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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
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share - CMS Energy [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 78 |  | $ 186 |  | $ 125 |  | $ 164 |  | $ 107 |  | $ 148 |  | $ 68 |  | $ 202 |  | $ 553 | $ 525 | $ 479
Less income attributable to noncontrolling interest | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 2 | 2 | 2
Net Income Available to Common Stockholders | $ 77 |  | $ 186 |  | $ 124 |  | $ 164 |  | $ 106 |  | $ 148 |  | $ 67 |  | $ 202 |  | $ 551 | $ 523 | $ 477
Weighted average shares - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 277.9 | 275.6 | 270.6
Add dilutive contingently convertible securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.1
Add dilutive non-vested stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 | 0.9 | 0.9
Weighted average shares - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 278.9 | 276.5 | 274.6
Basic | $ 0.28 | [1] | $ 0.67 | [1] | $ 0.45 | [1] | $ 0.59 | [1] | $ 0.39 | [1] | $ 0.53 | [1] | $ 0.25 | [1] | $ 0.73 | [1] | $ 1.99 | $ 1.90 | $ 1.76
Diluted | $ 0.28 | [1] | $ 0.67 | [1] | $ 0.45 | [1] | $ 0.59 | [1] | $ 0.38 | [1] | $ 0.53 | [1] | $ 0.25 | [1] | $ 0.73 | [1] | 1.98 | 1.89 | 1.74
Dividends Declared Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.16 | $ 1.08
[1] | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.

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