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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income from continuing operataions before income taxes | $ 622 | $ 606 |  | $ 590 |
Income from continuing operations before income taxes | 620 | 604 |  | 587 |
Income tax expense at statutory rate | 217 | 211 |  | 205 |
MCIT law change, net of federal effect |  | (32) | [1] |  |
State and local income taxes, net of federal effect | 27 | 21 |  | 26 |
Medicare Part D exempt income law change |  |  |  | 3 | [2]
Other, net | 1 | (9) |  | (10) |
Income Tax Expense | 245 | 191 |  | 224 |
Effective income tax rate | 39.50% | 31.60% |  | 38.20% |
Deferred Income Tax Expense (Benefit) | 226 | 169 |  | 223 |
Consumers Energy Company [Member] |  |  |  |  |
Income from continuing operataions before income taxes | 736 | 734 |  | 688 |
Income tax expense at statutory rate | 258 | 257 |  | 241 |
State and local income taxes, net of federal effect | 36 | 24 |  | 26 |
Other, net | 3 | (14) |  | (13) |
Income Tax Expense | 297 | 267 |  | 254 |
Effective income tax rate | 40.40% | 36.40% |  | 36.90% |
Recognition of regulatory asset related to law change | 2,322 | 2,467 |  |  |
Deferred Income Tax Expense (Benefit) | 153 | 165 |  | 250 |
State Jurisdiction [Member] |  |  |  |  |
MCIT rate |  | 6.00% |  |  |
Tax Law Change [Member] |  |  |  |  |
Deferred Income Tax Expense (Benefit) |  | (32) |  |  |
Tax Law Change [Member] | Consumers Energy Company [Member] |  |  |  |  |
Recognition of regulatory asset related to law change |  | $ 128 |  |  |
[1] | For the year ended December 31, 2011, CMS Energy and Consumers remeasured their Michigan deferred income tax assets and liabilities due to the enactment in May 2011 of the MCIT, which became effective January 1, 2012. The MCIT, a simplified six percent corporate income tax, replaced the MBT, a complex multi-part tax. CMS Energy recognized a one-time non-cash deferred tax benefit of $32 million as a result of this remeasurement. Consumers recognized a $128 million regulatory asset (not including the effects of income tax gross-ups) related to this change in tax law.
[2] | For the year ended December 31, 2010, CMS Energy recognized deferred tax expense of $3 million to reflect the enactment of the Health Care Acts. The law change prospectively repealed the tax deduction for the portion of the health care costs reimbursed by the Medicare Part D subsidy for taxable years beginning after December 31, 2012.

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