CMS Energy Corporation Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 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)	298,800,000	294,400,000
Preferred stock authorized (in shares)	10,000,000
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