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Jointly Owned Utility Plant (Details Textuals)
Dec. 31, 2014
facilities
Jointly Owned Utility Plant Interests [Line Items]  
Jointly owned utility plant, number of plants 2dteelectric_JointlyOwnedUtilityPlantNumberofPlants
Belle River Unit 1 [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 63.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= dteelectric_BelleRiverUnit1Member
Belle River Facilities used jointly by Belle River and St. Clair Power Plants [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 81.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= dteelectric_BelleRiverFacilitiesusedjointlybyBelleRiverandSt.ClairPowerPlantsMember
Belle River Unit 2 [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 75.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= dteelectric_BelleRiverUnit2Member
Belle River [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Joint owners percentage of the total capacity energy and related responsibilities 19.00%dteelectric_JointOwnersPercentageOfTotalCapacityEnergyAndRelatedResponsibilities
/ us-gaap_JointlyOwnedUtilityPlantAxis
= dteelectric_BelleRiverMember
Ludington [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership interest 49.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= dteelectric_LudingtonMember
Joint owners percentage of the total capacity energy and related responsibilities 51.00%dteelectric_JointOwnersPercentageOfTotalCapacityEnergyAndRelatedResponsibilities
/ us-gaap_JointlyOwnedUtilityPlantAxis
= dteelectric_LudingtonMember