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Long-Term Debt (Long Term Debt Outstanding and Weighted Average Interest Rates) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 5,270us-gaap_LongTermDebt  
Long Term Debt excluding Securitization, Debentures and Capital Leases 5,154dteelectric_LongTermDebtexcludingSecuritizationDebenturesandCapitalLeases 4,844dteelectric_LongTermDebtexcludingSecuritizationDebenturesandCapitalLeases
Less amount of long-term debt due within one year (10)us-gaap_DebtCurrent (304)us-gaap_DebtCurrent
Long-term Debt, Excluding Current Maturities 5,144us-gaap_LongTermDebtNoncurrent 4,540us-gaap_LongTermDebtNoncurrent
Securitization bonds 105dteelectric_SecuritizationBonds 302dteelectric_SecuritizationBonds
Less amount of Securitization Bonds due within one year (105)dteelectric_SecuritizationBondsCurrent (197)dteelectric_SecuritizationBondsCurrent
Securitization bonds 0dteelectric_Securitizationbondsnoncurrent 105dteelectric_Securitizationbondsnoncurrent
Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 4.50%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Debt Instrument, Maturity Date Range, Start Mar. 31, 2016  
Debt Instrument, Maturity Date Range, End Jun. 01, 2044  
Long-term debt 4,824us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
4,286us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Tax Exempt Revenue Bonds [Member]    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 5.20%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= dteelectric_TaxExemptRevenueBondsMember
 
Debt Instrument, Maturity Date Range, Start Jul. 01, 2020  
Debt Instrument, Maturity Date Range, End Dec. 01, 2030  
Long-term debt $ 330us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= dteelectric_TaxExemptRevenueBondsMember
$ 558us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= dteelectric_TaxExemptRevenueBondsMember
Securitization Bonds [Member]    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 6.60%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= dteelectric_SecuritizationBondsMember
 
Debt Instrument, Maturity Date Mar. 15, 2015