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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
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Earnings Per Share - CMS Energy [Abstract] |  |  |  |
Net Income | $ 93 | $ 125 | $ 292 | $ 289
Less income attributable to noncontrolling interest | 1 | 1 | 1 | 1
Net Income Available to Common Stockholders | $ 92 | $ 124 | $ 291 | $ 288
Weighted average shares - basic | 279.5 | 278.2 | 279.2 | 277.4
Add dilutive nonvested stock awards | 0.8 | 1.1 | 0.9 | 1.2
Weighted average shares - diluted | 280.3 | 279.3 | 280.1 | 278.6
Basic | $ 0.33 | $ 0.45 | $ 1.04 | $ 1.04
Diluted | $ 0.33 | $ 0.45 | $ 1.04 | $ 1.04

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