Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Nonqualified deferred compensation plan assets Nonqualified deferred compensation plan assets fair value disclosure This element represents nonqualified deferred compensation plan assets measured at fair value on a recurring basis. The nonqualified deferred compensation plan assets consist of mutual funds, which are valued using quoted NAVs that are publicly available and are the basis for transactions to buy or sell shares in each fund. Trading Arrangement: Trading Arrangement [Axis] Amount of regulatory commitment assets Regulatory Commitment Estimated Amount Regulatory Commitment Estimated Amount Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] First mortgage bonds First Mortgage Bonds One [Member] First Mortgage Bonds [Member] Public utilities deferred information technology development costs Public Utilities, Deferred Information Technology Development Costs Public Utilities, Deferred Information Technology Development Costs Statistical Measurement [Domain] Statistical Measurement [Domain] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Carrying Amount Reported Value Measurement [Member] Document Fiscal Year Focus Document Fiscal Year Focus Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Segment Reporting [Abstract] Restructuring Plan [Axis] Restructuring Plan [Axis] Hart Township Hart Township [Member] Hart Township Common stock Common Stock, Value, Issued Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] State and local income taxes, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Retirement Benefits Retirement Benefits [Text Block] Credit Agreement Line of Credit [Member] Maximum Obligation Guarantor Obligations, Maximum Exposure, Undiscounted Restatement Determination Date Restatement Determination Date Investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Derivative Instrument [Axis] Derivative Instrument [Axis] TCJA excess deferred taxes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Amended requested annual rate increase Public Utilities, Requested Rate Increase (Decrease), Amended, Amount Regulatory liabilities Regulatory Liability, Noncurrent Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Current Liabilities Liabilities, Current [Abstract] Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Secured Revolving Credit Facility, Expiring November 2028 Secured Revolving Credit Facility, Expiring November 2028 [Member] Secured Revolving Credit Facility, Expiring November 2028 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Deferred property taxes Deferred property taxes Carrying amount as of the balance sheet date of accrued property taxes that will be recognized over future local taxing authorities fiscal periods expected to be within one year. Stockholder contribution Proceeds from Contributed Capital Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Estimate of shared costs Regulatory Asset, Estimate Of Shared Costs Regulatory Asset, Estimate Of Shared Costs Residential Residential Utility Services [Member] Residential Utility Services [Member] 2028 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Two Total common stockholders’ equity Common Stockholders’ Equity Common Stockholders’ Equity Total non‑current liabilities Liabilities, Noncurrent Regulatory asset collection period (in years) Regulatory Asset, Amortization Period Consolidated Entities [Domain] Consolidated Entities [Domain] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Regulatory Matters Public Utilities Disclosure [Text Block] DB Pension Plans Pension And D B S E R P [Member] Pension And DB SERP [Member] PEO Total Compensation Amount PEO Total Compensation Amount Assets Assets, Fair Value Disclosure [Abstract] Non‑current Liabilities Liabilities, Noncurrent [Abstract] 5.625% Junior Subordinated Notes Due 2078 5.625% Junior Subordinated Notes Due 2078 [Member] 5.625% Junior Subordinated Notes Due 2078 [Member] Weighted average shares - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Additions for prior-year tax positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Notional amount Derivative, Notional Amount Retirement Benefits [Abstract] Retirement Benefits [Abstract] Short-term debt authorized borrowings Short-term debt, authorized borrowings Maximum borrowing capacity under the commercial paper program without consideration of any current restrictions on the amount that could be issued or the amounts currently outstanding under the program. Equity interests Debt Instrument, Collateral Amount Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Regulatory assets Regulatory Asset, Noncurrent Construction financing agreement Construction Loans [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] CERCLA Liability Cercla Liability [Member] CERCLA Liability [Member] Number of reportable segments Number of Reportable Segments Secured Letter Of Credit Facility Secured Letter Of Credit Facility 2 [Member] Secured Letter Of Credit Facility 2 Total current liabilities Liabilities, Current Regulatory Liability [Axis] Regulatory Liability [Axis] Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] General taxes Taxes, Miscellaneous Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Other non‑current assets and liabilities Other non-current assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Entity Address, City or Town Entity Address, City or Town Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net Income (Loss) Available to Common Stockholders Net Income (Loss) Available to Common Stockholders, Basic Payment of dividends on common and preferred stock Payments of Ordinary Dividends Inventories at average cost Inventory, Net [Abstract] CMS Energy Corporation Depositary Shares, each representing a 1/1,000th interest in a share of 4.200% Cumulative Redeemable Perpetual Preferred Stock, Series C Series C Preferred Stock Depositary Shares Series C Preferred Stock Depositary Shares [Member] Series C Preferred Stock Depositary Shares Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Deferred credits (costs) Defined Benefit Plan, Deferred Credits (Costs) Defined Benefit Plan, Deferred Credits (Costs) Current portion of long-term debt and finance leases Long-Term Debt And Lease Obligation, Current, Excluding Notes Payable Long-Term Debt And Lease Obligation, Current, Excluding Notes Payable Amount of Facility Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other Comprehensive Income Other Comprehensive Income Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Current portion of long-term debt Long-Term Debt, Current Maturities CMS Energy Parent Company [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Class A - Tax Equity Membership Class A - Tax Equity Membership [Member] Class A - Tax Equity Membership Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Nonvested Stock Awards and Forward Equity Sale Contracts and Convertible Securities Earnings Per Share, Policy [Policy Text Block] New Accounting Standards Not Yet Effective New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Capital expenditures not paid Capital Expenditures Incurred but Not yet Paid Schedule of Financial Information by Reportable Segments Segment Reporting [Table Text Block] Noncontrolling Interests Noncontrolling Interest [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Consumers Utility Revenue Revenue from Contract with Customer [Policy Text Block] Common Stock Shares Issued Not Disclosed Common Stock Shares Issued Not Disclosed Common Stock Shares Issued Not Disclosed Plant, property, and equipment, gross Property, plant, and equipment, gross Public Utilities, Property Plant And Equipment And Finance Lease Right-Of-Use Asset, Before Accumulated Depreciation And Amortization And Construction Work In Progress Public Utilities, Property Plant And Equipment And Finance Lease Right-Of-Use Asset, Before Accumulated Depreciation And Amortization And Construction Work In Progress Other changes in noncontrolling interests Noncontrolling Interest, Increase (Decrease) From Other Changes Noncontrolling Interest, Increase (Decrease) From Other Changes Document Period End Date Document Period End Date Non‑cash transactions Non-Cash Transactions [Abstract] Non-cash transactions [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Principal Amount Debt Instrument, Face Amount Regulatory asset Regulatory Asset Security Exchange Name Security Exchange Name Stock offering program maximum value Stock Offering Program Maximum Value The maximum value of new stock which can be issued in a public offering. Debt instrument, term (in years) Debt Instrument, Term Financial Instruments [Line Items] Financial Instruments [Line Items] Financial Instruments [Line Items] Fair Value, Inputs, Level 1, 2 and 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Less accumulated depreciation and amortization Public Utilities, Property, Plant, and Equipment And Finance Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization Public Utilities, Property, Plant, and Equipment And Finance Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization Total liabilities Liabilities, Fair Value Disclosure Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Retention Benefits Retention Benefits [Member] Retention Benefits [Member] Consolidation Items [Domain] Consolidation Items [Domain] NWO Holdco NWO Holdco [Member] NWO Holdco NREPA Nrepa [Member] NREPA [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Share—CMS Energy Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] State deferred tax balances Deferred State and Local Income Tax Expense (Benefit) Document Fiscal Period Focus Document Fiscal Period Focus Leasing income Lease Income Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Non-consolidated VIEs Consolidation, Variable Interest Entity, Policy [Policy Text Block] Depreciation and amortization Depreciation and amortization Utilities Operating Expense, Depreciation and Amortization Capital expenditures (excludes assets placed under finance lease) Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Aviator Wind Equity Holdings Aviator Wind Equity Holdings [Member] Aviator Wind Class B Membership [Member] Purchased and interchange power Utilities Operating Expense, Purchased Power Additional annual rate increase authorized Public Utilities, Approved Rate Increase (Decrease), Amount Total operating expenses Utilities Operating Expense Company Selected Measure Name Company Selected Measure Name Dividends paid SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries Sale of Stock [Domain] Sale of Stock [Domain] Financial Instruments Fair Value of Financial Instruments and Investments in Debt and Equity Securities [Text Block] The entire disclosure of the fair value of financial instruments and investments in debt and equity securities. Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Notes receivable Financing Receivable, after Allowance for Credit Loss, Current Financial impact of emergency order Provisional Information, Emergency Order, Financial Impact Provisional Information, Emergency Order, Financial Impact Financing income Financing Income Financing income, including late payment fees from customers Public utility filing with the MPSC Public Utility Regulatory Filing, Service Restoration Cost Deferral Requested Amount Public Utility Regulatory Filing, Service Restoration Cost Deferral Requested Amount Retirement benefits liability Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Total principal amount outstanding Long-Term Debt, Gross Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Credit Facility [Domain] Credit Facility [Domain] Cash Flows from Operating Activities Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Guarantees And Other Contingencies [Table] Guarantees And Other Contingencies [Table] Guarantees And Other Contingencies [Table] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Public Utility [Axis] Public Utility [Axis] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Postretirement benefits Liability, Defined Benefit Plan, Noncurrent Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Defined Benefit Plan, Roll Forwards [Abstract] Defined Benefit Plan, Roll Forwards [Abstract] Borrowings Proceeds from Lines of Credit Deferred income taxes and investment tax credits Deferred income taxes and investment tax credits Deferred Income Taxes and Tax Credits Commercial Paper Commercial Paper [Member] Regulatory Asset [Axis] Regulatory Asset [Axis] Short-term borrowings outstanding Short-Term Debt Carrying Amount Guarantor Obligations, Current Carrying Value Derivative instruments Derivative Liability, Subject to Master Netting Arrangement, before Offset Unsecured Letter Of Credit Facility Unsecured Letter Of Credit Facility 3 [Member] Unsecured Letter Of Credit Facility 3 Delta Solar Equity Holdings Delta Solar Equity Holdings [Member] Delta Solar Equity Holdings Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Letters of Credit Outstanding Letters of Credit Outstanding, Amount Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Noncurrent Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Plant, property, and equipment, gross Property, Plant And Equipment Gross, Excluding C W I P Amount before accumulated depreciation, depletion and amortization and construction in progress of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Fair Value, Inputs, Level 1 Level 1 Fair Value, Inputs, Level 1 [Member] Other expense Other expense Other expense Other Nonoperating Expense Effective tax rate Effective Income Tax Rate Reconciliation, Percent Grayling Grayling [Member] Grayling [Member] Income (Loss) From Continuing Operations Income (Loss) From Continuing Operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest NorthStar Clean Energy NorthStar Clean Energy [Member] NorthStar Clean Energy All Executive Categories All Executive Categories [Member] Additional damages awarded Loss Contingency, Additional Damages Awarded, Value Loss Contingency, Additional Damages Awarded, Value Regulated Operations [Abstract] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Long-term debt Long-Term Debt, Fair Value MGP sites Manufactured Gas Plant [Member] Manufactured Gas Plant Payment of dividends on common and preferred stock Payments Of Ordinary Dividends, Common And Preferred Payments Of Ordinary Dividends, Common And Preferred Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Scenario [Domain] Scenario [Domain] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Consumers Energy Company Cumulative Preferred Stock, $100 par value: $4.50 Series Cumulative Preferred Stock [Member] Schedule of Basic and Diluted EPS Computations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reportable Segments Segment Reporting [Text Block] Schedule Of Financing And Capitalization [Line Items] Schedule Of Financing And Capitalization [Line Items] Schedule Of Financing And Capitalization [Line Items] Amount Borrowed Long-Term Line of Credit Minimum Minimum [Member] Notes receivable related party Notes Receivable, Related Parties, Fair Value Disclosure Notes Receivable, Related Parties, Fair Value Disclosure Expiration Date Trading Arrangement Expiration Date Bay Harbor Bay Harbor [Member] Bay Harbor Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Average common shares outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Unrestricted retained earnings Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval Total equity Total Equity at Beginning of Period Total Equity at End of Period Equity, Including Portion Attributable to Noncontrolling Interest Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Financial Instruments [Abstract] Financial Instruments [Abstract] FINANCIAL INSTRUMENTS [Abstract] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Nonrelated Party Nonrelated Party [Member] Retention benefit liability at beginning of period Retention benefit liability at the end of the period Other Liabilities Unbilled receivables Unbilled Receivables, Current Fair Value, Inputs, Level 2 And Level 3 Fair Value, Inputs, Level 2 And Level 3 [Member] Fair Value, Inputs, Level 2 And Level 3 New Accounting Standards New Accounting Pronouncements And Description Of New Accounting Pronouncements Not Yet Adopted [Text Block] The entire disclosure of the adoption of new accounting pronouncements that describes the new methods, amount and effects on financial statement line items, and the entire disclosure for a new accounting pronouncement that has been issued but not yet adopted. Remediation and other response activity costs Loss Contingency, Estimate of Possible Loss Requested annual rate increase Public Utilities, Requested Rate Increase (Decrease), Amount Net periodic credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Deferred investment tax credit Accumulated Deferred Investment Tax Credit Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Income (Expense) Other Income and Expenses [Abstract] Issuance of common stock Proceeds from Issuance of Common Stock Common stock authorized (in shares) Common Stock, Shares Authorized Accounts receivable and accrued revenue Accounts and notes receivable