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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, 2019 | Mar. 31, 2018
Income available to common stockholders |  |
Net income | $ 213 | $ 241
Average common shares outstanding |  |
Weighted average shares - basic (in shares) | 282.8 | 281.5
Dilutive nonvested stock awards (in shares) | 0.6 | 0.7
Dilutive forward equity sale contracts (in shares) | 0.2 | 0.0
Weighted average shares - diluted (in shares) | 283.6 | 282.2
Net income per average common share available to common stockholders |  |
Basic earnings per average common share (in dollars per share) | $ 0.75 | $ 0.86
Diluted earnings per average common share (in dollars per share) | $ 0.75 | $ 0.86

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