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Quarterly Financial and Common Stock Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Revenue | $ 1,670 | $ 1,507 | $ 1,333 | $ 1,743 | $ 1,620 |  | $ 1,464 |  | $ 1,364 |  | $ 2,055 |  | $ 6,253 |  | $ 6,503 |  | $ 6,432 |
Operating Income (Loss) | 212 | 343 | 260 | 188 | 174 |  | 316 |  | 207 |  | 306 |  | 1,003 |  | 1,003 |  | 978 |
Income From Continuing Operations | 67 | 149 | 101 | 60 | 41 |  | 140 |  | 101 |  | 133 |  | 377 |  | 415 |  | 366 |
Income (Loss) From Discontinued Operations |  |  |  | 7 |  |  |  |  |  |  | 2 |  | 7 | [1] | 2 | [2] | (23) | [3]
Net Income | 67 | 149 | 101 | 67 | 41 |  | 140 |  | 101 |  | 135 |  | 384 |  | 417 |  | 343 |
Income Attributable to Noncontrolling Interests |  | 1 | 1 |  |  |  | 1 |  | 1 |  |  |  | 2 |  | 2 |  | 3 |
Net Income Attributable to CMS Energy | 67 | 148 | 100 | 67 | 41 |  | 139 |  | 100 |  | 135 |  | 382 |  | 415 |  | 340 |
Net Income Available to Common Stockholders | 67 | 148 | 100 | 67 | 41 |  | 139 |  | 100 |  | 135 |  | 382 |  | 415 |  | 324 |
Earnings from continuing operations per average common share - basic | $ 0.26 | $ 0.56 | $ 0.38 | $ 0.23 | $ 0.16 | [4] | $ 0.55 | [4] | $ 0.40 | [4] | $ 0.53 | [4] | $ 1.43 |  | $ 1.65 |  | $ 1.50 |
Earnings from continuing operations per average common share - diluted | $ 0.25 | $ 0.55 | $ 0.37 | $ 0.22 | $ 0.15 | [4] | $ 0.53 | [4] | $ 0.38 | [4] | $ 0.51 | [4] | $ 1.39 |  | $ 1.57 |  | $ 1.36 |
Basic earnings per average common share | $ 0.26 | $ 0.56 | $ 0.38 | $ 0.26 | $ 0.16 | [4] | $ 0.55 | [4] | $ 0.40 | [4] | $ 0.54 | [4] | $ 1.46 |  | $ 1.66 |  | $ 1.40 |
Diluted earnings per average common share | $ 0.25 | $ 0.55 | $ 0.37 | $ 0.25 | $ 0.15 | [4] | $ 0.53 | [4] | $ 0.38 | [4] | $ 0.52 | [4] | $ 1.42 |  | $ 1.58 |  | $ 1.28 |
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | (8) |  | (3) |  | (6) |
Income From Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  | 382 |  | 415 |  | 350 |
Income (Loss) From Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) |
Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 382 |  | 415 |  | 340 |
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 382 |  | 415 |  | 324 |
Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 1,608 | 1,448 | 1,282 | 1,675 | 1,565 |  | 1,397 |  | 1,303 |  | 1,988 |  | 6,013 |  | 6,253 |  | 6,156 |
Operating Income (Loss) | 207 | 334 | 260 | 183 | 173 |  | 305 |  | 207 |  | 300 |  | 984 |  | 985 |  | 926 |
Net Income | 78 | 163 | 122 | 76 | 67 |  | 155 |  | 92 |  | 153 |  | 439 |  | 467 |  | 434 |
Preferred Stock Dividends |  | 1 | 1 |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |
Net Income Available to Common Stockholders | $ 78 | $ 162 | $ 121 | $ 76 | $ 67 |  | $ 154 |  | $ 91 |  | $ 153 |  | $ 437 |  | $ 465 |  | $ 432 |
Maximum [Member] | CMS Energy Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 24.70 | $ 24.81 | $ 23.87 | $ 22.31 | $ 22.35 |  | $ 20.47 |  | $ 20.39 |  | $ 19.78 |  | $ 24.70 |  | $ 22.35 |  |  |
Minimum [Member] | CMS Energy Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 22.79 | $ 22.70 | $ 21.52 | $ 21.33 | $ 19.18 |  | $ 17.16 |  | $ 18.90 |  | $ 18.60 |  | $ 22.79 |  | $ 19.18 |  |  |
[1] | Includes an $11 million ($7 million net of tax) reversal of a loss on disposal due to the elimination of a liability associated with the 2003 sale of Panhandle.
[2] | Includes an operating gain of $3 million related to a litigation settlement at CMS Viron.
[3] | Includes an operating loss of $2 million ($1 million net of tax) at Exeter, whose assets and liabilities were reclassified as held for sale in 2009.
[4] | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.

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