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Earnings Per Share - CMS Energy (Basic And Diluted EPS Computations) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income available to common stockholders    
Income from continuing operations $ 263 $ 194
Loss attributable to noncontrolling interests (24) (10)
Preferred stock dividends 2 2
Income from continuing operations available to common stockholders – basic and diluted $ 285 $ 202
Average common shares outstanding    
Weighted average shares - basic (in shares) 296.5 290.7
Dilutive nonvested stock awards (in shares) 0.7 0.5
Weighted average shares - diluted (in shares) 297.2 291.2
Income from continuing operations per average common share available to common stockholders    
Basic (in dollars per share) $ 0.96 $ 0.69
Diluted (in dollars per share) $ 0.96 $ 0.69