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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income available to common stockholders |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 109 | $ 169 | $ 140 | $ 241 | $ (2) | $ 172 | $ 93 | $ 199 | $ 659 | $ 462 | $ 553
Income attributable to noncontrolling interests | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 2 | 2 | 2
Net Income Available to Common Stockholders | $ 108 | $ 169 | $ 139 | $ 241 | $ (3) | $ 172 | $ 92 | $ 199 | $ 657 | $ 460 | $ 551
Average common shares outstanding |  |  |  |  |  |  |  |  |  |  |
Weighted average shares - basic (in shares) |  |  |  |  |  |  |  |  | 282.2 | 280.0 | 277.9
Dilutive nonvested stock awards (in shares) |  |  |  |  |  |  |  |  | 0.7 | 0.8 | 1.0
Weighted average shares - diluted (in shares) |  |  |  |  |  |  |  |  | 282.9 | 280.8 | 278.9
Basic net income per average common share available to common stockholders (in dollars per share) | $ 0.38 | $ 0.60 | $ 0.49 | $ 0.86 | $ (0.01) | $ 0.61 | $ 0.33 | $ 0.71 | $ 2.33 | $ 1.64 | $ 1.99
Diluted net income per average common share available to common stockholders (in dollars per share) | $ 0.38 | $ 0.59 | $ 0.49 | $ 0.86 | $ (0.01) | $ 0.61 | $ 0.33 | $ 0.71 | $ 2.32 | $ 1.64 | $ 1.98

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