Consumers Energy Company Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts receivable and accrued revenue, allowance	$ 21	$ 27
Common stock authorized (in shares)	350,000,000.0	350,000,000.0
Common stock outstanding (in shares)	294,400,000	291,300,000
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock authorized (in shares)	10,000,000
Consumers Energy Company
Accounts receivable and accrued revenue, allowance	$ 21	$ 27
Common stock authorized (in shares)	125,000,000.0	125,000,000.0
Common stock outstanding (in shares)	84,100,000	84,100,000
Preferred stock, par value (in dollars per share)	$ 4.50	$ 4.50
Preferred stock authorized (in shares)	7,500,000	7,500,000
Preferred stock outstanding (in shares)	400,000	400,000