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Income Taxes (Components of Income Tax Expense) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense (benefit)      
Federal $ (16)us-gaap_CurrentFederalTaxExpenseBenefit $ 74us-gaap_CurrentFederalTaxExpenseBenefit $ 190us-gaap_CurrentFederalTaxExpenseBenefit
State and other income tax 24us-gaap_CurrentStateAndLocalTaxExpenseBenefit 16us-gaap_CurrentStateAndLocalTaxExpenseBenefit 49us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current income taxes 8us-gaap_CurrentIncomeTaxExpenseBenefit 90us-gaap_CurrentIncomeTaxExpenseBenefit 239us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense      
Federal 289us-gaap_DeferredFederalIncomeTaxExpenseBenefit 122us-gaap_DeferredFederalIncomeTaxExpenseBenefit 39us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and other income tax 67us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 42us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 8us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income taxes 356us-gaap_DeferredIncomeTaxExpenseBenefit 164us-gaap_DeferredIncomeTaxExpenseBenefit 47us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense 364us-gaap_IncomeTaxExpenseBenefit 254us-gaap_IncomeTaxExpenseBenefit 286us-gaap_IncomeTaxExpenseBenefit
Discontinued operations 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation (29)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Total $ 364dte_IncomeTaxExpenseBenefitincludingDiscontinuedOperations $ 254dte_IncomeTaxExpenseBenefitincludingDiscontinuedOperations $ 257dte_IncomeTaxExpenseBenefitincludingDiscontinuedOperations