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Long-Term Debt (Debt Redemptions) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Debt Instrument [Line Items]  
Debt redemption amount $ 117us-gaap_ExtinguishmentOfDebtAmount
Securitization Bonds | DTE Electric | March 2015 Securitization Bonds 6.62% due 2015 [Member]  
Debt Instrument [Line Items]  
Interest Rate 6.62%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dte_March2015SecuritizationBonds6.62due2015Member
/ dei_LegalEntityAxis
= dte_DTEElectricMember
/ us-gaap_LongtermDebtTypeAxis
= dte_SecuritizationBondsMember
Debt redemption amount 105us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= dte_March2015SecuritizationBonds6.62due2015Member
/ dei_LegalEntityAxis
= dte_DTEElectricMember
/ us-gaap_LongtermDebtTypeAxis
= dte_SecuritizationBondsMember
Mortgages | DTE Electric | 7.904% Mortgage Bonds Due 2015  
Debt Instrument [Line Items]  
Interest Rate 7.904%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dte_March2015MortgageBonds7.904due2016Member
/ dei_LegalEntityAxis
= dte_DTEElectricMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Debt redemption amount 10us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= dte_March2015MortgageBonds7.904due2016Member
/ dei_LegalEntityAxis
= dte_DTEElectricMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Other Long Term Debt | Various Other Long Term Debt Due 2015  
Debt Instrument [Line Items]  
Debt redemption amount $ 2us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= dte_VariousOtherLongTermDebtDue2015Member
/ us-gaap_LongtermDebtTypeAxis
= dte_LongTermDebtOtherMember