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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income available to common stockholders |  |  |  |
Net income | $ 140 | $ 93 | $ 381 | $ 292
Income Attributable to Noncontrolling Interests | 1 | 1 | 1 | 1
Net Income Available to Common Stockholders | $ 139 | $ 92 | $ 380 | $ 291
Average common shares outstanding |  |  |  |
Weighted average shares - basic (in shares) | 282.1 | 279.5 | 281.8 | 279.2
Dilutive nonvested stock awards (in shares) | 0.5 | 0.8 | 0.6 | 0.9
Weighted average shares - diluted (in shares) | 282.6 | 280.3 | 282.4 | 280.1
Net income per average common share available to common stockholders |  |  |  |
Basic earnings per average common share (in dollars per share) | $ 0.49 | $ 0.33 | $ 1.35 | $ 1.04
Diluted earnings per average common share (in dollars per share) | $ 0.49 | $ 0.33 | $ 1.35 | $ 1.04

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