Consumers Energy Company Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Accounts receivable and accrued revenue, allowance	$ 26	$ 27
Common stock authorized (in shares)		350,000,000.0
Common stock outstanding (in shares)	291,800,000	291,300,000
Preferred stock, par value (in dollars per share)	$ 4.50	$ 4.50
Consumers Energy Company
Accounts receivable and accrued revenue, allowance	$ 26	$ 27
Common stock authorized (in shares)		125,000,000.0
Common stock outstanding (in shares)		84,100,000
Preferred stock authorized (in shares)		7,500,000
Preferred stock outstanding (in shares)		400,000