CMS Energy Corporation Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts receivable and accrued revenue, allowance	$ 20	$ 20
Common stock authorized (in shares)	350,000,000.0	350,000,000.0
Common stock outstanding (in shares)	290,100,000	289,800,000
Series C Preferred Stock Depositary Shares
Preferred stock authorized (in shares)	9,200,000	9,200,000
Preferred stock outstanding (in shares)	9,200,000	9,200,000