1305","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":2.0},{"tag":"us-gaap:PreferredStockDividendsAndOtherAdjustments","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":-1.0,"order":3.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":-1.0,"calculation_order":3.0,"section_label":"Earnings Per Share"}],"concept_label":"Preferred Stock Dividends and Other Adjustments","current_period_value":7,"prior_period_value":7.0,"visual_current_value":7,"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-1","char_anchor":"f-1306","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1307","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":7.0},{"tag":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Diluted","current_period_value":300.4,"prior_period_value":298.8,"visual_current_value":300.4,"visual_prior_value":298.8,"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-11","char_anchor":"f-1324","text_snippet":"300.4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1325","text_snippet":"298.8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":300.4,"prior_value":298.8},{"tag":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":4.0,"preferred_label_role":"totalLabel","global_sort_position":[0,2.0,1,4.0,3],"section_concept":"us-gaap:EarningsPerShareAbstract","section_label":"Earnings Per Share"}],"concept_label":"Weighted Average Number of Shares Outstanding, Diluted","current_period_value":299.4,"prior_period_value":298.2,"visual_current_value":299.4,"visual_prior_value":298.2,"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-1326","text_snippet":"299.4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1327","text_snippet":"298.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":299.4,"prior_value":298.2},{"tag":"us-gaap:WeightedAverageNumberOfSharesOutstandingBasic","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","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":299.7,"prior_period_value":298.0,"visual_current_value":299.7,"visual_prior_value":298.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1312","text_snippet":"299.7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1313","text_snippet":"298.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":299.7,"prior_value":298.0},{"tag":"us-gaap:WeightedAverageNumberOfSharesOutstandingBasic","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","presentation_hierarchy":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,2.0,1,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","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":298.8,"prior_period_value":297.5,"visual_current_value":298.8,"visual_prior_value":297.5,"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-1314","text_snippet":"298.8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1315","text_snippet":"297.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":298.8,"prior_value":297.5},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":272,"prior_period_value":247.0,"visual_current_value":272,"visual_prior_value":247.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1296","text_snippet":"272","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1297","text_snippet":"247","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":272,"prior_value":247.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":-60,"prior_period_value":-37.0,"visual_current_value":-60,"visual_prior_value":-37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1620","text_snippet":"60","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1797","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-60,"prior_value":-37.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":332,"prior_period_value":284.0,"visual_current_value":332,"visual_prior_value":284.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1619","text_snippet":"332","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1796","text_snippet":"284","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":332,"prior_value":284.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":326,"prior_period_value":273.0,"visual_current_value":326,"visual_prior_value":273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1616","text_snippet":"326","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1793","text_snippet":"273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":326,"prior_value":273.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":760,"prior_period_value":692.0,"visual_current_value":760,"visual_prior_value":692.0,"end_current":"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-1298","text_snippet":"760","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1299","text_snippet":"692","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":760,"prior_value":692.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":-88,"prior_period_value":-50.0,"visual_current_value":-88,"visual_prior_value":-50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1974","text_snippet":"88","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2139","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-88,"prior_value":-50.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":848,"prior_period_value":742.0,"visual_current_value":848,"visual_prior_value":742.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1973","text_snippet":"848","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2138","text_snippet":"742","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":848,"prior_value":742.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":618,"prior_period_value":541.0,"visual_current_value":618,"visual_prior_value":541.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1970","text_snippet":"618","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2135","text_snippet":"541","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":618,"prior_value":541.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":238,"prior_period_value":195.0,"visual_current_value":238,"visual_prior_value":195.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1971","text_snippet":"238","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-2136","text_snippet":"195","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":238,"prior_value":195.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"YTD","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":-8,"prior_period_value":6.0,"visual_current_value":-8,"visual_prior_value":6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1972","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2137","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":6.0},{"tag":"us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest","date_type":"Q","period_type":"duration","presentation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":13.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,13.0,12],"section_concept":null,"section_label":null},{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,1.0,0],"section_concept":"us-gaap:EarningsPerShareAbstract","calculation_relationships":[{"role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","parent":"us-gaap:IncomeLossFromContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"earningspersharecmsenergybasicanddilutedepscomputationsdetails","calculation_parent":"us-gaap:IncomeLossFromContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":"Earnings Per Share"}],"concept_label":"Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest","current_period_value":6,"prior_period_value":null,"visual_current_value":6,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1618","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":null},{"tag":"cms:RestructuringAndRelatedCostCumulativeDeferredCost","date_type":"Q","period_type":"instant","presentation_role":"exitactivitiesandassetsalesnarrativedetails","presentation_hierarchy":[{"role":"exitactivitiesandassetsalesnarrativedetails","parent":"us-gaap:RestructuringCostAndReserveLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Cumulative deferred costs","current_period_value":47,"prior_period_value":null,"visual_current_value":47,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:RegulatoryAssetAxis=cms:RetentionIncentiveProgramMember|us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember|us-gaap:RestructuringPlanAxis=cms:JHCampbellGeneratingUnitsMember","dimensions":[{"axis":"us-gaap:RegulatoryAssetAxis","axis_label":"Regulatory Asset","member":"cms:RetentionIncentiveProgramMember","member_label":"Retention Incentive Program [Member]"},{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"},{"axis":"us-gaap:RestructuringPlanAxis","axis_label":"Restructuring Plan","member":"cms:JHCampbellGeneratingUnitsMember","member_label":"J.H. Campbell Generating Units"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-456","char_anchor":"f-2284","text_snippet":"47","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":47,"prior_value":null},{"tag":"us-gaap:RestructuringAndRelatedCostExpectedCost1","date_type":"Q","period_type":"instant","presentation_role":"exitactivitiesandassetsalesnarrativedetails","presentation_hierarchy":[{"role":"exitactivitiesandassetsalesnarrativedetails","parent":"us-gaap:RestructuringCostAndReserveLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Restructuring and Related Cost, Expected Cost","current_period_value":48,"prior_period_value":null,"visual_current_value":48,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember|us-gaap:RestructuringPlanAxis=cms:JHCampbellGeneratingUnitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"},{"axis":"us-gaap:RestructuringPlanAxis","axis_label":"Restructuring Plan","member":"cms:JHCampbellGeneratingUnitsMember","member_label":"J.H. Campbell Generating Units"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-455","char_anchor":"f-2283","text_snippet":"48","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":48,"prior_value":null},{"tag":"cms:RestructuringAndRelatedCostDeferredCost","date_type":"Q","period_type":"duration","presentation_role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringReserveRollForward","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Restructuring and Related Cost, Deferred Cost","current_period_value":1,"prior_period_value":3.0,"visual_current_value":1,"visual_prior_value":3.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-464","char_anchor":"f-2294","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-465","char_anchor":"f-2295","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":3.0},{"tag":"cms:RestructuringAndRelatedCostDeferredCost","date_type":"YTD","period_type":"duration","presentation_role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringReserveRollForward","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,2.0,1,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Restructuring and Related Cost, Deferred Cost","current_period_value":4,"prior_period_value":6.0,"visual_current_value":4,"visual_prior_value":6.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-460","char_anchor":"f-2290","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-461","char_anchor":"f-2291","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":6.0},{"tag":"us-gaap:OtherLiabilities","date_type":"Q","period_type":"instant","presentation_role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringReserveRollForward","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":"Other Liabilities","current_period_value":18,"prior_period_value":22.0,"visual_current_value":18,"visual_prior_value":22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-462","char_anchor":"f-2292","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-463","char_anchor":"f-2293","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":18,"prior_value":22.0},{"tag":"us-gaap:OtherLiabilities","date_type":"Q","period_type":"instant","presentation_role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","presentation_hierarchy":[{"role":"exitactivitiesandassetsalesscheduleofretentionbenefitliabilityrollforwarddetails","parent":"us-gaap:RestructuringReserveRollForward","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":"Other Liabilities","current_period_value":18,"prior_period_value":null,"visual_current_value":18,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:RestructuringCostAndReserveAxis=cms:RetentionBenefitsMember","dimensions":[{"axis":"us-gaap:RestructuringCostAndReserveAxis","axis_label":"Restructuring Cost And Reserve","member":"cms:RetentionBenefitsMember","member_label":"Retention Benefits"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-462","char_anchor":"f-2292","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":18,"prior_value":null},{"tag":"us-gaap:DerivativeNotionalAmount","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementsnarrativedetails","presentation_hierarchy":[{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Derivative, Notional Amount","current_period_value":109,"prior_period_value":null,"visual_current_value":109,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:DerivativeInstrumentRiskAxis=us-gaap:InterestRateSwapMember|us-gaap:HedgingDesignationAxis=us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","dimensions":[{"axis":"us-gaap:DerivativeInstrumentRiskAxis","axis_label":"Derivative Risk","member":"us-gaap:InterestRateSwapMember","member_label":"Interest Rate Swap"},{"axis":"us-gaap:HedgingDesignationAxis","axis_label":"Hedging Designation","member":"us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","member_label":"Not Designated As Hedging Instrument Economic Hedge"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-238","char_anchor":"f-1037","text_snippet":"109","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":109,"prior_value":null},{"tag":"us-gaap:DerivativeFairValueOfDerivativeLiability","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementsnarrativedetails|fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","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":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosure","weight":1.0,"order":1.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:LiabilitiesFairValueDisclosure","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Derivative Liability, Subject to Master Netting Arrangement, before Offset","current_period_value":4,"prior_period_value":null,"visual_current_value":4,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=cms:FairValueInputsLevel2AndLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"cms:FairValueInputsLevel2AndLevel3Member","member_label":"Fair Value, Inputs, Level 2 And Level 3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-230","char_anchor":"f-1029","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":null},{"tag":"us-gaap:DerivativeFairValueOfDerivativeLiability","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementsnarrativedetails|fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","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":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosure","weight":1.0,"order":1.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:LiabilitiesFairValueDisclosure","calculation_weight":1.0,"calculation_order":1.0,"section_label":null},{"role":"fairvaluemeasurementsnarrativedetails","parent":"us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems","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":"Derivative Liability, Subject to Master Netting Arrangement, before Offset","current_period_value":4,"prior_period_value":null,"visual_current_value":4,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:HedgingDesignationAxis=us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","dimensions":[{"axis":"us-gaap:HedgingDesignationAxis","axis_label":"Hedging Designation","member":"us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember","member_label":"Not Designated As Hedging Instrument Economic Hedge"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-241","char_anchor":"f-1040","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":4,"prior_value":null},{"tag":"cms:NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","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,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":2.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Nonqualified deferred compensation plan assets","current_period_value":27,"prior_period_value":25.0,"visual_current_value":27,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-228","char_anchor":"f-1015","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-223","char_anchor":"f-1007","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":27,"prior_value":25.0},{"tag":"cms:NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","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,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":2.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Nonqualified deferred compensation plan assets","current_period_value":35,"prior_period_value":34.0,"visual_current_value":35,"visual_prior_value":34.0,"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-226","char_anchor":"f-1013","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-221","char_anchor":"f-1005","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":34.0},{"tag":"cms:NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosure","weight":1.0,"order":2.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:LiabilitiesFairValueDisclosure","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Nonqualified deferred compensation plan liabilities","current_period_value":27,"prior_period_value":25.0,"visual_current_value":27,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-228","char_anchor":"f-1027","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-223","char_anchor":"f-1019","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":27,"prior_value":25.0},{"tag":"cms:NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosure","weight":1.0,"order":2.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:LiabilitiesFairValueDisclosure","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Nonqualified deferred compensation plan liabilities","current_period_value":35,"prior_period_value":34.0,"visual_current_value":35,"visual_prior_value":34.0,"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-226","char_anchor":"f-1025","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-221","char_anchor":"f-1017","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":34.0},{"tag":"us-gaap:AssetsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Assets, Fair Value Disclosure","current_period_value":99,"prior_period_value":292.0,"visual_current_value":99,"visual_prior_value":292.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel12And3Member","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel12And3Member","member_label":"Fair Value Inputs Level12 And3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-236","char_anchor":"f-1023","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-231","char_anchor":"f-1015","text_snippet":"292","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":99,"prior_value":292.0},{"tag":"us-gaap:AssetsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Assets, Fair Value Disclosure","current_period_value":183,"prior_period_value":321.0,"visual_current_value":183,"visual_prior_value":321.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel12And3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel12And3Member","member_label":"Fair Value Inputs Level12 And3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-234","char_anchor":"f-1021","text_snippet":"183","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-229","char_anchor":"f-1013","text_snippet":"321","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":183,"prior_value":321.0},{"tag":"us-gaap:CashAndCashEquivalentsFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":3.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Cash and Cash Equivalents, Fair Value Disclosure","current_period_value":75,"prior_period_value":228.0,"visual_current_value":75,"visual_prior_value":228.0,"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-226","char_anchor":"f-1005","text_snippet":"75","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-221","char_anchor":"f-997","text_snippet":"228","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":75,"prior_value":228.0},{"tag":"us-gaap:DerivativeFairValueOfDerivativeAsset","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":1.