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Financings and Capitalization (Retirements of Debt) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2024	Dec. 31, 2023
Consumers Energy Company
Debt Instrument [Line Items]
Repayments of debt		$ 1,625
Term Loan Facility Due 2024 \| Term loan facility \| Consumers Energy Company
Debt Instrument [Line Items]
Repayments of debt		1,000
0.350% First Mortgage Bonds Due June 2023 \| First mortgage bonds \| Consumers Energy Company
Debt Instrument [Line Items]
Repayments of debt		$ 300
Interest rate		0.35%
3.375% First Mortgage Bonds Due August 2023 \| First mortgage bonds \| Consumers Energy Company
Debt Instrument [Line Items]
Repayments of debt		$ 325
Interest rate		3.375%
NorthStar Clean Energy, Including Subsidiaries
Debt Instrument [Line Items]
Repayments of debt		$ 185
NorthStar Clean Energy, Including Subsidiaries \| Term Loan Facility Due October 2025 \| Term loan facility
Debt Instrument [Line Items]
Repayments of debt		$ 185
CMS Energy \| Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 250
Interest rate	3.875%