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Earnings Per Share - CMS Energy - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2023
May 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Principal (In Millions) $ 2,410  
CMS Energy    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Principal (In Millions) 800  
CMS Energy | 3.375% Convertible Senior Notes Due 2028 | Convertible debt    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Principal (In Millions) $ 800 $ 800