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Derivative Asset, Subject to Master Netting Arrangement, before Offset","current_period_value":3,"prior_period_value":null,"visual_current_value":3,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=cms:FairValueInputsLevel2AndLevel3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"cms:FairValueInputsLevel2AndLevel3Member","member_label":"Fair Value, Inputs, Level 2 And Level 3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-230","char_anchor":"f-1017","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":null},{"tag":"us-gaap:DerivativeFairValueOfDerivativeAsset","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:AssetsFairValueDisclosure","weight":1.0,"order":1.0}],"calculation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","calculation_parent":"us-gaap:AssetsFairValueDisclosure","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Derivative Asset, Subject to Master Netting Arrangement, before Offset","current_period_value":3,"prior_period_value":null,"visual_current_value":3,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=cms:FairValueInputsLevel2AndLevel3Member","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"cms:FairValueInputsLevel2AndLevel3Member","member_label":"Fair Value, Inputs, Level 2 And Level 3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-232","char_anchor":"f-1019","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":null},{"tag":"us-gaap:LiabilitiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liabilities, Fair Value Disclosure","current_period_value":27,"prior_period_value":25.0,"visual_current_value":27,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel12And3Member","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel12And3Member","member_label":"Fair Value Inputs Level12 And3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-236","char_anchor":"f-1035","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-231","char_anchor":"f-1023","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":27,"prior_value":25.0},{"tag":"us-gaap:LiabilitiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","presentation_hierarchy":[{"role":"fairvaluemeasurementssummaryofassetsandliabilitiesmeasuredatfairvalueonarecurringbasisdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Liabilities, Fair Value Disclosure","current_period_value":39,"prior_period_value":34.0,"visual_current_value":39,"visual_prior_value":34.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel12And3Member","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel12And3Member","member_label":"Fair Value Inputs Level12 And3"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-234","char_anchor":"f-1033","text_snippet":"39","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-229","char_anchor":"f-1021","text_snippet":"34","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":39,"prior_value":34.0},{"tag":"us-gaap:DebtInstrumentInterestRateStatedPercentage","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsnarrativedetails|financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"section_label":null},{"role":"financialinstrumentsnarrativedetails","parent":"cms:FinancialInstrumentsLineItems","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":"Debt Instrument, Interest Rate, Stated Percentage","current_period_value":6.5,"prior_period_value":null,"visual_current_value":6.5,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:DebtInstrumentAxis=cms:A6.500JuniorSubordinatedNotesDueJune2055Member|us-gaap:LongtermDebtTypeAxis=us-gaap:JuniorSubordinatedDebtMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:A6.500JuniorSubordinatedNotesDueJune2055Member","member_label":"6.500% Junior Subordinated Notes Due June 2055"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"us-gaap:JuniorSubordinatedDebtMember","member_label":"Junior Subordinated Debt"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-181","char_anchor":"f-909","text_snippet":"6.500","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"hundredths","current_value":6.5,"prior_value":null},{"tag":"us-gaap:DebtInstrumentInterestRateStatedPercentage","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsnarrativedetails|financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"section_label":null},{"role":"financialinstrumentsnarrativedetails","parent":"cms:FinancialInstrumentsLineItems","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":"Debt Instrument, Interest Rate, Stated Percentage","current_period_value":4.5,"prior_period_value":null,"visual_current_value":4.5,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:A4.500FirstMortgageBondsDueJune2031Member|us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:A4.500FirstMortgageBondsDueJune2031Member","member_label":"4.500% First Mortgage Bonds Due January 2031"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-186","char_anchor":"f-915","text_snippet":"4.500","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"hundredths","current_value":4.5,"prior_value":null},{"tag":"us-gaap:DebtInstrumentInterestRateStatedPercentage","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsnarrativedetails|financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"section_label":null},{"role":"financialinstrumentsnarrativedetails","parent":"cms:FinancialInstrumentsLineItems","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":"Debt Instrument, Interest Rate, Stated Percentage","current_period_value":5.05,"prior_period_value":null,"visual_current_value":5.05,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:A5.050FirstMortgageBondsDueMay2035Member|us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:A5.050FirstMortgageBondsDueMay2035Member","member_label":"5.050% First Mortgage Bonds Due May 2035"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-187","char_anchor":"f-917","text_snippet":"5.050","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"hundredths","current_value":5.05,"prior_value":null},{"tag":"us-gaap:DebtInstrumentInterestRateStatedPercentage","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsnarrativedetails|financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"section_label":null},{"role":"financialinstrumentsnarrativedetails","parent":"cms:FinancialInstrumentsLineItems","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":"Debt Instrument, Interest Rate, Stated Percentage","current_period_value":4.1,"prior_period_value":null,"visual_current_value":4.1,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:CMSEnergyNotePayableMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:CMSEnergyNotePayableMember","member_label":"CMS Energy Note Payable"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-282","char_anchor":"f-1137","text_snippet":"4.10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"hundredths","current_value":4.1,"prior_value":null},{"tag":"cms:AccountsReceivableBeforeAllowanceForCreditLossAndNotesReceivableCurrent","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Current accounts receivable and notes receivable","current_period_value":3,"prior_period_value":4.0,"visual_current_value":3,"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-32","char_anchor":"f-1126","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-1109","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":4.0},{"tag":"cms:AccountsReceivableBeforeAllowanceForCreditLossAndNotesReceivableCurrent","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Current accounts receivable and notes receivable","current_period_value":3,"prior_period_value":4.0,"visual_current_value":3,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-1125","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-1110","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":4.0},{"tag":"cms:NotesReceivableRelatedPartiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes receivable related party","current_period_value":91,"prior_period_value":95.0,"visual_current_value":91,"visual_prior_value":95.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-256","char_anchor":"f-1089","text_snippet":"91","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-247","char_anchor":"f-1073","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":91,"prior_value":95.0},{"tag":"cms:NotesReceivableRelatedPartiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes receivable related party","current_period_value":91,"prior_period_value":95.0,"visual_current_value":91,"visual_prior_value":95.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-252","char_anchor":"f-1085","text_snippet":"91","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-243","char_anchor":"f-1069","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":91,"prior_value":95.0},{"tag":"cms:NotesReceivableRelatedPartiesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes receivable related party","current_period_value":91,"prior_period_value":95.0,"visual_current_value":91,"visual_prior_value":95.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-253","char_anchor":"f-1086","text_snippet":"91","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-244","char_anchor":"f-1070","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":91,"prior_value":95.0},{"tag":"us-gaap:LongTermDebtCurrent","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Current Maturities","current_period_value":1.2,"prior_period_value":503.0,"visual_current_value":1.2,"visual_prior_value":503.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-1129","text_snippet":"1.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-1113","text_snippet":"503","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"billions","current_value":1.2,"prior_value":503.0},{"tag":"us-gaap:LongTermDebtCurrent","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Current Maturities","current_period_value":572,"prior_period_value":503.0,"visual_current_value":572,"visual_prior_value":503.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-1135","text_snippet":"572","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-1118","text_snippet":"503","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":572,"prior_value":503.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":9182,"prior_period_value":8587.0,"visual_current_value":9182,"visual_prior_value":8587.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-265","char_anchor":"f-1098","text_snippet":"9,182","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-256","char_anchor":"f-1082","text_snippet":"8,587","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":9182,"prior_value":8587.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":674,"prior_period_value":531.0,"visual_current_value":674,"visual_prior_value":531.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-275","char_anchor":"f-1108","text_snippet":"674","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-266","char_anchor":"f-1092","text_snippet":"531","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":674,"prior_value":531.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":1950,"prior_period_value":2032.0,"visual_current_value":1950,"visual_prior_value":2032.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-266","char_anchor":"f-1099","text_snippet":"1,950","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-257","char_anchor":"f-1083","text_snippet":"2,032","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1950,"prior_value":2032.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":12109,"prior_period_value":11427.0,"visual_current_value":12109,"visual_prior_value":11427.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-262","char_anchor":"f-1095","text_snippet":"12,109","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-253","char_anchor":"f-1079","text_snippet":"11,427","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":12109,"prior_value":11427.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":1005,"prior_period_value":731.0,"visual_current_value":1005,"visual_prior_value":731.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-272","char_anchor":"f-1105","text_snippet":"1,005","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-263","char_anchor":"f-1089","text_snippet":"731","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1005,"prior_value":731.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":11132,"prior_period_value":10619.0,"visual_current_value":11132,"visual_prior_value":10619.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:NonrelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:NonrelatedPartyMember","member_label":"Nonrelated Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-263","char_anchor":"f-1096","text_snippet":"11,132","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-254","char_anchor":"f-1080","text_snippet":"10,619","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":11132,"prior_value":10619.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":674,"prior_period_value":531.0,"visual_current_value":674,"visual_prior_value":531.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-273","char_anchor":"f-1106","text_snippet":"674","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-264","char_anchor":"f-1090","text_snippet":"531","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":674,"prior_value":531.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":2111,"prior_period_value":1101.0,"visual_current_value":2111,"visual_prior_value":1101.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel1Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel1Member","member_label":"Fair Value Inputs Level1"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-244","char_anchor":"f-1057","text_snippet":"2,111","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-235","char_anchor":"f-1041","text_snippet":"1,101","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2111,"prior_value":1101.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":12932,"prior_period_value":12096.0,"visual_current_value":12932,"visual_prior_value":12096.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel2Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel2Member","member_label":"Fair Value Inputs Level2"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-245","char_anchor":"f-1058","text_snippet":"12,932","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-236","char_anchor":"f-1042","text_snippet":"12,096","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":12932,"prior_value":12096.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":1950,"prior_period_value":2032.0,"visual_current_value":1950,"visual_prior_value":2032.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-246","char_anchor":"f-1059","text_snippet":"1,950","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-237","char_anchor":"f-1043","text_snippet":"2,032","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1950,"prior_value":2032.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":17930,"prior_period_value":16051.0,"visual_current_value":17930,"visual_prior_value":16051.0,"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-242","char_anchor":"f-1055","text_snippet":"17,930","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-233","char_anchor":"f-1039","text_snippet":"16,051","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":17930,"prior_value":16051.0},{"tag":"us-gaap:LongTermDebtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Fair Value","current_period_value":16993,"prior_period_value":15229.0,"visual_current_value":16993,"visual_prior_value":15229.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-243","char_anchor":"f-1056","text_snippet":"16,993","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-234","char_anchor":"f-1040","text_snippet":"15,229","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":16993,"prior_value":15229.0},{"tag":"us-gaap:NotesAndLoansReceivableNetCurrent","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems","order":6.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Financing Receivable, after Allowance for Credit Loss, Current","current_period_value":7,"prior_period_value":7.0,"visual_current_value":7,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-109","char_anchor":"f-1134","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-121","char_anchor":"f-1117","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":7.0},{"tag":"us-gaap:NotesPayableFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes Payable, Fair Value Disclosure","current_period_value":2,"prior_period_value":4.0,"visual_current_value":2,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-256","char_anchor":"f-1119","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-247","char_anchor":"f-1103","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":4.0},{"tag":"us-gaap:NotesPayableFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes Payable, Fair Value Disclosure","current_period_value":2,"prior_period_value":4.0,"visual_current_value":2,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-252","char_anchor":"f-1115","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-243","char_anchor":"f-1099","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":4.0},{"tag":"us-gaap:NotesPayableFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes Payable, Fair Value Disclosure","current_period_value":2,"prior_period_value":4.0,"visual_current_value":2,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-253","char_anchor":"f-1116","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-244","char_anchor":"f-1100","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":4.0},{"tag":"us-gaap:NotesPayableFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes Payable, Fair Value Disclosure","current_period_value":8,"prior_period_value":11.0,"visual_current_value":8,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-246","char_anchor":"f-1069","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-237","char_anchor":"f-1053","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":11.0},{"tag":"us-gaap:NotesPayableFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes Payable, Fair Value Disclosure","current_period_value":8,"prior_period_value":11.0,"visual_current_value":8,"visual_prior_value":11.0,"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-242","char_anchor":"f-1065","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-233","char_anchor":"f-1049","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":11.0},{"tag":"us-gaap:NotesPayableFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:LiabilitiesFairValueDisclosureAbstract","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Notes Payable, Fair Value Disclosure","current_period_value":8,"prior_period_value":11.0,"visual_current_value":8,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-243","char_anchor":"f-1066","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-234","char_anchor":"f-1050","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":11.0},{"tag":"us-gaap:OtherShortTermBorrowings","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Other Short-Term Borrowings","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-32","char_anchor":"f-1131","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-1115","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:ReceivablesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Receivables, Fair Value Disclosure","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-256","char_anchor":"f-1079","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-247","char_anchor":"f-1063","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":9.0},{"tag":"us-gaap:ReceivablesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Receivables, Fair Value Disclosure","current_period_value":7,"prior_period_value":9.0,"visual_current_value":7,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:CarryingReportedAmountFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"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-252","char_anchor":"f-1075","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-243","char_anchor":"f-1059","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":9.0},{"tag":"us-gaap:ReceivablesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Receivables, Fair Value Disclosure","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-253","char_anchor":"f-1076","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-244","char_anchor":"f-1060","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":9.0},{"tag":"us-gaap:ReceivablesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Receivables, Fair Value Disclosure","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:FairValueByFairValueHierarchyLevelAxis=us-gaap:FairValueInputsLevel3Member|us-gaap:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByFairValueHierarchyLevelAxis","axis_label":"Fair Value Hierarchy","member":"us-gaap:FairValueInputsLevel3Member","member_label":"Fair Value Inputs Level3"},{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-246","char_anchor":"f-1049","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-237","char_anchor":"f-1033","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":9.0},{"tag":"us-gaap:ReceivablesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Receivables, Fair Value Disclosure","current_period_value":7,"prior_period_value":9.0,"visual_current_value":7,"visual_prior_value":9.0,"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-242","char_anchor":"f-1045","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-233","char_anchor":"f-1029","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":9.0},{"tag":"us-gaap:ReceivablesFairValueDisclosure","date_type":"Q","period_type":"instant","presentation_role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","presentation_hierarchy":[{"role":"financialinstrumentsscheduleofcarryingamountsandfairvaluesoffinancialinstrumentsdetails","parent":"us-gaap:AssetsFairValueDisclosureAbstract","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Receivables, Fair Value Disclosure","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:FairValueByMeasurementBasisAxis=us-gaap:EstimateOfFairValueFairValueDisclosureMember","dimensions":[{"axis":"us-gaap:FairValueByMeasurementBasisAxis","axis_label":"Fair Value By Measurement Basis","member":"us-gaap:EstimateOfFairValueFairValueDisclosureMember","member_label":"Estimate Of Fair Value Fair Value Disclosure"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-243","char_anchor":"f-1046","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-234","char_anchor":"f-1030","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":9.0},{"tag":"us-gaap:ExtinguishmentOfDebtAmount","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Extinguishment of Debt, Amount","current_period_value":184,"prior_period_value":311.0,"visual_current_value":184,"visual_prior_value":311.