Consumers Energy Company Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable and accrued revenue, allowance	$ 23	$ 21
Common stock authorized (in shares)	350,000,000.0	350,000,000.0
Common stock outstanding (in shares)	298,600,000	294,400,000
Consumers Energy Company
Accounts receivable and accrued revenue, allowance	$ 23	$ 21
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