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Income Taxes (Principal Components of Deferred Income Tax Assets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Employee benefits | $ 3 | $ (126)
Gas inventory | (147) | (155)
Property, plant and equipment | (1,783) | (1,668)
Net regulatory tax liability | 131 | 70
Reserves and accruals | 71 | 86
Securitized costs | (73) | (96)
Tax loss and credit carryforwards | 733 | 806
Other | (15) | 92
Gross Deferred Tax Liabilities | (1,080) | (991)
Less: valuation allowance | (3) | (20)
Total net deferred income tax liabilities | (1,083) | (1,011)
Deferred tax assets, net of valuation reserves | 935 | 1,034
Deferred tax liabilities | (2,018) | (2,045)
Consumers Energy Company [Member] |  |
Employee benefits | (36) | (158)
Gas inventory | (147) | (155)
Property, plant and equipment | (1,848) | (1,742)
Net regulatory tax liability | 131 | 70
Reserves and accruals | 41 | 44
Securitized costs | (73) | (96)
Tax loss and credit carryforwards | 61 | 67
Other | (13) | 81
Gross Deferred Tax Liabilities | (1,884) | (1,889)
Less: valuation allowance | (1) | (1)
Total net deferred income tax liabilities | (1,885) | (1,890)
Deferred tax assets, net of valuation reserves | 232 | 261
Deferred tax liabilities | $ (2,117) | $ (2,151)

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