and accrued revenue Increase (Decrease) in Accounts and Other Receivables Shares subject to forward equity sale agreement (in shares) Sale of Stock, Number of Shares Issued in Transaction 2029 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Three Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Accounts receivable and accrued revenue, less allowance of $32 in 2026 and $27 in 2025 Accounts Receivable And Accrued Revenue, After Allowance For Credit Loss, Current Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current AND Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Power supply cost Power Supply Costs Power Supply Costs Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Interest Rate Swap Interest Rate Swap [Member] Property differences Effective Income Tax Rate Reconciliation, Property Differences, Percent Effective Income Tax Rate Reconciliation, Property Differences, Percent Financings and Capitalization Debt Disclosure [Text Block] T.E.S. Filer City T E S Filer City [Member] T.E.S. Filer City [Member] Scenario [Axis] Scenario [Axis] Service restoration cost deferral Service Restoration Cost Deferral Application [Member] Service Restoration Cost Deferral Application Retirement of debt Retirement of debt Payment for purchase of first mortgage bonds Repayments of Long-Term Debt Long-term receivables Receivables, Fair Value Disclosure NorthStar Clean Energy's Supplier Financing Program NorthStar Clean Energy's Supplier Financing Program [Member] NorthStar Clean Energy's Supplier Financing Program Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investments Equity Method Investments Volatility Mechanism Volatility Mechanism [Member] Volatility Mechanism Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Issuance of common stock Sale of Stock, Consideration Received on Transaction Total operating expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Site Contingency [Table] Site Contingency [Table] Unsecured Letter Of Credit Facility, Expiring September 2026 Unsecured Letter Of Credit Facility, Expiring September 2026 [Member] Unsecured Letter Of Credit Facility, Expiring September 2026 Debt instrument, interest rate, stated (in percent) Debt Instrument, Interest Rate, Stated Percentage Dividends declared on common stock Dividends declared on common stock Dividends, Common Stock, Cash Total stockholders’ equity Equity, Attributable to Parent Total other income Total other income Nonoperating Income (Expense) Restructuring Type [Axis] Restructuring Type [Axis] Accrual for environmental loss contingencies, inflation rate (in percent) Accrual for Environmental Loss Contingencies, Inflation Rate Accrual for Environmental Loss Contingencies, Inflation Rate Postretirement benefits Assets for Plan Benefits, Defined Benefit Plan ASSETS Assets [Abstract] Construction Financing Agreement, First Half Of 2026 Construction Financing Agreement, First Half Of 2026 [Member] Construction Financing Agreement, First Half Of 2026 Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Plant, property, and equipment, net Public Utilities Property Plant And Equipment Net Excluding C W I P Period end amount of total net PPE excluding construction work in progress. Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Deferred credits refund period (in years) Defined Benefit Plan, Deferred Credits, Refund Period Defined Benefit Plan, Deferred Credits, Refund Period Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Requested annual rate increase, as a percent Public Utilities, Requested Return on Equity, Percentage Unsecured Letter Of Credit Facility Unsecured Letter Of Credit Facility 1 [Member] Unsecured Letter Of Credit Facility 1 BG Solar Holdings BG Solar Holdings [Member] BG Solar Holdings Insider Trading Policies and Procedures [Line Items] Generating plant fuel stock Energy Related Inventory, Other Fossil Fuel Accounts receivable and accrued revenue, allowance Accounts Receivable, Allowance for Credit Loss, Current Other financing costs Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Damages awarded Loss Contingency, Damages Awarded, Value Schedule of Revolving Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] 2025 Electric Rate Case 2025 Electric Rate Case [Member] 2025 Electric Rate Case Regulatory assets Regulatory Asset, Current CMS Energy Note Payable CMS Energy Note Payable [Member] CMS Energy Note Payable [Member] Repayments of debt Repayments of Debt Number of former MGPs Number Of Former Manufactured Gas Plants Number Of Former Manufactured Gas Plants Type of Restructuring [Domain] Type of Restructuring [Domain] Public utilities operating and maintenance costs Public Utilities, Operating and Maintenance Costs Public Utilities, Operating and Maintenance Costs Purchased power – related parties Purchased Power Related Parties Cost of electricity purchased from related parties and sold during the reporting period. Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Construction work in progress Construction in Progress, Gross Entity Central Index Key Entity Central Index Key Financial Instruments [Table] Financial Instruments [Table] Financial Instruments [Table] Less accumulated depreciation and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Notes payable Notes Payable, Current Other paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Other Reconciling Items Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Current accounts receivable and notes receivable Accounts Receivable, Before Allowance For Credit Loss, And Notes Receivable, Current Accounts Receivable, Before Allowance For Credit Loss, And Notes Receivable, Current Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Duration of purchase agreement (in years) Facilities Sale Agreement, Purchase Agreement, Duration Facilities Sale Agreement, Purchase Agreement, Duration Unbilled Revenues Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block] Noncontrolling interest capacity (in MW) Maximum Project Capacity Maximum Project Capacity Indemnity obligations from stock and asset sale agreements Indemnification Agreement [Member] Common stockholders’ equity Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Unsecured Letter Of Credit Facility Unsecured Letter Of Credit Facility 2 [Member] Unsecured Letter Of Credit Facility 2 Dividends declared on preferred stock Dividends declared on preferred stock Dividends, Preferred Stock, Cash Restructuring Plan [Domain] Restructuring Plan [Domain] Total plant, property, and equipment Public Utilities, Property, Plant And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization Public Utilities, Property, Plant And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization Operating Expenses Operating Expenses [Abstract] Non-current portion of finance leases Finance Lease, Liability, Noncurrent Secured Revolving Credit Facility, Expiring May 2028 Secured Revolving Credit Facility, Expiring May 2028 [Member] Secured Revolving Credit Facility, Expiring May 2028 Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate (in percent) Debt Instrument, Basis Spread on Variable Rate Schedule Of Financing And Capitalization [Table] Schedule Of Financing And Capitalization [Table] Schedule Of Financing And Capitalization [Table] Allowance for borrowed funds used during construction Interest Costs Capitalized Adjustment City Area Code City Area Code Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] Gas in underground storage Energy Related Inventory, Gas Stored Underground All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Construction Financing Agreement, Second Half Of 2026 Construction Financing Agreement, Second Half Of 2026 [Member] Construction Financing Agreement, Second Half Of 2026 Regulatory Liability [Domain] Regulatory Liability [Domain] Secured Revolving Credit Facility, Expiring May 2029 Secured Revolving Credit Facility, Expiring May 2029 [Member] Secured Revolving Credit Facility, Expiring May 2029 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total Assets Total assets Assets Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Entity [Domain] Entity [Domain] NorthStar Clean Energy, Including Subsidiaries NorthStar Clean Energy, Including Subsidiaries [Member] NorthStar Clean Energy, Including Subsidiaries Craven Craven [Member] Craven [Member] Accrual for environmental loss contingencies Accrual for Environmental Loss Contingencies Amortization of net actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Operating Segments Operating Segments [Member] Total interest charges Total interest charges Interest Expense, Nonoperating Adjustment for sale of membership interests in VIEs Noncontrolling Interest, Increase from Sale of Parent Equity Interest PEO PEO [Member] Secured Letter Of Credit Facility Secured Letter Of Credit Facility 1 [Member] Secured Letter Of Credit Facility 1 Measurement Basis [Axis] Measurement Basis [Axis] Other non‑current liabilities Other Liabilities, Noncurrent Retirement Plan Type [Axis] Retirement Plan Type [Axis] NWO Wind Equity Holdings NWO Wind Equity Holdings [Member] NWO Wind Equity Holdings Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Unsecured Revolving Credit Facility, Expiring November 2030 Unsecured Revolving Credit Facility, Expiring November 2030 [Member] Unsecured Revolving Credit Facility, Expiring November 2030 Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Accrued taxes Taxes Payable, Current J.H. Campbell Generating Units J.H. Campbell Generating Units [Member] J.H. Campbell Generating Units Other Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Carrying Amounts and Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Diluted Earnings Per Average Common Share (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Settlement loss Defined Benefit Plan, Amortization Of Settlement Loss Defined Benefit Plan, Amortization Of Settlement Loss Variable lease income Operating Lease, Variable Lease Income Liabilities Liabilities, Fair Value Disclosure [Abstract] Litigation Case [Domain] Litigation Case [Domain] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Purchased power – related parties Utilities Operating Expense Purchased Power Related Parties Utilities Operating Expense Purchased Power Related Parties Ownership [Domain] Ownership [Domain] Maintenance and other operating expenses Utilities Operating Expense, Maintenance and Operations Plant, Property, and Equipment Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization [Abstract] Adjustments to reconcile net income to net cash provided by operating activities Adjustments to reconcile net income to net cash provided by operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Contingencies and Commitments Commitments Contingencies and Guarantees [Text Block] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Revenue recognized from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Industrial Industrial Utility Service [Member] Industrial Utility Service [Member] Total plant, property, and equipment Plant, property, and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Cash Flows from Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Amount Available Line of Credit Facility, Remaining Borrowing Capacity Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Interest cost Defined Benefit Plan, Interest Cost Ludington Plant Overhaul Contract Dispute Ludington Plant Overhaul Contract Dispute [Member] Ludington Plant Overhaul Contract Dispute