Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) - Consumers Energy Company $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Principal (In Millions)	$ 600
Repayments of debt	250
First mortgage bonds | 4.600% First Mortgage Bonds Due March 2028
Debt Instrument [Line Items]
Principal (In Millions)	$ 600
Interest rate	4.60%
Senior notes | Senior Notes Due March 2024
Debt Instrument [Line Items]
Interest rate	3.875%
Repayments of debt	$ 250