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember|us-gaap:RelatedPartyTransactionsByRelatedPartyAxis=us-gaap:RelatedPartyMember","dimensions":[{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"},{"axis":"us-gaap:RelatedPartyTransactionsByRelatedPartyAxis","axis_label":"Related Party Transactions By Related Party","member":"us-gaap:RelatedPartyMember","member_label":"Related Party"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-193","char_anchor":"f-926","text_snippet":"184","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-198","char_anchor":"f-932","text_snippet":"311","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":184,"prior_value":311.0},{"tag":"us-gaap:GainsLossesOnExtinguishmentOfDebt","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationfirstmortgagebondpurchasedetails","parent":"us-gaap:DebtInstrumentLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Gain (Loss) on Extinguishment of Debt","current_period_value":72,"prior_period_value":90.0,"visual_current_value":72,"visual_prior_value":90.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-194","char_anchor":"f-928","text_snippet":"72","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-200","char_anchor":"f-936","text_snippet":"90","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":72,"prior_value":90.0},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":1000,"prior_period_value":null,"visual_current_value":1000,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:DebtInstrumentAxis=cms:A6.500JuniorSubordinatedNotesDueJune2055Member|us-gaap:LongtermDebtTypeAxis=us-gaap:JuniorSubordinatedDebtMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:A6.500JuniorSubordinatedNotesDueJune2055Member","member_label":"6.500% Junior Subordinated Notes Due June 2055"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"us-gaap:JuniorSubordinatedDebtMember","member_label":"Junior Subordinated Debt"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-181","char_anchor":"f-908","text_snippet":"1,000","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":1000,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":110,"prior_period_value":null,"visual_current_value":110,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:DebtInstrumentAxis=cms:TermLoanFacilityDueDecember2025Member|us-gaap:LongtermDebtTypeAxis=cms:TermLoanFacilityMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:TermLoanFacilityDueDecember2025Member","member_label":"Term Loan Facility Due December 2025"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:TermLoanFacilityMember","member_label":"Term loan facility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-182","char_anchor":"f-910","text_snippet":"110","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":110,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":1110,"prior_period_value":null,"visual_current_value":1110,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-183","char_anchor":"f-911","text_snippet":"1,110","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":1110,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":179,"prior_period_value":null,"visual_current_value":179,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:DebtInstrumentAxis=cms:ConstructionFinancingAgreementMember|us-gaap:LongtermDebtTypeAxis=us-gaap:ConstructionLoansMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:ConstructionFinancingAgreementMember","member_label":"Construction Financing Agreement"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"us-gaap:ConstructionLoansMember","member_label":"Construction Loans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-184","char_anchor":"f-912","text_snippet":"179","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":179,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":179,"prior_period_value":null,"visual_current_value":179,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-185","char_anchor":"f-913","text_snippet":"179","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":179,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":500,"prior_period_value":null,"visual_current_value":500,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:A4.500FirstMortgageBondsDueJune2031Member|us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:A4.500FirstMortgageBondsDueJune2031Member","member_label":"4.500% First Mortgage Bonds Due January 2031"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-186","char_anchor":"f-914","text_snippet":"500","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":500,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":625,"prior_period_value":null,"visual_current_value":625,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:DebtInstrumentAxis=cms:A5.050FirstMortgageBondsDueMay2035Member|us-gaap:LongtermDebtTypeAxis=cms:FirstMortgageBondsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:A5.050FirstMortgageBondsDueMay2035Member","member_label":"5.050% First Mortgage Bonds Due May 2035"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:FirstMortgageBondsMember","member_label":"First mortgage bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-187","char_anchor":"f-916","text_snippet":"625","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":625,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":1125,"prior_period_value":null,"visual_current_value":1125,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-918","text_snippet":"1,125","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":1125,"prior_value":null},{"tag":"us-gaap:DebtInstrumentFaceAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Face Amount","current_period_value":2414,"prior_period_value":null,"visual_current_value":2414,"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-32","char_anchor":"f-919","text_snippet":"2,414","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":2414,"prior_value":null},{"tag":"us-gaap:RepaymentsOfDebt","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Repayments of Debt","current_period_value":600,"prior_period_value":500.0,"visual_current_value":600,"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-925","text_snippet":"600","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-1","char_anchor":"f-945","text_snippet":"500","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":600,"prior_value":500.0},{"tag":"us-gaap:RepaymentsOfDebt","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Repayments of Debt","current_period_value":600,"prior_period_value":250.0,"visual_current_value":600,"visual_prior_value":250.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-192","char_anchor":"f-924","text_snippet":"600","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-198","char_anchor":"f-941","text_snippet":"250","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":600,"prior_value":250.0},{"tag":"us-gaap:RepaymentsOfDebt","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Repayments of Debt","current_period_value":400,"prior_period_value":null,"visual_current_value":400,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:DebtInstrumentAxis=cms:TermLoanFacilityDueSeptember2025Member|us-gaap:LongtermDebtTypeAxis=cms:TermLoanFacilityMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:TermLoanFacilityDueSeptember2025Member","member_label":"Term Loan Facility Due September 2025 [Member]"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:TermLoanFacilityMember","member_label":"Term loan facility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-190","char_anchor":"f-922","text_snippet":"400","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":400,"prior_value":null},{"tag":"us-gaap:RepaymentsOfDebt","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationmajorlongtermdebtissuancesandretirementsdetails","parent":"us-gaap:DebtInstrumentLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Repayments of Debt","current_period_value":200,"prior_period_value":null,"visual_current_value":200,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:DebtInstrumentAxis=cms:TermLoanFacilityDueDecember2025Member|us-gaap:LongtermDebtTypeAxis=cms:TermLoanFacilityMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:DebtInstrumentAxis","axis_label":"Debt Instrument","member":"cms:TermLoanFacilityDueDecember2025Member","member_label":"Term Loan Facility Due December 2025"},{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:TermLoanFacilityMember","member_label":"Term loan facility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-191","char_anchor":"f-923","text_snippet":"200","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":200,"prior_value":null},{"tag":"cms:AmountAvailableForDividendDistribution","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":10.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,10.0,9],"section_concept":null,"section_label":null}],"concept_label":"Limitation on payment of stock dividends","current_period_value":8.6,"prior_period_value":7.9,"visual_current_value":8.6,"visual_prior_value":7.9,"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-32","char_anchor":"f-986","text_snippet":"8.6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-987","text_snippet":"7.9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"billions","current_value":8.6,"prior_value":7.9},{"tag":"cms:ShortTermDebtAuthorizedBorrowings","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,1.0,0],"section_concept":null,"section_label":null}],"concept_label":"Short-term debt authorized borrowings","current_period_value":500,"prior_period_value":500.0,"visual_current_value":500,"visual_prior_value":500.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:ShortTermDebtTypeAxis=us-gaap:CommercialPaperMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:ShortTermDebtTypeAxis","axis_label":"Short Term Debt Type","member":"us-gaap:CommercialPaperMember","member_label":"Commercial Paper"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-213","char_anchor":"f-976","text_snippet":"500","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-214","char_anchor":"f-982","text_snippet":"500","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":500,"prior_value":500.0},{"tag":"cms:SupplierFinanceProgramTerminationPeriod","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":7.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,7.0,6],"section_concept":null,"section_label":null}],"concept_label":"Supplier financing program, termination period","current_period_value":30,"prior_period_value":null,"visual_current_value":30,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-219","char_anchor":"f-983","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":null,"current_value":30,"prior_value":null},{"tag":"us-gaap:CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries","date_type":"YTD","period_type":"duration","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":12.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries","current_period_value":649,"prior_period_value":544.0,"visual_current_value":649,"visual_prior_value":544.0,"end_current":"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-988","text_snippet":"649","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-1","char_anchor":"f-989","text_snippet":"544","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":649,"prior_value":544.0},{"tag":"us-gaap:ForwardContractIndexedToIssuersEquityForwardRate","date_type":"Q","period_type":"duration","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":15.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,15.0,14],"section_concept":null,"section_label":null}],"concept_label":"Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share","current_period_value":72.42,"prior_period_value":null,"visual_current_value":72.42,"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-11","char_anchor":"f-991","text_snippet":"72.42","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"units","current_value":72.42,"prior_value":null},{"tag":"us-gaap:ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":21.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,21.0,20],"section_concept":null,"section_label":null}],"concept_label":"Forward Contract Indexed to Equity, Settlement, Cash, Amount","current_period_value":2,"prior_period_value":null,"visual_current_value":2,"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-32","char_anchor":"f-1000","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":null},{"tag":"us-gaap:ForwardContractIndexedToIssuersEquitySettlementAlternativesSharesAtFairValue","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":20.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,20.0,19],"section_concept":null,"section_label":null}],"concept_label":"Forward Contract Indexed to Equity, Settlement, Number of Shares","current_period_value":21313,"prior_period_value":null,"visual_current_value":21313,"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-32","char_anchor":"f-999","text_snippet":"21,313","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"units","current_value":21313,"prior_value":null},{"tag":"us-gaap:ForwardContractIndexedToIssuersEquityShares","date_type":"Q","period_type":"duration","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":14.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,8.0,7,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Forward Contract Indexed to Issuer's Equity, Shares","current_period_value":2.1,"prior_period_value":null,"visual_current_value":2.1,"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-11","char_anchor":"f-990","text_snippet":"2.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":2.1,"prior_value":null},{"tag":"us-gaap:SaleOfStockConsiderationReceivedOnTransaction","date_type":"Q","period_type":"duration","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":18.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,18.0,17],"section_concept":null,"section_label":null}],"concept_label":"Sale of Stock, Consideration Received on Transaction","current_period_value":349,"prior_period_value":null,"visual_current_value":349,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:SubsidiarySaleOfStockAxis=cms:SettlementOfForwardContractsMember","dimensions":[{"axis":"us-gaap:SubsidiarySaleOfStockAxis","axis_label":"Subsidiary Sale Of Stock","member":"cms:SettlementOfForwardContractsMember","member_label":"Settlement Of Forward Contracts"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-222","char_anchor":"f-994","text_snippet":"349","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":349,"prior_value":null},{"tag":"us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction","date_type":"Q","period_type":"duration","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":16.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,16.0,15],"section_concept":null,"section_label":null}],"concept_label":"Sale of Stock, Number of Shares Issued in Transaction","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:SubsidiarySaleOfStockAxis=cms:SettlementOfForwardContractsMember","dimensions":[{"axis":"us-gaap:SubsidiarySaleOfStockAxis","axis_label":"Subsidiary Sale Of Stock","member":"cms:SettlementOfForwardContractsMember","member_label":"Settlement Of Forward Contracts"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-222","char_anchor":"f-992","text_snippet":"5.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":null},{"tag":"us-gaap:SaleOfStockPricePerShare","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":17.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,17.0,16],"section_concept":null,"section_label":null}],"concept_label":"Sale of Stock, Price Per Share","current_period_value":70.52,"prior_period_value":null,"visual_current_value":70.52,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"us-gaap:SubsidiarySaleOfStockAxis=cms:SettlementOfForwardContractsMember","dimensions":[{"axis":"us-gaap:SubsidiarySaleOfStockAxis","axis_label":"Subsidiary Sale Of Stock","member":"cms:SettlementOfForwardContractsMember","member_label":"Settlement Of Forward Contracts"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-223","char_anchor":"f-993","text_snippet":"70.52","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"units","current_value":70.52,"prior_value":null},{"tag":"us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":11.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,11.0,10],"section_concept":null,"section_label":null}],"concept_label":"Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval","current_period_value":2.5,"prior_period_value":2.3,"visual_current_value":2.5,"visual_prior_value":2.3,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-987","text_snippet":"2.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-988","text_snippet":"2.3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"billions","current_value":2.5,"prior_value":2.3},{"tag":"us-gaap:SupplierFinanceProgramObligation","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,9.0,8],"section_concept":null,"section_label":null}],"concept_label":"Supplier Finance Program, Obligation","current_period_value":79,"prior_period_value":null,"visual_current_value":79,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:NorthStarCleanEnergyMember|us-gaap:SupplierFinanceProgramAxis=cms:NorthStarCleanEnergysSupplierFinancingProgramMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"},{"axis":"us-gaap:SupplierFinanceProgramAxis","axis_label":"Supplier Finance Program","member":"cms:NorthStarCleanEnergysSupplierFinancingProgramMember","member_label":"NorthStar Clean Energy's Supplier Financing Program"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-220","char_anchor":"f-985","text_snippet":"79","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":79,"prior_value":null},{"tag":"us-gaap:SupplierFinanceProgramPaymentTimingPeriod","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails","presentation_hierarchy":[{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Supplier Finance Program, Payment Timing, Period","current_period_value":135,"prior_period_value":null,"visual_current_value":135,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-219","char_anchor":"f-982","text_snippet":"135","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":null,"current_value":135,"prior_value":null},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":1100,"prior_period_value":1100.0,"visual_current_value":1100,"visual_prior_value":1100.