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Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Revenue | $ 6,253 |  | $ 6,503 |  | $ 6,432 |
Operating Expenses |  |  |  |  |  |
Fuel for electric generation | 598 |  | 636 |  | 604 |
Purchased and interchange power | 1,364 |  | 1,282 |  | 1,239 |
Purchased power - related parties | 87 |  | 82 |  | 85 |
Cost of gas sold | 1,150 |  | 1,512 |  | 1,590 |
Maintenance and other operating expenses | 1,225 |  | 1,237 |  | 1,206 |
Depreciation and amortization | 598 |  | 546 |  | 576 |
General taxes | 229 |  | 205 |  | 210 |
Insurance settlement |  |  |  |  | (50) |
Gain on asset sales, net | (1) |  |  |  | (6) |
Total operating expenses | 5,250 |  | 5,500 |  | 5,454 |
Operating Income | 1,003 |  | 1,003 |  | 978 |
Other Income (Expense) |  |  |  |  |  |
Interest income | 5 |  | 9 |  | 19 |
Allowance for equity funds used during construction | 8 |  | 6 |  | 5 |
Income from equity method investees | 17 |  | 9 |  | 11 |
Other income | 11 |  | 16 |  | 32 |
Other expense | (33) |  | (22) |  | (24) |
Total other income | 8 |  | 18 |  | 43 |
Interest Charges |  |  |  |  |  |
Interest on long-term debt | 372 |  | 396 |  | 394 |
Other interest expense | 21 |  | 23 |  | 40 |
Allowance for borrowed funds used during construction | (4) |  | (4) |  | (3) |
Total interest charges | 389 |  | 415 |  | 431 |
Income Before Income Taxes | 622 |  | 606 |  | 590 |
Income Tax Expense | 245 |  | 191 |  | 224 |
Income From Continuing Operations | 377 |  | 415 |  | 366 |
Income (Loss) From Discontinued Operations | 7 | [1] | 2 | [2] | (23) | [3]
Net Income | 384 |  | 417 |  | 343 |
Income Attributable to Noncontrolling Interests | 2 |  | 2 |  | 3 |
Net income attributable to CMS Energy | 382 |  | 415 |  | 340 |
Charge for Deferred Issuance Costs on Preferred Stock |  |  |  |  | 8 |
Preferred Stock Dividends |  |  |  |  | 8 |
Net Income Available to Common Stockholders | 382 |  | 415 |  | 324 |
Net Income Attributable to Common Stockholders |  |  |  |  |  |
Amounts attributable to continuing operations | 375 |  | 413 |  | 347 |
Amounts attributable to discontinued operations | 7 |  | 2 |  | (23) |
Net Income Available to Common Stockholders | 382 |  | 415 |  | 324 |
Income Attributable to Noncontrolling Interests |  |  |  |  |  |
Amounts attributable to continuing operations | 2 |  | 2 |  | 3 |
Amounts attributable to discontinued operations |  |  |  |  |  |
Income attributable to noncontrolling interests | 2 |  | 2 |  | 3 |
Basic Earnings Per Average Common Share |  |  |  |  |  |
Basic earnings from continuing operations | $ 1.43 |  | $ 1.65 |  | $ 1.50 |
Basic earnings (loss) from discontinued operations | $ 0.03 |  | $ 0.01 |  | $ (0.10) |
Basic earnings attributable to common stock | $ 1.46 |  | $ 1.66 |  | $ 1.40 |
Diluted Earnings Per Average Common Share |  |  |  |  |  |
Diluted earnings from continuing operations | $ 1.39 |  | $ 1.57 |  | $ 1.36 |
Diluted earnings (loss) from discontinued operations | $ 0.03 |  | $ 0.01 |  | $ (0.08) |
Diluted earnings attributable to common stock | $ 1.42 |  | $ 1.58 |  | $ 1.28 |
Dividends Declared Per Common Share | $ 0.96 |  | $ 0.84 |  | $ 0.66 |
Consumers Energy Company [Member] |  |  |  |  |  |
Operating Revenue | 6,013 |  | 6,253 |  | 6,156 |
Operating Expenses |  |  |  |  |  |
Fuel for electric generation | 517 |  | 559 |  | 520 |
Purchased and interchange power | 1,339 |  | 1,267 |  | 1,224 |
Purchased power - related parties | 86 |  | 81 |  | 84 |
Cost of gas sold | 1,110 |  | 1,438 |  | 1,516 |
Maintenance and other operating expenses | 1,162 |  | 1,175 |  | 1,109 |
Depreciation and amortization | 592 |  | 542 |  | 572 |
General taxes | 223 |  | 206 |  | 205 |
Total operating expenses | 5,029 |  | 5,268 |  | 5,230 |
Operating Income | 984 |  | 985 |  | 926 |
Other Income (Expense) |  |  |  |  |  |
Interest income | 4 |  | 7 |  | 18 |
Interest and dividend income - related parties | 1 |  | 2 |  |  |
Allowance for equity funds used during construction | 8 |  | 6 |  | 5 |
Other income | 16 |  | 19 |  | 31 |
Other expense | (33) |  | (20) |  | (15) |
Total other income | (4) |  | 14 |  | 39 |
Interest Charges |  |  |  |  |  |
Interest on long-term debt | 232 |  | 251 |  | 246 |
Other interest expense | 16 |  | 18 |  | 34 |
Allowance for borrowed funds used during construction | (4) |  | (4) |  | (3) |
Total interest charges | 244 |  | 265 |  | 277 |
Income Before Income Taxes | 736 |  | 734 |  | 688 |
Income Tax Expense | 297 |  | 267 |  | 254 |
Net Income | 439 |  | 467 |  | 434 |
Preferred Stock Dividends | 2 |  | 2 |  | 2 |
Net Income Available to Common Stockholders | 437 |  | 465 |  | 432 |
Net Income Attributable to Common Stockholders |  |  |  |  |  |
Net Income Available to Common Stockholders | $ 437 |  | $ 465 |  | $ 432 |
[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.

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