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Income Taxes (Principal Components of Deferred Income Tax Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Employee benefits $ (126) $ (76)
Gas inventory (155) (177)
Property, plant and equipment (1,668) (1,382)
Regulatory tax liability 70 162
Reserves and accruals 86 101
Securitized costs (96) (120)
Tax loss and credit carryforwards 806 996
Other 92 (103)
Gross Deferred Tax Liabilities (991) (599)
Less: valuation allowance (20) (19)
Total net deferred income tax liabilities (1,011) (618)
Deferred tax assets, net of valuation reserves 1,034 1,240
Deferred tax liabilities (2,045) (1,858)
Consumers Energy Company [Member]
   
Employee benefits (158) (110)
Gas inventory (155) (177)
Property, plant and equipment (1,742) (1,464)
Regulatory tax liability 70 162
Reserves and accruals 44 45
Securitized costs (96) (120)
Tax loss and credit carryforwards 67 281
Other 81 (115)
Gross Deferred Tax Liabilities (1,889) (1,498)
Less: valuation allowance (1)  
Total net deferred income tax liabilities (1,890) (1,498)
Deferred tax assets, net of valuation reserves 261 488
Deferred tax liabilities $ (2,151) $ (1,986)