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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share - CMS Energy [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 107 |  | $ 148 |  | $ 68 |  | $ 202 |  | $ 97 |  | $ 94 |  | $ 84 |  | $ 204 |  | $ 525 | $ 479 | $ 454
Less income attributable to noncontrolling interest | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 2 | 2 | 2
Net Income Available to Common Stockholders | $ 106 |  | $ 148 |  | $ 67 |  | $ 202 |  | $ 96 |  | $ 94 |  | $ 83 |  | $ 204 |  | $ 523 | $ 477 | $ 452
Weighted average shares - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 275.6 | 270.6 | 264.5
Add dilutive contingently convertible securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.1 | 6.4
Add dilutive non-vested stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 | 0.9 | 1.0
Weighted average shares - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 276.5 | 274.6 | 271.9
Basic | $ 0.39 | [1] | $ 0.53 | [1] | $ 0.25 | [1] | $ 0.73 | [1] | $ 0.35 | [1] | $ 0.34 | [1] | $ 0.31 | [1] | $ 0.77 | [1] | $ 1.90 | $ 1.76 | $ 1.71
Diluted | $ 0.38 | [1] | $ 0.53 | [1] | $ 0.25 | [1] | $ 0.73 | [1] | $ 0.35 | [1] | $ 0.34 | [1] | $ 0.30 | [1] | $ 0.75 | [1] | 1.89 | 1.74 | 1.66
Dividends declared per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.16 | $ 1.08 | $ 1.02
[1] | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.

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