Schedule of Retention Benefit Liability Roll Forward Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Common stock repurchased Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive Loss Attributable to Noncontrolling Interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Fair Value Estimate of Fair Value Measurement [Member] Revenue Revenue from Contract with Customer [Text Block] Common stock issued Stock Issued During Period, Value, New Issues Supplier financing program, payment period (in days) Supplier Finance Program, Payment Timing, Period Cumulative Redeemable Perpetual Preferred Stock, Series C Cumulative Preferred Stock Preferred Stock [Member] Cost to retire property and other investing activities Cost to retire property and other investing activities Payment for (Proceeds from) Other Investing Activity Inventories Inventories Increase (Decrease) in Inventories Segment Reporting [Table] Segment Reporting [Table] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Sale of Stock [Axis] Sale of Stock [Axis] Prepayments and other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating Income Operating Income (Loss) Current Fiscal Year-End Date Current Fiscal Year End Date Alternative-revenue programs Alternative Revenue Programs Alternative Revenue Programs Limitation on payment of stock dividends Amount Available For Dividend Distribution The amount of dividends that may be paid or declared in any calendar year, limited by statutory restriction. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Long-term payables Notes Payable, Fair Value Disclosure Expected cost Restructuring and Related Cost, Expected Cost Facilities agreed to sell Facilities Sale Agreement, Number Of Facilities Agreed To Sell Facilities Sale Agreement, Number Of Facilities Agreed To Sell Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Decrease in notes payable Decrease in notes payable Proceeds from (Repayments of) Short-Term Debt Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Dividends declared per preferred stock Series C depositary share (in dollars per share) Preferred Stock, Dividends Per Share, Declared Measure: Measure [Axis] Schedule of VIE Information and Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Schedule of Guarantees Schedule of Guarantor Obligations [Table Text Block] AROs Asset Retirement Obligations, Noncurrent Debt instrument, increase (decrease), net Debt Instrument, Increase (Decrease), Net Equity Components [Axis] Equity Components [Axis] Maintenance and other operating expenses Other Cost and Expense, Operating Related Party Related Party [Member] Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Materials and supplies Other Inventory, Supplies, Gross Loss Attributable to Noncontrolling Interests Less loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Supplier Finance Program [Domain] Supplier Finance Program [Domain] Entity Small Business Entity Small Business Comprehensive Income Attributable to CMS Energy Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Utility Plant [Domain] Utility Plant [Domain] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Income tax expense at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Ordered rate amendment Public Utilities, Ordered Rate Increase (Decrease), Amended, Amount Public Utilities, Ordered Rate Increase (Decrease), Amended, Amount Other Other non-current assets Other Assets, Noncurrent Term Loan Term Loan 2 [Member] Term Loan 2 Document Type Document Type Amortization of: Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Plant, property, and equipment, net Property, Plant And Equipment, Net, Excluding C W I P Amount before construction in progress but after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Taxes attributable to noncontrolling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Site Contingency [Line Items] Site Contingency [Line Items] 2027 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year One Initial forward price (in dollars per share) Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Gas Utility Gas Utility [Member] Gas Utility [Member] Dilutive nonvested stock awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Proceeds from issuance of debt Proceeds from issuance of debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number OPEB Plan Other Postretirement Benefits Plan [Member] Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income (Loss) Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Supplier Finance Program [Axis] Supplier Finance Program [Axis] Interest expense – related parties Interest Expense, Other Commitments and Contingencies (Notes 2, 3, and 8) Commitments and Contingencies Amortization of net actuarial loss, tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Genesee Genesee [Member] Genesee [Member] Operating Revenue Total operating revenue Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Accounts payable and accrued rate refunds Accounts payable and accrued rate refunds Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Costs deferred as a regulatory asset Restructuring and Related Cost, Deferred Cost Restructuring and Related Cost, Deferred Cost Settlement Of Forward Contracts Settlement Of Forward Contracts [Member] Settlement Of Forward Contracts Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Proceeds from the sale of membership interests in VIEs Proceeds from Sale of Interest in Partnership Unit Executive Category: Executive Category [Axis] Aviator Wind Aviator Wind [Member] Aviator Wind [Member] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Supplier finance obligations Supplier Finance Program, Obligation All Award Types Award Type [Domain] Securitization bonds Securitization Bonds [Member] Securitization Bonds [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Level 3 Fair Value, Inputs, Level 3 [Member] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Non‑cash transactions Supplemental Cash Flow Information [Abstract] Cost of gas sold Utilities Operating Expense, Gas and Petroleum Purchased Ownership (in percent) Subsidiary, Ownership Percentage, Noncontrolling Owner PEO Name PEO Name Current portion of long-term payables Other Short-Term Borrowings Nameplate capacity (in MW) Variable Interest Entity, Maximum Capacity Variable Interest Entity, Maximum Capacity Other segment items Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Other interest expense Interest Expense, Other, Including Adjustments For Capitalized Interest Expense Interest Expense, Other, Including Adjustments For Capitalized Interest Expense Entity Tax Identification Number Entity Tax Identification Number Purchased and interchange power Electricity, Purchased [Member] Legal Entity [Axis] Legal Entity [Axis] Interest on long-term debt Interest Expense, Debt Other Commitments [Line Items] Other Commitments [Line Items] Supplier financing program, termination period (in days) Supplier Finance Program, Termination Period Supplier Finance Program, Termination Period Accounts receivable Accounts and notes receivable – related parties Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period Cash and Cash Equivalents, Including Restricted Amounts, End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Preferred Stock Dividends Preferred Stock Dividends Preferred Stock Dividends, Income Statement Impact 2030 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Four Deemed contribution from sale of membership interest Deemed Contribution, Sale Of Membership Interest Deemed Contribution, Sale Of Membership Interest Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Electric Utility Electric Utility [Member] Electric Utility [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash and cash equivalents Restricted cash equivalents Restricted Cash and Cash Equivalent, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Non-operating retirement benefits, net Non-operating retirement benefits, net Other Nonoperating Income (Expense), Retirement Benefits, Net The total amount of other cost components excluding the service cost component of net benefit cost for defined benefit plans for the period. Other cost components include the following components: Interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlement or curtailments. The other cost components are presented separately outside of operating income on the statement of income. General taxes Utilities Operating Expense, Taxes Interest Charges Interest Expense, Operating and Nonoperating [Abstract] Term Loan Term Loan 1 [Member] Term Loan 1 Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Accounts Receivable and Unbilled Revenues Credit Loss, Financial Instrument [Policy Text Block] Schedule of Major Long-Term Debt Issuances and Retirements Schedule of Debt [Table Text Block] Total other non‑current assets Assets, Noncurrent, Other than Property, Plant and Equipment Assets, Noncurrent, Other than Property, Plant and Equipment Accrued interest Interest and Dividends Payable, Current Investment, Name [Domain] Investment, Name [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic Earnings Per Average Common Share (in dollars per share) Earnings Per Share, Basic Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Cost of gas sold Oil and Gas, Purchased [Member] Long-term debt Long-Term Debt, Excluding Current Maturities Discount rate (in percent) Accrual for Environmental Loss Contingencies, Discount Rate 5.875% Junior Subordinated Notes Due 2079 5.875% Junior Subordinated Notes Due 2079 [Member] 5.875% Junior Subordinated Notes Due 2079 [Member] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable – related parties Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Retirement Benefits Liability Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] DB Pension Plans Pension Plan [Member] CMS Energy Corporation Common Stock, $0.01 par value Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Fuel for electric generation Utilities Operating Expense, Fuel Used St. Clair County St. Clair County [Member] St. Clair County Nontaxable or nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] HL Solar Holdings HL Solar Holdings [Member] HL Solar Holdings Cover page. Cover [Abstract] Secured Letter Of Credit Facility, Expiring September 2028 Secured Letter Of Credit Facility, Expiring September 2028 [Member] Secured Letter Of Credit Facility, Expiring September 2028 Commercial Commercial Utility Service [Member] Commercial Utility Service [Member] Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Derivative Contract [Domain] Derivative Contract [Domain] Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] Surcharge for the recovery of excess distribution investments Public Utilities, Surcharge For Recovery Of Excess Distribution Investments Public Utilities, Surcharge For Recovery Of Excess Distribution Investments Total Liabilities and Equity Liabilities and Equity Regulatory Asset [Domain] Regulatory Asset [Domain] 5.875% Junior Subordinated Notes Due 2078 5.875% Junior Subordinated Notes Due 2078 [Member] 5.875% Junior Subordinated Notes Due 2078 [Member] Renewable energy tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Percent Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Accrued rate refunds Accrued Rate Refunds Current liabilities that represent obligations to make refunds to customers for fuel costs. Construction work in progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Nonqualified