CMS Energy Corporation Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Accounts receivable and accrued revenue, allowance	$ 27	$ 27
Common stock authorized (in shares)	350,000,000.0	350,000,000.0
Common stock outstanding (in shares)	291,700,000	291,300,000
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