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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income available to common stockholders |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 168 | $ 207 | $ 94 | $ 213 | $ 109 | $ 169 | $ 140 | $ 241 | $ 682 | $ 659 | $ 462
Income attributable to noncontrolling interests | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 2 | 2 | 2
Net Income Available to Common Stockholders | $ 167 | $ 207 | $ 93 | $ 213 | $ 108 | $ 169 | $ 139 | $ 241 | $ 680 | $ 657 | $ 460
Average common shares outstanding |  |  |  |  |  |  |  |  |  |  |
Weighted average shares - basic (in shares) |  |  |  |  |  |  |  |  | 283.0 | 282.2 | 280.0
Dilutive nonvested stock awards (in shares) |  |  |  |  |  |  |  |  | 0.7 | 0.7 | 0.8
Dilutive forward equity sale contracts |  |  |  |  |  |  |  |  | 0.6 | 0.0 | 0.0
Weighted average shares - diluted (in shares) |  |  |  |  |  |  |  |  | 284.3 | 282.9 | 280.8
Basic net income per average common share available to common stockholders (in dollars per share) | $ 0.59 | $ 0.73 | $ 0.33 | $ 0.75 | $ 0.38 | $ 0.60 | $ 0.49 | $ 0.86 | $ 2.40 | $ 2.33 | $ 1.64
Diluted net income per average common share available to common stockholders (in dollars per share) | $ 0.58 | $ 0.73 | $ 0.33 | $ 0.75 | $ 0.38 | $ 0.59 | $ 0.49 | $ 0.86 | $ 2.39 | $ 2.32 | $ 1.64

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