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFiveMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFiveMember","member_label":"Revolving Credit Facilities December 14, 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-208","char_anchor":"f-961","text_snippet":"1,100","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-209","char_anchor":"f-968","text_snippet":"1,100","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1100,"prior_value":1100.0},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":250,"prior_period_value":250.0,"visual_current_value":250,"visual_prior_value":250.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesOneMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesOneMember","member_label":"Revolving Credit Facilities November 18, 2025"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-209","char_anchor":"f-965","text_snippet":"250","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-210","char_anchor":"f-972","text_snippet":"250","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":250,"prior_value":250.0},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":250,"prior_period_value":150.0,"visual_current_value":250,"visual_prior_value":150.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFourMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFourMember","member_label":"Revolving Credit Facilities May 30, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-205","char_anchor":"f-949","text_snippet":"250","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-207","char_anchor":"f-960","text_snippet":"150","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":250,"prior_value":150.0},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":37,"prior_period_value":37.0,"visual_current_value":37,"visual_prior_value":37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesSixMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesSixMember","member_label":"Revolving Credit Facilities December 25, 2025"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-206","char_anchor":"f-953","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-208","char_anchor":"f-964","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":37,"prior_value":37.0},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":50,"prior_period_value":50.0,"visual_current_value":50,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesSevenMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesSevenMember","member_label":"Revolving Credit Facilities September 30, 2026"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-204","char_anchor":"f-945","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-206","char_anchor":"f-956","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":50,"prior_value":50.0},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":550,"prior_period_value":550.0,"visual_current_value":550,"visual_prior_value":550.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesTwoMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesTwoMember","member_label":"Revolving Credit Facilities December 14, 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-203","char_anchor":"f-941","text_snippet":"550","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-205","char_anchor":"f-952","text_snippet":"550","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":550,"prior_value":550.0},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":19,"prior_period_value":null,"visual_current_value":19,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesThreeMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesThreeMember","member_label":"Revolving Credit Facilities Upon Completion of Construction Project"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-207","char_anchor":"f-957","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":null},{"tag":"us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationnarrativedetails|financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":1.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"financingsandcapitalizationnarrativedetails","parent":"cms:FinancingAndCapitalizationLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,8.0,7,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Maximum Borrowing Capacity","current_period_value":50,"prior_period_value":null,"visual_current_value":50,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesEightMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesEightMember","member_label":"Revolving Credit Facilities March 31, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-210","char_anchor":"f-969","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":50,"prior_value":null},{"tag":"us-gaap:DebtInstrumentCollateralAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Debt Instrument, Collateral Amount","current_period_value":515,"prior_period_value":396.0,"visual_current_value":515,"visual_prior_value":396.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFourMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFourMember","member_label":"Revolving Credit Facilities May 30, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-205","char_anchor":"f-974","text_snippet":"515","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-207","char_anchor":"f-977","text_snippet":"396","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":515,"prior_value":396.0},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":10,"prior_period_value":27.0,"visual_current_value":10,"visual_prior_value":27.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFiveMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFiveMember","member_label":"Revolving Credit Facilities December 14, 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-208","char_anchor":"f-963","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-209","char_anchor":"f-970","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":27.0},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":112,"prior_period_value":57.0,"visual_current_value":112,"visual_prior_value":57.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesOneMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesOneMember","member_label":"Revolving Credit Facilities November 18, 2025"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-209","char_anchor":"f-967","text_snippet":"112","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-210","char_anchor":"f-974","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":112,"prior_value":57.0},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":37,"prior_period_value":37.0,"visual_current_value":37,"visual_prior_value":37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesSixMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesSixMember","member_label":"Revolving Credit Facilities December 25, 2025"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-206","char_anchor":"f-955","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-208","char_anchor":"f-966","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":37,"prior_value":37.0},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":50,"prior_period_value":50.0,"visual_current_value":50,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesSevenMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesSevenMember","member_label":"Revolving Credit Facilities September 30, 2026"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-204","char_anchor":"f-947","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-206","char_anchor":"f-958","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":50,"prior_value":50.0},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":35,"prior_period_value":30.0,"visual_current_value":35,"visual_prior_value":30.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesTwoMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesTwoMember","member_label":"Revolving Credit Facilities December 14, 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-203","char_anchor":"f-943","text_snippet":"35","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-205","char_anchor":"f-954","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":35,"prior_value":30.0},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":8,"prior_period_value":null,"visual_current_value":8,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFourMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFourMember","member_label":"Revolving Credit Facilities May 30, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-205","char_anchor":"f-951","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":null},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":12,"prior_period_value":null,"visual_current_value":12,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesThreeMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesThreeMember","member_label":"Revolving Credit Facilities Upon Completion of Construction Project"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-207","char_anchor":"f-959","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":null},{"tag":"us-gaap:LettersOfCreditOutstandingAmount","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Letters of Credit Outstanding, Amount","current_period_value":42,"prior_period_value":null,"visual_current_value":42,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesEightMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesEightMember","member_label":"Revolving Credit Facilities March 31, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-210","char_anchor":"f-971","text_snippet":"42","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":42,"prior_value":null},{"tag":"us-gaap:LineOfCredit","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Line of Credit","current_period_value":180,"prior_period_value":null,"visual_current_value":180,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFourMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFourMember","member_label":"Revolving Credit Facilities May 30, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-205","char_anchor":"f-950","text_snippet":"180","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":180,"prior_value":null},{"tag":"us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Remaining Borrowing Capacity","current_period_value":1090,"prior_period_value":1073.0,"visual_current_value":1090,"visual_prior_value":1073.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFiveMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFiveMember","member_label":"Revolving Credit Facilities December 14, 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-208","char_anchor":"f-964","text_snippet":"1,090","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-209","char_anchor":"f-971","text_snippet":"1,073","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1090,"prior_value":1073.0},{"tag":"us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Remaining Borrowing Capacity","current_period_value":138,"prior_period_value":193.0,"visual_current_value":138,"visual_prior_value":193.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesOneMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesOneMember","member_label":"Revolving Credit Facilities November 18, 2025"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-209","char_anchor":"f-968","text_snippet":"138","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-210","char_anchor":"f-975","text_snippet":"193","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":138,"prior_value":193.0},{"tag":"us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Remaining Borrowing Capacity","current_period_value":515,"prior_period_value":520.0,"visual_current_value":515,"visual_prior_value":520.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=srt:ParentCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesTwoMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"srt:ParentCompanyMember","member_label":"Parent Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesTwoMember","member_label":"Revolving Credit Facilities December 14, 2027"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-203","char_anchor":"f-944","text_snippet":"515","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-205","char_anchor":"f-955","text_snippet":"520","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":515,"prior_value":520.0},{"tag":"us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Remaining Borrowing Capacity","current_period_value":62,"prior_period_value":null,"visual_current_value":62,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesFourMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesFourMember","member_label":"Revolving Credit Facilities May 30, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-205","char_anchor":"f-952","text_snippet":"62","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":62,"prior_value":null},{"tag":"us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Remaining Borrowing Capacity","current_period_value":7,"prior_period_value":null,"visual_current_value":7,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=cms:NorthStarCleanEnergyIncludingSubsidiariesMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesThreeMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"cms:NorthStarCleanEnergyIncludingSubsidiariesMember","member_label":"NorthStar Clean Energy, Including Subsidiaries"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesThreeMember","member_label":"Revolving Credit Facilities Upon Completion of Construction Project"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-207","char_anchor":"f-960","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":null},{"tag":"us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity","date_type":"Q","period_type":"instant","presentation_role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","presentation_hierarchy":[{"role":"financingsandcapitalizationscheduleofrevolvingcreditfacilitiesdetails","parent":"us-gaap:LineOfCreditFacilityLineItems","order":4.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Line of Credit Facility, Remaining Borrowing Capacity","current_period_value":8,"prior_period_value":null,"visual_current_value":8,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:LineOfCreditFacilityAxis=cms:RevolvingCreditFacilitiesEightMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:LineOfCreditFacilityAxis","axis_label":"Line Of Credit Facility","member":"cms:RevolvingCreditFacilitiesEightMember","member_label":"Revolving Credit Facilities March 31, 2028"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-210","char_anchor":"f-972","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":null},{"tag":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncomeTaxesLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Percent","current_period_value":20.3,"prior_period_value":15.3,"visual_current_value":20.3,"visual_prior_value":15.3,"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-1276","text_snippet":"20.3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1277","text_snippet":"15.3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":20.3,"prior_value":15.3},{"tag":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncomeTaxesLineItems","order":3.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,3.0,2],"section_concept":null,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Percent","current_period_value":20.7,"prior_period_value":16.1,"visual_current_value":20.7,"visual_prior_value":16.1,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1290","text_snippet":"20.7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1291","text_snippet":"16.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":20.7,"prior_value":16.1},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncomeTaxesLineItems","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":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent","current_period_value":21,"prior_period_value":21.0,"visual_current_value":21,"visual_prior_value":21.0,"end_current":"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-1262","text_snippet":"21.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1263","text_snippet":"21.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":21,"prior_value":21.0},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncomeTaxesLineItems","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":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":1.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent","current_period_value":21,"prior_period_value":21.0,"visual_current_value":21,"visual_prior_value":21.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1278","text_snippet":"21.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1279","text_snippet":"21.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":21,"prior_value":21.0},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":4.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent","current_period_value":-3.5,"prior_period_value":-3.8,"visual_current_value":-3.5,"visual_prior_value":-3.8,"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-1268","text_snippet":"3.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1269","text_snippet":"3.8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":-3.5,"prior_value":-3.8},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":4.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent","current_period_value":-3,"prior_period_value":-3.5,"visual_current_value":-3,"visual_prior_value":-3.5,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1284","text_snippet":"3.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1285","text_snippet":"3.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":-3,"prior_value":-3.5},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":5.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,5.0,4],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":-1.0,"order":6.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":-1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent","current_period_value":-1.2,"prior_period_value":-1.1,"visual_current_value":1.2,"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-1","char_anchor":"f-1272","text_snippet":"1.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1273","text_snippet":"1.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":1.2,"prior_value":1.1},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","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,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":7.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":7.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Other Adjustments, Percent","current_period_value":0.1,"prior_period_value":-0.2,"visual_current_value":0.1,"visual_prior_value":-0.2,"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-1274","text_snippet":"0.1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1275","text_snippet":"0.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":0.1,"prior_value":-0.2},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","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,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":7.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":7.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Other Adjustments, Percent","current_period_value":-0.2,"prior_period_value":-0.2,"visual_current_value":-0.2,"visual_prior_value":-0.2,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1288","text_snippet":"0.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1289","text_snippet":"0.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":-0.2,"prior_value":-0.2},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":2.