deferred compensation plan liabilities Nonqualified Deferred Compensation Plan Liabilities Fair Value Disclosure This element represents nonqualified deferred compensation plan liabilities measured at fair value on a recurring basis. The liabilities are based on the fair values of the plan assets, as they reflect what is owed to the plan participants in accordance with their investment elections. Guarantees And Other Contingencies [Line Items] Guarantees And Other Contingencies [Line Items] Guarantees And Other Contingencies [Line Items] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Amortization of prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Stockholder contribution Adjustments to Additional Paid in Capital Stockholder Contribution Adjustments to Additional Paid in Capital Stockholder Contribution Dilutive contingently convertible securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Accrual for environmental loss contingencies, gross Accrual for Environmental Loss Contingencies, Gross Costs paid or settled Restructuring And Related Cost, Costs Paid Or Settled Restructuring And Related Cost, Costs Paid Or Settled Settlement of forward contracts through issuance of stock (in dollars per share) Sale of Stock, Price Per Share Income from continuing operations per average common share available to common stockholders Earnings Per Share, Basic and Diluted EPS [Abstract] Earnings Per Share, Basic and Diluted EPS Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Less preferred stock dividends Preferred Stock Dividends and Other Adjustments Cumulative redeemable perpetual preferred stock Cumulative preferred stock Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Exit Activities and Asset Sales Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other non‑cash operating activities and reconciling adjustments Other non‑cash operating activities and reconciling adjustments Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Retirement Plan Type [Domain] Other Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Secured Revolving Credit Facility, Expiring November 2030 Secured Revolving Credit Facility, Expiring November 2030 [Member] Secured Revolving Credit Facility, Expiring November 2030 Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Changes in assets and liabilities Increase (Decrease) in Receivables [Abstract] Name Trading Arrangement, Individual Name Indemnity obligations from sale of membership interests in VIEs Indemnification Agreement From Sale of Membership Interests in VIEs [Member] Indemnification Agreement From Sale of Membership Interests in VIEs Cash and cash equivalents Cash and Cash Equivalent Consumers Energy Company Consumers Energy Company [Member] Consumers Energy Company Schedule of Remediation and Other Response Activity Costs by Year Expected Remediation Costs By Year [Table Text Block] Expected Remediation Costs By Year Ownership interest (in percent) Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Company Selected Measure Amount Company Selected Measure Amount Shares contracted under forward sale agreements (in shares) Forward Contract Indexed to Issuer's Equity, Indexed Shares Depreciation and amortization Depreciation, Depletion and Amortization Unsecured Letter Of Credit Facility, Expiring March 2028 Unsecured Letter Of Credit Facility, Expiring March 2028 [Member] Unsecured Letter Of Credit Facility, Expiring March 2028 Net Income Net Income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 2026 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Remainder of Fiscal Year Current Assets Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income tax expense (benefit) Income Tax Expense (Benefit) Other income Other income Other Nonoperating Income Cost of goods and services sold Cost of gas sold Cost of Product and Service Sold Other Non‑current Assets Regulated Entity, Other Assets, Noncurrent [Abstract] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Accounts and notes receivable – related parties Accounts and Financing Receivable, after Allowance for Credit Loss, Current Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Other Other Utility Service [Member] Other Utility Service [Member] Secured Letter Of Credit Facility, Expiring May 2027 Secured Letter Of Credit Facility, Expiring May 2027 [Member] Secured Letter Of Credit Facility, Expiring May 2027 Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Class B Membership Class B Membership [Member] Class B Membership Net loss Defined Benefit Plan, Amortization of Gain (Loss) Fuel for electric generation Fuel Costs Net Income Net Income Net Income Net Income (Loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Rate of return on equity authorized Public Utilities, Approved Return on Equity, Percentage Restatement Determination Date: Restatement Determination Date [Axis] Newport Solar Holdings Newport Solar Holdings [Member] Newport Solar Holdings Regulatory liabilities Regulatory Liability, Current Debt conversion, converted instrument, amount Debt Conversion, Converted Instrument, Amount 2031 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Five Income from continuing operations available to common stockholders – basic and diluted Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Derivative instruments Derivative Asset, Subject to Master Netting Arrangement, before Offset Other current assets and liabilities Other current assets and liabilities Increase (Decrease) in Other Current Assets and Liabilities, Net Guarantees Guarantee Type, Other [Member] Damages sought Loss Contingency, Damages Sought, Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Income available to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]