CMS Energy Corporation Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable and accrued revenue, allowance	$ 23	$ 21
Common stock authorized (in shares)	350.0	350.0
Common stock outstanding (in shares)	298.6	294.4
Series C Preferred Stock Depositary Shares
Preferred stock authorized (in shares)		9.2
Preferred stock outstanding (in shares)		9.2