Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Jan. 31, 2025
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 1,790
Principal Debt Retirements (In Millions)	552
Consumers Energy Company
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	1,300
Principal Debt Retirements (In Millions)	302
First mortgage bonds \| 4.600% First Mortgage Bonds Due May 2029 \| Consumers Energy Company
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 600
Interest Rate (%)	4.60%
First mortgage bonds \| 4.700% First Mortgage Bonds Due January 2030 \| Consumers Energy Company
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 700
Interest Rate (%)	4.70%
First mortgage bonds \| 3.125% First Mortgage Bonds Due August 2024 \| Consumers Energy Company
Debt Instrument [Line Items]
Interest Rate (%)	3.125%
Principal Debt Retirements (In Millions)	$ 250
First mortgage bonds \| 3.190% First Mortgage Bonds Due 2024 \| Consumers Energy Company
Debt Instrument [Line Items]
Interest Rate (%)	3.19%
Principal Debt Retirements (In Millions)	$ 52
CMS Energy
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	490
Principal Debt Retirements (In Millions)	250
CMS Energy \| 5.245% Delayed Draw Unsecured Term Loan Credit Facility Due 2025 \| Subsequent Event
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)		$ 70
Interest Rate (%)		5.206%
CMS Energy \| Term loan facility \| 5.028% Delayed Draw Unsecured Term Loan Credit Facility Due 2025
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	400
CMS Energy \| Term loan facility \| 5.245% Delayed Draw Unsecured Term Loan Credit Facility Due 2025
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	90
Maximum borrowing capacity	$ 200
CMS Energy \| Senior notes \| 3.875% Senior Notes Due March 2024
Debt Instrument [Line Items]
Interest Rate (%)	3.875%
Principal Debt Retirements (In Millions)	$ 250

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