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent","current_period_value":7.2,"prior_period_value":5.4,"visual_current_value":7.2,"visual_prior_value":5.4,"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-1264","text_snippet":"7.2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1265","text_snippet":"5.4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":7.2,"prior_value":5.4},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":1.0,"order":2.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent","current_period_value":6.5,"prior_period_value":5.0,"visual_current_value":6.5,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1280","text_snippet":"6.5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1281","text_snippet":"5.0","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"hundredths","current_value":6.5,"prior_value":5.0},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsOther","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":-1.0,"order":3.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent","current_period_value":5.7,"prior_period_value":6.3,"visual_current_value":-5.7,"visual_prior_value":-6.3,"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-1266","text_snippet":"5.7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1267","text_snippet":"6.3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":-5.7,"prior_value":-6.3},{"tag":"us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsOther","date_type":"YTD","period_type":"duration","presentation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","presentation_hierarchy":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"cms:IncreaseDecreaseInIncomeTaxExpenseAbstract","order":2.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,3.0,2,2.0,1,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","weight":-1.0,"order":3.0}],"calculation_role":"incometaxesscheduleofeffectiveincomeratereconciliationdetails","calculation_parent":"us-gaap:EffectiveIncomeTaxRateContinuingOperations","calculation_weight":-1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent","current_period_value":3.6,"prior_period_value":4.4,"visual_current_value":-3.6,"visual_prior_value":-4.4,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1282","text_snippet":"3.6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1283","text_snippet":"4.4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":-3.6,"prior_value":-4.4},{"tag":"us-gaap:RegulatoryAssets","date_type":"Q","period_type":"instant","presentation_role":"regulatorymattersnarrativedetails|variableinterestentitiesnarrativedetails","presentation_hierarchy":[{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Regulatory Asset","current_period_value":54,"prior_period_value":null,"visual_current_value":54,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RegulatoryAssetAxis=cms:ServiceRestorationCostDeferralApplicationMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RegulatoryAssetAxis","axis_label":"Regulatory Asset","member":"cms:ServiceRestorationCostDeferralApplicationMember","member_label":"Service Restoration Cost Deferral Application"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-162","char_anchor":"f-858","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":54,"prior_value":null},{"tag":"us-gaap:RegulatoryAssets","date_type":"Q","period_type":"instant","presentation_role":"regulatorymattersnarrativedetails|variableinterestentitiesnarrativedetails","presentation_hierarchy":[{"role":"regulatorymattersnarrativedetails","parent":"us-gaap:PublicUtilitiesGeneralDisclosuresLineItems","order":9.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,4.0,3,9.0,8],"section_concept":null,"section_label":null},{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,4.0,3],"section_concept":null,"section_label":null}],"concept_label":"Regulatory Asset","current_period_value":580,"prior_period_value":null,"visual_current_value":580,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2268","text_snippet":"580","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":0,"scale":"millions","current_value":580,"prior_value":null},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":687,"prior_period_value":560.0,"visual_current_value":687,"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-11","char_anchor":"f-1555","text_snippet":"687","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1732","text_snippet":"560","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":687,"prior_value":560.0},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":624,"prior_period_value":515.0,"visual_current_value":624,"visual_prior_value":515.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-1655","text_snippet":"624","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-1832","text_snippet":"515","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":624,"prior_value":515.0},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":624,"prior_period_value":515.0,"visual_current_value":624,"visual_prior_value":515.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-395","char_anchor":"f-1653","text_snippet":"624","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-413","char_anchor":"f-1830","text_snippet":"515","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":624,"prior_value":515.0},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":624,"prior_period_value":515.0,"visual_current_value":624,"visual_prior_value":515.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1651","text_snippet":"624","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1828","text_snippet":"515","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":624,"prior_value":515.0},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":687,"prior_period_value":560.0,"visual_current_value":687,"visual_prior_value":560.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1553","text_snippet":"687","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1730","text_snippet":"560","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":687,"prior_value":560.0},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":624,"prior_period_value":515.0,"visual_current_value":624,"visual_prior_value":515.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1550","text_snippet":"624","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1727","text_snippet":"515","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":624,"prior_value":515.0},{"tag":"cms:PowerSupplyCosts","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":63,"prior_period_value":45.0,"visual_current_value":63,"visual_prior_value":45.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1552","text_snippet":"63","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1729","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":63,"prior_value":45.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":1905,"prior_period_value":1527.0,"visual_current_value":1905,"visual_prior_value":1527.0,"end_current":"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-1909","text_snippet":"1,905","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-2074","text_snippet":"1,527","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1905,"prior_value":1527.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":1707,"prior_period_value":1408.0,"visual_current_value":1707,"visual_prior_value":1408.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1997","text_snippet":"1,707","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-2162","text_snippet":"1,408","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1707,"prior_value":1408.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":1707,"prior_period_value":1408.0,"visual_current_value":1707,"visual_prior_value":1408.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-1995","text_snippet":"1,707","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2160","text_snippet":"1,408","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1707,"prior_value":1408.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":1707,"prior_period_value":1408.0,"visual_current_value":1707,"visual_prior_value":1408.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-1993","text_snippet":"1,707","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2158","text_snippet":"1,408","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1707,"prior_value":1408.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":1905,"prior_period_value":1527.0,"visual_current_value":1905,"visual_prior_value":1527.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1907","text_snippet":"1,905","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2072","text_snippet":"1,527","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1905,"prior_value":1527.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":1707,"prior_period_value":1408.0,"visual_current_value":1707,"visual_prior_value":1408.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1904","text_snippet":"1,707","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2069","text_snippet":"1,408","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1707,"prior_value":1408.0},{"tag":"cms:PowerSupplyCosts","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","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},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","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":"Power supply cost","current_period_value":198,"prior_period_value":119.0,"visual_current_value":198,"visual_prior_value":119.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1906","text_snippet":"198","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2071","text_snippet":"119","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":198,"prior_value":119.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","current_period_value":-3,"prior_period_value":-4.0,"visual_current_value":3,"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-11","char_anchor":"f-1627","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1804","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":4.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-384","char_anchor":"f-1626","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1803","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-2,"prior_value":-2.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-383","char_anchor":"f-1625","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1802","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":6.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"Q","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1624","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1801","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":6.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","current_period_value":-15,"prior_period_value":-39.0,"visual_current_value":15,"visual_prior_value":39.0,"end_current":"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":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-2146","text_snippet":"39","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":15,"prior_value":39.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-2057","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-2222","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-426","char_anchor":"f-2055","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-435","char_anchor":"f-2220","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-2053","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-2218","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","current_period_value":7,"prior_period_value":7.0,"visual_current_value":-7,"visual_prior_value":-7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:CorporateNonSegmentMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:CorporateNonSegmentMember","member_label":"Corporate Non Segment"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-420","char_anchor":"f-1980","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-429","char_anchor":"f-2145","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-7,"prior_value":-7.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","current_period_value":-22,"prior_period_value":-46.0,"visual_current_value":22,"visual_prior_value":46.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-419","char_anchor":"f-1979","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-428","char_anchor":"f-2144","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":22,"prior_value":46.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","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|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1976","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-2141","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":-1.0},{"tag":"us-gaap:SegmentReportingOtherItemAmount","date_type":"YTD","period_type":"duration","presentation_role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails|reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","presentation_hierarchy":[{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentsconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null},{"role":"reportablesegmentsscheduleoffinancialinformationbyreportablesegmentscmsenergyincludingconsumersdetails","parent":"us-gaap:SegmentReportingInformationLineItems","order":14.0,"preferred_label_role":"negatedTerseLabel","global_sort_position":[0,1.0,0,4.0,3,14.0,13],"section_concept":null,"section_label":null}],"concept_label":"Segment Reporting, Other Segment Item, Amount","current_period_value":-23,"prior_period_value":-47.0,"visual_current_value":23,"visual_prior_value":47.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1978","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-2143","text_snippet":"47","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":23,"prior_value":47.0},{"tag":"cms:DefinedBenefitPlanDeferredCreditsCosts","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsnarrativedetails","presentation_hierarchy":[{"role":"retirementbenefitsnarrativedetails","parent":"us-gaap:DefinedBenefitPlanDisclosureLineItems","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":"Deferred credits (costs)","current_period_value":7,"prior_period_value":8.0,"visual_current_value":7,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RegulatoryLiabilityAxis=cms:VolatilityMechanismMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RegulatoryLiabilityAxis","axis_label":"Regulatory Liability","member":"cms:VolatilityMechanismMember","member_label":"Volatility Mechanism"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-300","char_anchor":"f-1255","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-302","char_anchor":"f-1257","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":8.0},{"tag":"cms:DefinedBenefitPlanDeferredCreditsCosts","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsnarrativedetails","presentation_hierarchy":[{"role":"retirementbenefitsnarrativedetails","parent":"us-gaap:DefinedBenefitPlanDisclosureLineItems","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":"Deferred credits (costs)","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:RegulatoryAssetAxis=cms:VolatilityMechanismMember|us-gaap:RetirementPlanTypeAxis=us-gaap:PensionPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RegulatoryAssetAxis","axis_label":"Regulatory Asset","member":"cms:VolatilityMechanismMember","member_label":"Volatility Mechanism"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:PensionPlansDefinedBenefitMember","member_label":"Pension Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-299","char_anchor":"f-1254","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":-1,"prior_value":null},{"tag":"cms:DefinedBenefitPlanAmortizationOfSettlementLoss","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":5.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Settlement 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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1238","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1239","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"cms:DefinedBenefitPlanAmortizationOfSettlementLoss","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":5.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Settlement 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:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1182","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1183","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"cms:DefinedBenefitPlanAmortizationOfSettlementLoss","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":5.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Settlement loss","current_period_value":8,"prior_period_value":8.0,"visual_current_value":8,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1240","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1241","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":8.0},{"tag":"cms:DefinedBenefitPlanAmortizationOfSettlementLoss","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":5.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":5.0,"section_label":null}],"concept_label":"Settlement loss","current_period_value":8,"prior_period_value":8.0,"visual_current_value":8,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1184","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1185","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":8.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":4.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of 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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1222","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1223","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":3.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":4.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Gain (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:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1166","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1167","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":4.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Gain (Loss)","current_period_value":-7,"prior_period_value":-8.0,"visual_current_value":7,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1224","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1225","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":8.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":4.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of 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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-297","char_anchor":"f-1228","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-298","char_anchor":"f-1229","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":3.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":4.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Gain (Loss)","current_period_value":-8,"prior_period_value":-9.0,"visual_current_value":8,"visual_prior_value":9.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1168","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1169","text_snippet":"9","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":8,"prior_value":9.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":1.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":4.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of 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:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-289","char_anchor":"f-1172","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-290","char_anchor":"f-1173","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":3.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1230","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1231","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","current_period_value":-8,"prior_period_value":-8.0,"visual_current_value":-8,"visual_prior_value":-8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-295","char_anchor":"f-1234","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-296","char_anchor":"f-1235","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":-8.