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Quarterly Financial and Common Stock Information (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Operating Revenue | $ 1,620 |  | $ 1,464 |  | $ 1,364 |  | $ 2,055 |  | $ 1,682 |  | $ 1,443 |  | $ 1,340 |  | $ 1,967 |  | $ 6,503 |  | $ 6,432 |  | $ 6,205 |
Operating Income | 174 |  | 316 |  | 207 |  | 306 |  | 158 |  | 319 |  | 262 |  | 239 |  | 1,003 |  | 978 |  | 698 |
Income from Continuing Operations | 41 |  | 140 |  | 101 |  | 133 |  | 31 |  | 146 |  | 100 |  | 89 |  | 415 |  | 366 |  | 220 |
Income (Loss) From Discontinued Operations, Net of Tax |  |  |  |  |  |  | 2 |  | (6) |  |  |  | (16) |  | (1) |  | 2 | [1] | (23) | [2] | 20 | [3]
Net Income | 41 |  | 140 |  | 101 |  | 135 |  | 25 |  | 146 |  | 84 |  | 88 |  | 417 |  | 343 |  | 240 |
Income attributable to noncontrolling interests |  |  | 1 |  | 1 |  |  |  |  |  | 1 |  | 2 |  |  |  | 2 |  | 3 |  | 11 |
Net Income Attributable to CMS Energy | 41 |  | 139 |  | 100 |  | 135 |  | 25 |  | 145 |  | 82 |  | 88 |  | 415 |  | 340 |  | 229 |
Charge for Deferred Issuance Costs on Preferred Stock |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  | 0 |  | 8 |  | 0 |
Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  | 3 |  | 2 |  | 3 |  | 0 |  | 8 |  | 11 |
Net Income Available to Common Stockholders | 41 |  | 139 |  | 100 |  | 135 |  | 25 |  | 134 |  | 80 |  | 85 |  | 415 |  | 324 |  | 218 |
Earnings from continuing operations per average common share - basic | $ 0.16 |  | $ 0.55 |  | $ 0.40 |  | $ 0.53 |  | $ 0.13 | [4] | $ 0.58 | [4] | $ 0.42 | [4] | $ 0.38 | [4] | $ 1.65 |  | $ 1.50 |  | $ 0.87 |
Earnings from continuing operations per average common share - diluted | $ 0.15 |  | $ 0.53 |  | $ 0.38 |  | $ 0.51 |  | $ 0.11 | [4] | $ 0.53 | [4] | $ 0.39 | [4] | $ 0.35 | [4] | $ 1.57 |  | $ 1.36 |  | $ 0.83 |
Basic earnings per average common share | $ 0.16 | [4] | $ 0.55 | [4] | $ 0.40 | [4] | $ 0.54 | [4] | $ 0.11 | [4] | $ 0.58 | [4] | $ 0.35 | [4] | $ 0.37 | [4] | $ 1.66 |  | $ 1.40 |  | $ 0.96 |
Diluted earnings per average common share | $ 0.15 | [4] | $ 0.53 | [4] | $ 0.38 | [4] | $ 0.52 | [4] | $ 0.09 | [4] | $ 0.53 | [4] | $ 0.32 | [4] | $ 0.34 | [4] | $ 1.58 |  | $ 1.28 |  | $ 0.91 |
CMS Energy Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  | (6) |  | (10) |
Income from Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 415 |  | 350 |  | 229 |
Income (Loss) From Discontinued Operations, Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 415 |  | 340 |  | 229 |
Charge for Deferred Issuance Costs on Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 11 |
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 415 |  | 324 |  | 218 |
Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 1,565 |  | 1,397 |  | 1,303 |  | 1,988 |  | 1,620 |  | 1,370 |  | 1,276 |  | 1,890 |  | 6,253 |  | 6,156 |  | 5,963 |
Operating Income | 173 |  | 305 |  | 207 |  | 300 |  | 191 |  | 304 |  | 207 |  | 224 |  | 985 |  | 926 |  | 689 |
Net Income | 67 |  | 155 |  | 92 |  | 153 |  | 79 |  | 160 |  | 88 |  | 107 |  | 467 |  | 434 |  | 293 |
Preferred Stock Dividends |  |  | 1 |  | 1 |  |  |  |  |  | 1 |  | 1 |  |  |  | 2 |  | 2 |  | 2 |
Net Income Available to Common Stockholders | $ 67 |  | $ 154 |  | $ 91 |  | $ 153 |  | $ 79 |  | $ 159 |  | $ 87 |  | $ 107 |  | $ 465 |  | $ 432 |  | $ 291 |
Maximum [Member] | CMS Energy Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 22.35 | [5] | $ 20.47 | [5] | $ 20.39 | [5] | $ 19.78 | [5] | $ 19.16 | [5] | $ 18.15 | [5] | $ 16.55 | [5] | $ 15.90 | [5] |  |  |  |  |  |
Minimum [Member] | CMS Energy Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 19.18 | [5] | $ 17.16 | [5] | $ 18.90 | [5] | $ 18.60 | [5] | $ 17.72 | [5] | $ 14.68 | [5] | $ 14.26 | [5] | $ 14.57 | [5] |  |  |  |  |  |
[1] | Includes an operating gain of $3 million related to a litigation settlement at CMS Viron.
[2] | 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. Also includes disposal-related losses of $10 million in additional tax expense resulting from an IRS audit adjustment related to a 2003 asset sale, a $6 million ($4 million net of tax) loss for the write down of CMS Energy's investment in Exeter, a $5 million ($3 million net of tax) loss for the increase in a liability for a 2007 asset sale, and a $5 million ($3 million net of tax) loss on the settlement of a 2002 asset sale indemnity.
[3] | Includes an operating loss of $11 million ($7 million net of tax) at Exeter and a loss of $3 million ($2 million net of tax) related to a litigation settlement at CMS Viron. Also includes a gain for the expiration of an indemnity obligation related to a 2007 asset sale. CMS Energy provided an indemnity to TAQA in connection with the sale of its ownership interests in businesses in the Middle East, Africa, and India, and recorded a $50 million provision for the contingent liability. This indemnity expired in 2009 and CMS Energy eliminated the liability from its consolidated balance sheets, recognizing a $45 million benefit ($28 million net of tax) to income (loss) from discontinued operations and a $5 million benefit to gain on asset sales, net.
[4] |
[5] | Based on New York Stock Exchange composite transactions.

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