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Quarterly Financial And Common Stock Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ 1,509 |  | $ 1,486 |  | $ 1,350 |  | $ 2,111 |  | $ 1,758 |  | $ 1,430 |  | $ 1,468 |  | $ 2,523 |  | $ 6,456 | $ 7,179 | $ 6,566
Operating Income (Loss) |  | 245 |  | 317 |  | 204 |  | 397 |  | 273 |  | 236 |  | 235 |  | 408 |  | 1,163 | 1,152 | 1,142
Net Income |  | 107 |  | 148 |  | 68 |  | 202 |  | 97 |  | 94 |  | 84 |  | 204 |  | 525 | 479 | 454
Income Attributable to Noncontrolling Interests |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 2 | 2 | 2
Net income (loss) attributable to CMS Energy |  | $ 106 |  | $ 148 |  | $ 67 |  | $ 202 |  | $ 96 |  | $ 94 |  | $ 83 |  | $ 204 |  | $ 523 | $ 477 | $ 452
Basic Earnings Per Average Common Share |  | $ 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 Earnings Per Average Common Share |  | $ 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
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (9) | $ (6) | $ (6)
Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 523 | 477 | 452
Net income (loss) attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 523 | 477 | 452
Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ 1,439 |  | $ 1,417 |  | $ 1,281 |  | $ 2,028 |  | $ 1,672 |  | $ 1,359 |  | $ 1,387 |  | $ 2,382 |  | 6,165 | 6,800 | 6,321
Operating Income (Loss) |  | 246 |  | 305 |  | 192 |  | 379 |  | 264 |  | 245 |  | 227 |  | 399 |  | 1,122 | 1,135 | 1,118
Net Income |  | 135 |  | 160 |  | 84 |  | 215 |  | 118 |  | 119 |  | 109 |  | 221 |  | 594 | 567 | 534
Preferred stock dividends |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 2 | 2 | 2
Net Income Available to Common Stockholders |  | $ 134 |  | $ 160 |  | $ 83 |  | $ 215 |  | $ 117 |  | $ 119 |  | $ 108 |  | $ 221 |  | $ 592 | $ 565 | $ 532
Maximum [Member] | CMS Energy Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | [2] | $ 37.17 |  | $ 35.82 |  | $ 35.57 |  | $ 38.20 |  | $ 36.42 |  | $ 30.87 |  | $ 31.15 |  | $ 29.28 |  | $ 37.17 | $ 36.42 |
Minimum [Member] | CMS Energy Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | [2] | $ 34.24 |  | $ 32.10 |  | $ 31.39 |  | $ 32.83 |  | $ 29.78 |  | $ 28.18 |  | $ 28.87 |  | $ 26.12 |  | $ 34.24 | $ 29.78 |
[1] | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.
[2] | Based on New York Stock Exchange composite transactions.

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