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","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:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1174","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1175","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","current_period_value":-8,"prior_period_value":-7.0,"visual_current_value":-8,"visual_prior_value":-7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-287","char_anchor":"f-1178","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-288","char_anchor":"f-1179","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-8,"prior_value":-7.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1232","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1233","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","current_period_value":-25,"prior_period_value":-23.0,"visual_current_value":-25,"visual_prior_value":-23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-297","char_anchor":"f-1236","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-298","char_anchor":"f-1237","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-25,"prior_value":-23.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","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:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1176","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1177","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":3.0},{"tag":"us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"cms:DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAbstract","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,4.0,3,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":2.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Amortization of Prior Service Cost (Credit)","current_period_value":-25,"prior_period_value":-23.0,"visual_current_value":-25,"visual_prior_value":-23.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-289","char_anchor":"f-1180","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-290","char_anchor":"f-1181","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-25,"prior_value":-23.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":54,"prior_period_value":56.0,"visual_current_value":-54,"visual_prior_value":-56.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1214","text_snippet":"54","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1215","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-54,"prior_value":-56.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":26,"prior_period_value":26.0,"visual_current_value":-26,"visual_prior_value":-26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-295","char_anchor":"f-1218","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-296","char_anchor":"f-1219","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-26,"prior_value":-26.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":57,"prior_period_value":58.0,"visual_current_value":-57,"visual_prior_value":-58.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1158","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1159","text_snippet":"58","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-57,"prior_value":-58.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":27,"prior_period_value":28.0,"visual_current_value":-27,"visual_prior_value":-28.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-287","char_anchor":"f-1162","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-288","char_anchor":"f-1163","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-27,"prior_value":-28.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":162,"prior_period_value":166.0,"visual_current_value":-162,"visual_prior_value":-166.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1216","text_snippet":"162","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1217","text_snippet":"166","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-162,"prior_value":-166.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":78,"prior_period_value":80.0,"visual_current_value":-78,"visual_prior_value":-80.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-297","char_anchor":"f-1220","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-298","char_anchor":"f-1221","text_snippet":"80","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-78,"prior_value":-80.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":171,"prior_period_value":176.0,"visual_current_value":-171,"visual_prior_value":-176.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1160","text_snippet":"171","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1161","text_snippet":"176","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-171,"prior_value":-176.0},{"tag":"us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":3.0,"preferred_label_role":"negatedLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":-1.0,"order":1.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":-1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","current_period_value":83,"prior_period_value":86.0,"visual_current_value":-83,"visual_prior_value":-86.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-289","char_anchor":"f-1164","text_snippet":"83","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-290","char_anchor":"f-1165","text_snippet":"86","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-83,"prior_value":-86.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":26,"prior_period_value":25.0,"visual_current_value":26,"visual_prior_value":25.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1206","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1207","text_snippet":"25","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":26,"prior_value":25.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":11,"prior_period_value":11.0,"visual_current_value":11,"visual_prior_value":11.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-295","char_anchor":"f-1210","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-296","char_anchor":"f-1211","text_snippet":"11","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":11,"prior_value":11.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":27,"prior_period_value":26.0,"visual_current_value":27,"visual_prior_value":26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1150","text_snippet":"27","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1151","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":27,"prior_value":26.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":10,"prior_period_value":10.0,"visual_current_value":10,"visual_prior_value":10.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-287","char_anchor":"f-1154","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-288","char_anchor":"f-1155","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":10.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":77,"prior_period_value":74.0,"visual_current_value":77,"visual_prior_value":74.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1208","text_snippet":"77","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1209","text_snippet":"74","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":77,"prior_value":74.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":32,"prior_period_value":31.0,"visual_current_value":32,"visual_prior_value":31.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-297","char_anchor":"f-1212","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-298","char_anchor":"f-1213","text_snippet":"31","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":32,"prior_value":31.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":81,"prior_period_value":78.0,"visual_current_value":81,"visual_prior_value":78.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1152","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1153","text_snippet":"78","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":81,"prior_value":78.0},{"tag":"us-gaap:DefinedBenefitPlanInterestCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","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":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":6.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":6.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Interest Cost","current_period_value":32,"prior_period_value":32.0,"visual_current_value":32,"visual_prior_value":32.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-289","char_anchor":"f-1156","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-290","char_anchor":"f-1157","text_snippet":"32","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":32,"prior_value":32.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1246","text_snippet":"16","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1247","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-16,"prior_value":-17.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-21,"prior_period_value":-20.0,"visual_current_value":-21,"visual_prior_value":-20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-295","char_anchor":"f-1250","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-296","char_anchor":"f-1251","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-21,"prior_value":-20.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-17,"prior_period_value":-18.0,"visual_current_value":-17,"visual_prior_value":-18.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1190","text_snippet":"17","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1191","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-17,"prior_value":-18.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-23,"prior_period_value":-22.0,"visual_current_value":-23,"visual_prior_value":-22.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-287","char_anchor":"f-1194","text_snippet":"23","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-288","char_anchor":"f-1195","text_snippet":"22","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-23,"prior_value":-22.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-49,"prior_period_value":-53.0,"visual_current_value":-49,"visual_prior_value":-53.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1248","text_snippet":"49","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1249","text_snippet":"53","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-49,"prior_value":-53.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-63,"prior_period_value":-61.0,"visual_current_value":-63,"visual_prior_value":-61.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-297","char_anchor":"f-1252","text_snippet":"63","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-298","char_anchor":"f-1253","text_snippet":"61","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-63,"prior_value":-61.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-52,"prior_period_value":-57.0,"visual_current_value":-52,"visual_prior_value":-57.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1192","text_snippet":"52","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1193","text_snippet":"57","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":-52,"prior_value":-57.0},{"tag":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":5.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit)","current_period_value":-68,"prior_period_value":-66.0,"visual_current_value":-68,"visual_prior_value":-66.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-289","char_anchor":"f-1196","text_snippet":"68","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-290","char_anchor":"f-1197","text_snippet":"66","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":-68,"prior_value":-66.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","current_period_value":6,"prior_period_value":7.0,"visual_current_value":6,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-291","char_anchor":"f-1198","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-292","char_anchor":"f-1199","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":7.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-295","char_anchor":"f-1202","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-296","char_anchor":"f-1203","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":2.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","current_period_value":6,"prior_period_value":7.0,"visual_current_value":6,"visual_prior_value":7.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-283","char_anchor":"f-1142","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-284","char_anchor":"f-1143","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":7.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"Q","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","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":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-287","char_anchor":"f-1146","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-288","char_anchor":"f-1147","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":2.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","current_period_value":18,"prior_period_value":20.0,"visual_current_value":18,"visual_prior_value":20.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-293","char_anchor":"f-1200","text_snippet":"18","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-294","char_anchor":"f-1201","text_snippet":"20","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":18,"prior_value":20.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","current_period_value":6,"prior_period_value":8.0,"visual_current_value":6,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-297","char_anchor":"f-1204","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-298","char_anchor":"f-1205","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":8.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","current_period_value":19,"prior_period_value":21.0,"visual_current_value":19,"visual_prior_value":21.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=cms:PensionAndDBSERPMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"cms:PensionAndDBSERPMember","member_label":"DB Pension Plans"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-285","char_anchor":"f-1144","text_snippet":"19","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-286","char_anchor":"f-1145","text_snippet":"21","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":19,"prior_value":21.0},{"tag":"us-gaap:DefinedBenefitPlanServiceCost","date_type":"YTD","period_type":"duration","presentation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","presentation_hierarchy":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanRollForwardsAbstract","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,3.0,2,1.0,0,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"retirementbenefitsscheduleofnetbenefitcostsdetails","parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","weight":1.0,"order":3.0}],"calculation_role":"retirementbenefitsscheduleofnetbenefitcostsdetails","calculation_parent":"us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Defined Benefit Plan, Service Cost","current_period_value":6,"prior_period_value":8.0,"visual_current_value":6,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:RetirementPlanTypeAxis=us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","dimensions":[{"axis":"us-gaap:RetirementPlanTypeAxis","axis_label":"Retirement Plan Type","member":"us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember","member_label":"Other Postretirement Benefit Plans Defined Benefit"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-289","char_anchor":"f-1148","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-290","char_anchor":"f-1149","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":8.0},{"tag":"cms:AlternativeRevenuePrograms","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Alternative-revenue programs","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-1357","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-1403","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":1.0},{"tag":"cms:AlternativeRevenuePrograms","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Alternative-revenue programs","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1355","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1401","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":1.0},{"tag":"cms:AlternativeRevenuePrograms","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Alternative-revenue programs","current_period_value":6,"prior_period_value":5.0,"visual_current_value":6,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1448","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1494","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":5.0},{"tag":"cms:AlternativeRevenuePrograms","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":4.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,4.0,3],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":4.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":4.0,"section_label":null}],"concept_label":"Alternative-revenue programs","current_period_value":6,"prior_period_value":5.0,"visual_current_value":6,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-1446","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-1492","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":5.0},{"tag":"cms:FinancingIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":3,"prior_period_value":5.0,"visual_current_value":3,"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-11","char_anchor":"f-1354","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1400","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":5.0},{"tag":"cms:FinancingIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":3,"prior_period_value":5.0,"visual_current_value":3,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-1379","text_snippet":"3","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-1425","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":3,"prior_value":5.0},{"tag":"cms:FinancingIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":2,"prior_period_value":4.0,"visual_current_value":2,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1377","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1423","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":4.0},{"tag":"cms:FinancingIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1378","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1424","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"cms:FinancingIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":2,"prior_period_value":4.0,"visual_current_value":2,"visual_prior_value":4.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1352","text_snippet":"2","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1398","text_snippet":"4","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":2,"prior_value":4.0},{"tag":"cms:FinancingIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","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|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1353","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1399","text_snippet":"1","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1,"prior_value":1.0},{"tag":"cms:FinancingIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":12,"prior_period_value":13.0,"visual_current_value":12,"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-1445","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1491","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":13.0},{"tag":"cms:FinancingIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":12,"prior_period_value":13.0,"visual_current_value":12,"visual_prior_value":13.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1470","text_snippet":"12","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1516","text_snippet":"13","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":12,"prior_value":13.0},{"tag":"cms:FinancingIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":7,"prior_period_value":8.0,"visual_current_value":7,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-1468","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-1514","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":8.0},{"tag":"cms:FinancingIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-1469","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-1515","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":5.0},{"tag":"cms:FinancingIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","current_period_value":7,"prior_period_value":8.0,"visual_current_value":7,"visual_prior_value":8.