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Schedule 1 - Condensed Financial Information of Registrant (Condensed Statements of Income - Parenthetical) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Income Statements, Captions [Line Items]      
Tax effect of discontinued operations $ 0 $ 1 $ 170
CMS Energy      
Condensed Income Statements, Captions [Line Items]      
Tax effect of discontinued operations $ 0 $ 0 $ (5)