Financings and Capitalization (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Financing And Capitalization [Line Items]
Limitation on payment of stock dividends	$ 6,800,000,000
Dividends paid	287,000,000
Consumers Energy Company
Financing And Capitalization [Line Items]
Notes payable – related parties	0	$ 75,000,000
Unrestricted retained earnings	1,900,000,000
Consumers Energy Company | Credit Agreement
Financing And Capitalization [Line Items]
Maximum borrowing capacity		$ 500,000,000
Notes payable – related parties	0
Consumers Energy Company | Commercial Paper
Financing And Capitalization [Line Items]
Short-term debt authorized borrowings	500,000,000
Short-term borrowings outstanding	$ 0