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Income Taxes (Principal Components Of Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Employee benefits | $ (127) | $ (72)
Gas inventory | (96) | (117)
Property, plant and equipment | (2,429) | (2,217)
Net regulatory tax liability | 50 | 65
Reserves and accruals | 59 | 63
Securitized costs | (122) | (144)
Tax loss and credit carryforwards | 657 | 676
Other | (5) |
Gross Deferred Tax Liabilities | (2,013) | (1,746)
Less: valuation allowance | (4) | (2)
Total net deferred income tax liabilities | (2,017) | (1,748)
Deferred tax assets, net of valuation reserves | 762 | 802
Deferred tax liabilities | (2,779) | (2,550)
Consumers Energy Company [Member] |  |
Employee benefits | (156) | (103)
Gas inventory | (96) | (117)
Property, plant and equipment | (2,457) | (2,263)
Net regulatory tax liability | 50 | 65
Reserves and accruals | 30 | 34
Securitized costs | (122) | (144)
Tax loss and credit carryforwards | 46 | 45
Other | (5) | (2)
Gross Deferred Tax Liabilities | (2,710) | (2,485)
Less: valuation allowance |  | (1)
Total net deferred income tax liabilities | (2,710) | (2,486)
Deferred tax assets, net of valuation reserves | 126 | 143
Deferred tax liabilities | $ (2,836) | $ (2,629)

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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from tax carryforwards and the excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. + References No definition available. + Details
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