XML 100 R60.htm IDEA: XBRL DOCUMENT v2.4.1.9
Long-Term Debt (Debt Issuances) (Details) (USD $)
Mar. 31, 2015
Debt Instrument [Line Items]  
Face amount $ 500,000,000us-gaap_DebtInstrumentFaceAmount
DTE Electric | Mortgages | March 3.70% Mortgage Bonds Maturing 2045  
Debt Instrument [Line Items]  
Interest Rate 3.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dte_March20153.70MortgageBondsMaturingin2045Member
/ dei_LegalEntityAxis
= dte_DTEElectricMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Face amount $ 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= dte_March20153.70MortgageBondsMaturingin2045Member
/ dei_LegalEntityAxis
= dte_DTEElectricMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember