XML 76 R36.htm IDEA: XBRL DOCUMENT v2.4.1.9
Organization and Basis of Presentation (Details Textuals) (USD $)
Mar. 31, 2015
customers
Number of electric utility customers 2,100,000dte_NumberofElectricUtilityCustomers
Number of gas utility customers 1,200,000dte_NumberofGasUtilityCustomers
Significant Potential Exposure to Loss Due to VIE Long-Term Purchase Contracts $ 0us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
DTE Electric  
Significant Potential Exposure to Loss Due to VIE Long-Term Purchase Contracts $ 0us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ dei_LegalEntityAxis
= dte_DTEElectricMember