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1443","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-1489","text_snippet":"8","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":7,"prior_value":8.0},{"tag":"cms:FinancingIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,3.0,2],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":3.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":3.0,"section_label":null}],"concept_label":"Financing income","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":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1444","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-1490","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":5,"prior_value":5.0},{"tag":"us-gaap:LeaseIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Lease Income","current_period_value":41,"prior_period_value":26.0,"visual_current_value":41,"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-11","char_anchor":"f-1351","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1397","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":41,"prior_value":26.0},{"tag":"us-gaap:LeaseIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Lease Income","current_period_value":41,"prior_period_value":26.0,"visual_current_value":41,"visual_prior_value":26.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1350","text_snippet":"41","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1396","text_snippet":"26","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":41,"prior_value":26.0},{"tag":"us-gaap:LeaseIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Lease Income","current_period_value":117,"prior_period_value":77.0,"visual_current_value":117,"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-1442","text_snippet":"117","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1488","text_snippet":"77","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":117,"prior_value":77.0},{"tag":"us-gaap:LeaseIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":2.0,"preferred_label_role":"verboseLabel","global_sort_position":[0,1.0,0,6.0,5,2.0,1],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":2.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":2.0,"section_label":null}],"concept_label":"Lease Income","current_period_value":117,"prior_period_value":77.0,"visual_current_value":117,"visual_prior_value":77.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1441","text_snippet":"117","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-1487","text_snippet":"77","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":117,"prior_value":77.0},{"tag":"us-gaap:OperatingLeaseVariableLeaseIncome","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Operating Lease, Variable Lease Income","current_period_value":28,"prior_period_value":15.0,"visual_current_value":28,"visual_prior_value":15.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1386","text_snippet":"28","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1431","text_snippet":"15","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":28,"prior_value":15.0},{"tag":"us-gaap:OperatingLeaseVariableLeaseIncome","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Operating Lease, Variable Lease Income","current_period_value":82,"prior_period_value":44.0,"visual_current_value":82,"visual_prior_value":44.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:FairValueByAssetClassAxis=cms:PowerSalesAgreementMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:FairValueByAssetClassAxis","axis_label":"Fair Value By Asset Class","member":"cms:PowerSalesAgreementMember","member_label":"Power Sales Agreement"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-362","char_anchor":"f-1477","text_snippet":"82","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-382","char_anchor":"f-1523","text_snippet":"44","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":82,"prior_value":44.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1975,"prior_period_value":1711.0,"visual_current_value":1975,"visual_prior_value":1711.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-11","char_anchor":"f-1349","text_snippet":"1,975","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1395","text_snippet":"1,711","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":1975,"prior_value":1711.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1908,"prior_period_value":1655.0,"visual_current_value":1908,"visual_prior_value":1655.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-1343","text_snippet":"1,908","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-1389","text_snippet":"1,655","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1908,"prior_value":1655.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":577,"prior_period_value":486.0,"visual_current_value":577,"visual_prior_value":486.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:CommercialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:CommercialUtilityServiceMember","member_label":"Commercial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-315","char_anchor":"f-1365","text_snippet":"577","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-334","char_anchor":"f-1411","text_snippet":"486","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":577,"prior_value":486.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":45,"prior_period_value":40.0,"visual_current_value":45,"visual_prior_value":40.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:CommercialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:CommercialUtilityServiceMember","member_label":"Commercial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-316","char_anchor":"f-1366","text_snippet":"45","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-335","char_anchor":"f-1412","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":45,"prior_value":40.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":204,"prior_period_value":169.0,"visual_current_value":204,"visual_prior_value":169.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:IndustrialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:IndustrialUtilityServiceMember","member_label":"Industrial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-318","char_anchor":"f-1368","text_snippet":"204","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-337","char_anchor":"f-1414","text_snippet":"169","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":204,"prior_value":169.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":6,"prior_period_value":5.0,"visual_current_value":6,"visual_prior_value":5.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:IndustrialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:IndustrialUtilityServiceMember","member_label":"Industrial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-319","char_anchor":"f-1369","text_snippet":"6","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-338","char_anchor":"f-1415","text_snippet":"5","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":6,"prior_value":5.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":52,"prior_period_value":81.0,"visual_current_value":52,"visual_prior_value":81.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-321","char_anchor":"f-1371","text_snippet":"52","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-340","char_anchor":"f-1417","text_snippet":"81","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":52,"prior_value":81.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":43,"prior_period_value":40.0,"visual_current_value":43,"visual_prior_value":40.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-322","char_anchor":"f-1372","text_snippet":"43","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-341","char_anchor":"f-1418","text_snippet":"40","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":43,"prior_value":40.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":842,"prior_period_value":707.0,"visual_current_value":842,"visual_prior_value":707.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:ResidentialUtilityServicesMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:ResidentialUtilityServicesMember","member_label":"Residential"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-312","char_anchor":"f-1362","text_snippet":"842","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-331","char_anchor":"f-1408","text_snippet":"707","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":842,"prior_value":707.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":139,"prior_period_value":127.0,"visual_current_value":139,"visual_prior_value":127.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:ResidentialUtilityServicesMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:ResidentialUtilityServicesMember","member_label":"Residential"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-313","char_anchor":"f-1363","text_snippet":"139","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-332","char_anchor":"f-1409","text_snippet":"127","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":139,"prior_value":127.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1675,"prior_period_value":1443.0,"visual_current_value":1675,"visual_prior_value":1443.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-305","char_anchor":"f-1341","text_snippet":"1,675","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-324","char_anchor":"f-1387","text_snippet":"1,443","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1675,"prior_value":1443.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":233,"prior_period_value":212.0,"visual_current_value":233,"visual_prior_value":212.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-306","char_anchor":"f-1342","text_snippet":"233","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-325","char_anchor":"f-1388","text_snippet":"212","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":233,"prior_value":212.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":622,"prior_period_value":526.0,"visual_current_value":622,"visual_prior_value":526.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:CommercialUtilityServiceMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:CommercialUtilityServiceMember","member_label":"Commercial"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-317","char_anchor":"f-1367","text_snippet":"622","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-336","char_anchor":"f-1413","text_snippet":"526","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":622,"prior_value":526.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":210,"prior_period_value":174.0,"visual_current_value":210,"visual_prior_value":174.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:IndustrialUtilityServiceMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:IndustrialUtilityServiceMember","member_label":"Industrial"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-320","char_anchor":"f-1370","text_snippet":"210","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-339","char_anchor":"f-1416","text_snippet":"174","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":210,"prior_value":174.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":95,"prior_period_value":121.0,"visual_current_value":95,"visual_prior_value":121.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-323","char_anchor":"f-1373","text_snippet":"95","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-342","char_anchor":"f-1419","text_snippet":"121","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":95,"prior_value":121.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":981,"prior_period_value":834.0,"visual_current_value":981,"visual_prior_value":834.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:ResidentialUtilityServicesMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:ResidentialUtilityServicesMember","member_label":"Residential"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-314","char_anchor":"f-1364","text_snippet":"981","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-333","char_anchor":"f-1410","text_snippet":"834","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":981,"prior_value":834.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":67,"prior_period_value":56.0,"visual_current_value":67,"visual_prior_value":56.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-307","char_anchor":"f-1344","text_snippet":"67","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-326","char_anchor":"f-1390","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":67,"prior_value":56.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1675,"prior_period_value":1443.0,"visual_current_value":1675,"visual_prior_value":1443.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-309","char_anchor":"f-1346","text_snippet":"1,675","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-328","char_anchor":"f-1392","text_snippet":"1,443","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1675,"prior_value":1443.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":233,"prior_period_value":212.0,"visual_current_value":233,"visual_prior_value":212.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-310","char_anchor":"f-1347","text_snippet":"233","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-329","char_anchor":"f-1393","text_snippet":"212","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":233,"prior_value":212.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":67,"prior_period_value":56.0,"visual_current_value":67,"visual_prior_value":56.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-311","char_anchor":"f-1348","text_snippet":"67","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-330","char_anchor":"f-1394","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":67,"prior_value":56.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"Q","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":67,"prior_period_value":56.0,"visual_current_value":67,"visual_prior_value":56.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-308","char_anchor":"f-1345","text_snippet":"67","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-327","char_anchor":"f-1391","text_snippet":"56","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":67,"prior_value":56.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":6171,"prior_period_value":5431.0,"visual_current_value":6171,"visual_prior_value":5431.0,"end_current":"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-1440","text_snippet":"6,171","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1486","text_snippet":"5,431","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":6171,"prior_value":5431.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":5989,"prior_period_value":5273.0,"visual_current_value":5989,"visual_prior_value":5273.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1434","text_snippet":"5,989","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1480","text_snippet":"5,273","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":5989,"prior_value":5273.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1468,"prior_period_value":1279.0,"visual_current_value":1468,"visual_prior_value":1279.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:CommercialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:CommercialUtilityServiceMember","member_label":"Commercial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-353","char_anchor":"f-1456","text_snippet":"1,468","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-373","char_anchor":"f-1502","text_snippet":"1,279","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1468,"prior_value":1279.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":374,"prior_period_value":311.0,"visual_current_value":374,"visual_prior_value":311.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:CommercialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:CommercialUtilityServiceMember","member_label":"Commercial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-354","char_anchor":"f-1457","text_snippet":"374","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-374","char_anchor":"f-1503","text_snippet":"311","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":374,"prior_value":311.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":576,"prior_period_value":499.0,"visual_current_value":576,"visual_prior_value":499.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:IndustrialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:IndustrialUtilityServiceMember","member_label":"Industrial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-356","char_anchor":"f-1459","text_snippet":"576","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-376","char_anchor":"f-1505","text_snippet":"499","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":576,"prior_value":499.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":46,"prior_period_value":37.0,"visual_current_value":46,"visual_prior_value":37.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:IndustrialUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:IndustrialUtilityServiceMember","member_label":"Industrial"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-357","char_anchor":"f-1460","text_snippet":"46","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-377","char_anchor":"f-1506","text_snippet":"37","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":46,"prior_value":37.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":225,"prior_period_value":236.0,"visual_current_value":225,"visual_prior_value":236.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-359","char_anchor":"f-1462","text_snippet":"225","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-379","char_anchor":"f-1508","text_snippet":"236","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":225,"prior_value":236.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":99,"prior_period_value":134.0,"visual_current_value":99,"visual_prior_value":134.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-360","char_anchor":"f-1463","text_snippet":"99","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-380","char_anchor":"f-1509","text_snippet":"134","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":99,"prior_value":134.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":2055,"prior_period_value":1779.0,"visual_current_value":2055,"visual_prior_value":1779.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:ResidentialUtilityServicesMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:ResidentialUtilityServicesMember","member_label":"Residential"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-350","char_anchor":"f-1453","text_snippet":"2,055","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-370","char_anchor":"f-1499","text_snippet":"1,779","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":2055,"prior_value":1779.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1146,"prior_period_value":998.0,"visual_current_value":1146,"visual_prior_value":998.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:ResidentialUtilityServicesMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:ResidentialUtilityServicesMember","member_label":"Residential"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-351","char_anchor":"f-1454","text_snippet":"1,146","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-371","char_anchor":"f-1500","text_snippet":"998","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1146,"prior_value":998.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":4324,"prior_period_value":3793.0,"visual_current_value":4324,"visual_prior_value":3793.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-343","char_anchor":"f-1432","text_snippet":"4,324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-363","char_anchor":"f-1478","text_snippet":"3,793","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":4324,"prior_value":3793.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1665,"prior_period_value":1480.0,"visual_current_value":1665,"visual_prior_value":1480.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-344","char_anchor":"f-1433","text_snippet":"1,665","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-364","char_anchor":"f-1479","text_snippet":"1,480","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1665,"prior_value":1480.