XML 54 R75.htm IDEA: XBRL DOCUMENT v2.4.1.9
Income Taxes (Deferred Tax Assets (Liabilities)) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]    
Property, plant and equipment $ (3,832)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ (3,372)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Securitized regulatory assets (2)us-gaap_DeferredTaxLiabilitiesRegulatoryAssets (127)us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Tax credit carry-forwards 296us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 266us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Pension and benefits (152)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits (30)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
State net operating loss and credit carry-forwards 39dte_DeferredTaxAssetsStateNetOperatingLossAndCreditCarryForwards 43dte_DeferredTaxAssetsStateNetOperatingLossAndCreditCarryForwards
Deferred Tax Liabilities, Other (19)us-gaap_DeferredTaxLiabilitiesOther (92)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross (3,670)us-gaap_DeferredIncomeTaxLiabilities (3,312)us-gaap_DeferredIncomeTaxLiabilities
Less valuation allowance (31)us-gaap_DeferredTaxAssetsValuationAllowance (37)us-gaap_DeferredTaxAssetsValuationAllowance
Current deferred income tax assets (liabilities) 75us-gaap_DeferredTaxAssetsNetCurrent (28)us-gaap_DeferredTaxAssetsNetCurrent
Long-term deferred income tax liabilities (3,776)us-gaap_DeferredTaxLiabilitiesNoncurrent (3,321)us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred income tax assets 861us-gaap_DeferredTaxAssetsNet 934us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities (4,562)dte_DeferredTaxLiabilityNetofValuationAllowance (4,283)dte_DeferredTaxLiabilityNetofValuationAllowance
Deferred income tax liabilities $ (3,701)us-gaap_DeferredTaxLiabilities $ (3,349)us-gaap_DeferredTaxLiabilities