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1842,"prior_period_value":1590.0,"visual_current_value":1842,"visual_prior_value":1590.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:CommercialUtilityServiceMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:CommercialUtilityServiceMember","member_label":"Commercial"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-355","char_anchor":"f-1458","text_snippet":"1,842","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-375","char_anchor":"f-1504","text_snippet":"1,590","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1842,"prior_value":1590.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":622,"prior_period_value":536.0,"visual_current_value":622,"visual_prior_value":536.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:IndustrialUtilityServiceMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:IndustrialUtilityServiceMember","member_label":"Industrial"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-358","char_anchor":"f-1461","text_snippet":"622","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-378","char_anchor":"f-1507","text_snippet":"536","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":622,"prior_value":536.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":324,"prior_period_value":370.0,"visual_current_value":324,"visual_prior_value":370.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-361","char_anchor":"f-1464","text_snippet":"324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-381","char_anchor":"f-1510","text_snippet":"370","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":324,"prior_value":370.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":3201,"prior_period_value":2777.0,"visual_current_value":3201,"visual_prior_value":2777.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember|srt:ProductOrServiceAxis=cms:ResidentialUtilityServicesMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:ResidentialUtilityServicesMember","member_label":"Residential"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-352","char_anchor":"f-1455","text_snippet":"3,201","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-372","char_anchor":"f-1501","text_snippet":"2,777","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":3201,"prior_value":2777.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":182,"prior_period_value":158.0,"visual_current_value":182,"visual_prior_value":158.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-345","char_anchor":"f-1435","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-365","char_anchor":"f-1481","text_snippet":"158","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":182,"prior_value":158.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":4324,"prior_period_value":3793.0,"visual_current_value":4324,"visual_prior_value":3793.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:ElectricUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:ElectricUtilityMember","member_label":"Electric Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-347","char_anchor":"f-1437","text_snippet":"4,324","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-367","char_anchor":"f-1483","text_snippet":"3,793","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":4324,"prior_value":3793.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":1665,"prior_period_value":1480.0,"visual_current_value":1665,"visual_prior_value":1480.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:GasUtilityMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:GasUtilityMember","member_label":"Gas Utility"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-348","char_anchor":"f-1438","text_snippet":"1,665","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-368","char_anchor":"f-1484","text_snippet":"1,480","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":1665,"prior_value":1480.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":182,"prior_period_value":158.0,"visual_current_value":182,"visual_prior_value":158.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember|us-gaap:StatementBusinessSegmentsAxis=cms:NorthStarCleanEnergyMember","dimensions":[{"axis":"srt:ConsolidationItemsAxis","axis_label":"Consolidation Items","member":"us-gaap:OperatingSegmentsMember","member_label":"Operating Segments"},{"axis":"us-gaap:StatementBusinessSegmentsAxis","axis_label":"Business Segments","member":"cms:NorthStarCleanEnergyMember","member_label":"NorthStar Clean Energy"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-349","char_anchor":"f-1439","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-369","char_anchor":"f-1485","text_snippet":"158","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":182,"prior_value":158.0},{"tag":"us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax","date_type":"YTD","period_type":"duration","presentation_role":"revenuedisaggregationofrevenuedetails","presentation_hierarchy":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,6.0,5,1.0,0],"section_concept":null,"calculation_relationships":[{"role":"revenuedisaggregationofrevenuedetails","parent":"us-gaap:Revenues","weight":1.0,"order":1.0}],"calculation_role":"revenuedisaggregationofrevenuedetails","calculation_parent":"us-gaap:Revenues","calculation_weight":1.0,"calculation_order":1.0,"section_label":null}],"concept_label":"Revenue from Contract with Customer, Excluding Assessed Tax","current_period_value":182,"prior_period_value":158.0,"visual_current_value":182,"visual_prior_value":158.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ProductOrServiceAxis=cms:OtherUtilityServiceMember","dimensions":[{"axis":"srt:ProductOrServiceAxis","axis_label":"Product Lines","member":"cms:OtherUtilityServiceMember","member_label":"Other"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-346","char_anchor":"f-1436","text_snippet":"182","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-366","char_anchor":"f-1482","text_snippet":"158","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":182,"prior_value":158.0},{"tag":"us-gaap:ProvisionForDoubtfulAccounts","date_type":"Q","period_type":"duration","presentation_role":"revenuenarrativedetails","presentation_hierarchy":[{"role":"revenuenarrativedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","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":"Accounts Receivable, Credit Loss Expense (Reversal)","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-11","char_anchor":"f-1527","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-12","char_anchor":"f-1530","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":7.0},{"tag":"us-gaap:ProvisionForDoubtfulAccounts","date_type":"Q","period_type":"duration","presentation_role":"revenuenarrativedetails","presentation_hierarchy":[{"role":"revenuenarrativedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","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":"Accounts Receivable, Credit Loss Expense (Reversal)","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":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-92","char_anchor":"f-1528","text_snippet":"10","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-93","char_anchor":"f-1529","text_snippet":"7","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":10,"prior_value":7.0},{"tag":"us-gaap:ProvisionForDoubtfulAccounts","date_type":"YTD","period_type":"duration","presentation_role":"revenuenarrativedetails","presentation_hierarchy":[{"role":"revenuenarrativedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","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":"Accounts Receivable, Credit Loss Expense (Reversal)","current_period_value":30,"prior_period_value":24.0,"visual_current_value":30,"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-1532","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-13","char_anchor":"f-1533","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":24.0},{"tag":"us-gaap:ProvisionForDoubtfulAccounts","date_type":"YTD","period_type":"duration","presentation_role":"revenuenarrativedetails","presentation_hierarchy":[{"role":"revenuenarrativedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","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":"Accounts Receivable, Credit Loss Expense (Reversal)","current_period_value":30,"prior_period_value":24.0,"visual_current_value":30,"visual_prior_value":24.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-2","char_anchor":"f-1531","text_snippet":"30","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-94","char_anchor":"f-1534","text_snippet":"24","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":30,"prior_value":24.0},{"tag":"us-gaap:UnbilledReceivablesCurrent","date_type":"Q","period_type":"instant","presentation_role":"revenuenarrativedetails","presentation_hierarchy":[{"role":"revenuenarrativedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Unbilled Receivables, Current","current_period_value":381,"prior_period_value":391.0,"visual_current_value":381,"visual_prior_value":391.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"__NONE__","dimensions":null,"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-32","char_anchor":"f-1536","text_snippet":"381","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-38","char_anchor":"f-1517","text_snippet":"391","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":381,"prior_value":391.0},{"tag":"us-gaap:UnbilledReceivablesCurrent","date_type":"Q","period_type":"instant","presentation_role":"revenuenarrativedetails","presentation_hierarchy":[{"role":"revenuenarrativedetails","parent":"us-gaap:DisaggregationOfRevenueLineItems","order":2.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,2.0,1,2.0,1],"section_concept":null,"section_label":null}],"concept_label":"Unbilled Receivables, Current","current_period_value":381,"prior_period_value":391.0,"visual_current_value":381,"visual_prior_value":391.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"dei:LegalEntityAxis=cms:ConsumersEnergyCompanyMember","dimensions":[{"axis":"dei:LegalEntityAxis","axis_label":"Legal Entity","member":"cms:ConsumersEnergyCompanyMember","member_label":"Consumers Energy Company"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-105","char_anchor":"f-1537","text_snippet":"381","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-117","char_anchor":"f-1518","text_snippet":"391","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"millions","current_value":381,"prior_value":391.0},{"tag":"us-gaap:DebtInstrumentCarryingAmount","date_type":"Q","period_type":"instant","presentation_role":"variableinterestentitiesnarrativedetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":5.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,5.0,4],"section_concept":null,"section_label":null}],"concept_label":"Long-Term Debt, Gross","current_period_value":600,"prior_period_value":715.0,"visual_current_value":600,"visual_prior_value":715.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"us-gaap:LongtermDebtTypeAxis=cms:SecuritizationBondsMember","dimensions":[{"axis":"us-gaap:LongtermDebtTypeAxis","axis_label":"Long-Term Debt Type","member":"cms:SecuritizationBondsMember","member_label":"Securitization bonds"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-447","char_anchor":"f-2271","text_snippet":"600","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-399","char_anchor":"f-1659","text_snippet":"715","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":600,"prior_value":715.0},{"tag":"us-gaap:EquityMethodInvestments","date_type":"Q","period_type":"instant","presentation_role":"variableinterestentitiesnarrativedetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":6.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,6.0,5],"section_concept":null,"section_label":null}],"concept_label":"Equity Method Investments","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":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Not Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-453","char_anchor":"f-2279","text_snippet":"59","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"millions","current_value":59,"prior_value":null},{"tag":"cms:VariableInterestEntityMaximumCapacity","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Nameplate capacity (in MW)","current_period_value":525,"prior_period_value":525.0,"visual_current_value":525,"visual_prior_value":525.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:AviatorWindMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:AviatorWindMember","member_label":"Aviator Wind"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-443","char_anchor":"f-2238","text_snippet":"525","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-394","char_anchor":"f-1633","text_snippet":"525","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"units","current_value":525,"prior_value":525.0},{"tag":"cms:VariableInterestEntityMaximumCapacity","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":3.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,3.0,2],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Nameplate capacity (in MW)","current_period_value":180,"prior_period_value":null,"visual_current_value":180,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember|srt:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cms:NewportSolarHoldingsMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"},{"axis":"srt:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis","axis_label":"Schedule Of Equity Method Investment Equity Method Investee Name","member":"cms:NewportSolarHoldingsMember","member_label":"Newport Solar Holdings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-444","char_anchor":"f-2241","text_snippet":"180","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"units","current_value":180,"prior_value":null},{"tag":"us-gaap:VariableInterestEntityOwnershipPercentage","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage","current_period_value":50,"prior_period_value":50.0,"visual_current_value":50,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:CravenMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Not Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:CravenMember","member_label":"Craven"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-452","char_anchor":"f-2278","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-402","char_anchor":"f-1663","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":50,"prior_value":50.0},{"tag":"us-gaap:VariableInterestEntityOwnershipPercentage","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage","current_period_value":50,"prior_period_value":50.0,"visual_current_value":50,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:GeneseeMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Not Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:GeneseeMember","member_label":"Genesee"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-450","char_anchor":"f-2276","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-403","char_anchor":"f-1664","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":50,"prior_value":50.0},{"tag":"us-gaap:VariableInterestEntityOwnershipPercentage","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage","current_period_value":50,"prior_period_value":50.0,"visual_current_value":50,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:GraylingMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Not Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:GraylingMember","member_label":"Grayling"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-449","char_anchor":"f-2275","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-404","char_anchor":"f-1665","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":50,"prior_value":50.0},{"tag":"us-gaap:VariableInterestEntityOwnershipPercentage","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage","current_period_value":50,"prior_period_value":50.0,"visual_current_value":50,"visual_prior_value":50.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:TESFilerCityMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Not Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:TESFilerCityMember","member_label":"T.E.S. Filer City"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-451","char_anchor":"f-2277","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-401","char_anchor":"f-1662","text_snippet":"50","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":0,"scale":"hundredths","current_value":50,"prior_value":50.0},{"tag":"us-gaap:VariableInterestEntityOwnershipPercentage","date_type":"YTD","period_type":"duration","presentation_role":"variableinterestentitiesnarrativedetails|variableinterestentitiessummaryofvieinformationdetails","presentation_hierarchy":[{"role":"variableinterestentitiesnarrativedetails","parent":"us-gaap:VariableInterestEntityLineItems","order":1.0,"preferred_label_role":"terseLabel","global_sort_position":[0,1.0,0,5.0,4,1.0,0],"section_concept":null,"section_label":null},{"role":"variableinterestentitiessummaryofvieinformationdetails","parent":"us-gaap:VariableInterestEntityLineItems","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":"Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage","current_period_value":51,"prior_period_value":null,"visual_current_value":51,"visual_prior_value":null,"end_current":"2025-09-30","end_prior":null,"axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember|srt:OwnershipAxis=cms:AviatorWindEquityHoldingsMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"},{"axis":"srt:OwnershipAxis","axis_label":"Ownership","member":"cms:AviatorWindEquityHoldingsMember","member_label":"Aviator Wind Equity Holdings"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-442","char_anchor":"f-2237","text_snippet":"51","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":null},"collision_flag":1,"scale":"hundredths","current_value":51,"prior_value":null},{"tag":"us-gaap:Liabilities","date_type":"Q","period_type":"instant","presentation_role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","presentation_hierarchy":[{"role":"variableinterestentitiesscheduleofvariableinterestentitiesdetails","parent":"us-gaap:VariableInterestEntityLineItems","order":12.0,"preferred_label_role":"totalLabel","global_sort_position":[0,1.0,0,2.0,1,12.0,11],"section_concept":null,"section_label":null}],"concept_label":"Liabilities","current_period_value":72,"prior_period_value":64.0,"visual_current_value":72,"visual_prior_value":64.0,"end_current":"2025-09-30","end_prior":"2024-09-30","axis_key":"srt:ConsolidatedEntitiesAxis=us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","dimensions":[{"axis":"srt:ConsolidatedEntitiesAxis","axis_label":"Consolidated Entities","member":"us-gaap:VariableInterestEntityPrimaryBeneficiaryMember","member_label":"Variable Interest Entity Primary Beneficiary"}],"source":"xbrl","source_ref":{"type":"xbrl_context","current":{"context_ref":"c-445","char_anchor":"f-2266","text_snippet":"72","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"prior":{"context_ref":"c-397","char_anchor":"f-1655","text_snippet":"64","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115624000114/cms-20240930.htm","accession":"0000811156-24-000114"}},"collision_flag":1,"scale":"millions","current_value":72,"prior_value":64.0}],"producer_parser_version":"f588c127","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 (Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation). 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-230","text_snippet":"1,757","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"disclosure_signal":{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation","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":1757,"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":1757,"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-230","text_snippet":"1,757","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"}}],"evidence":{"reported_fact_source_ref":{"context_ref":"c-1","char_anchor":"f-230","text_snippet":"1,757","filing_url":"https://www.sec.gov/Archives/edgar/data/811156/000081115625000077/cms-20250930.htm","accession":"0000811156-25-000077"},"disclosure_signal":{"tag":"us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect","concept_label":"Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation","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":"CMS","period":"2025-Q3"}]}