Commitments and Contingencies (Details Textuals)		4 Months Ended	6 Months Ended
	May. 16, 2014 kWh	May. 15, 2014 $ / MWh	Jun. 30, 2015 USD ($) employee facility instance facilities	Dec. 31, 2014 USD ($)	Dec. 31, 2010 instance
Loss Contingencies [Line Items]
Number of NOVs | instance					2
Possible environmental capital expenditures to comply with requirements			$ 1,000,000
Estimated maximum spend to upgrade treatment technology to biological treatment to meet future requirements			$ 15,000,000
Length of notice of intent to sue from the Group Against Smog and Pollution			60 days
Fine related to consent order and agreement with Allegheny County related to NOV			$ 300,000
Estimated expenditures for a supplemental environmental project to enhance particulate collection efficiency			$ 300,000
EPA sulfur dioxide ambient air quality standard			1 hour
Commitment amount			$ 7,800,000,000
Future commitments			$ 2,600,000,000
Represented employees
Loss Contingencies [Line Items]
Entity number of employees | employee			4,900
Synthetic Fuel
Loss Contingencies [Line Items]
Term after expiration of statutes of limitations			90 days
Maximum potential liability			$ 850,000,000
Emissions
Loss Contingencies [Line Items]
Term after expiration of statutes of limitations			90 days
Maximum potential liability			$ 210,000,000
Other Guarantees
Loss Contingencies [Line Items]
Maximum potential liability			66,000,000
Performance Surety Bonds
Loss Contingencies [Line Items]
Performance bonds outstanding			49,000,000
DTE Electric
Loss Contingencies [Line Items]
Environmental capital expenditures through prior year end			2,200,000,000
Environmental capital expenditures in current year			100,000,000
Environmental capital expenditures in future years			$ 30,000,000
EPA is alleging detroit edison power plants violated new source performance standards | facility			5
Number of NOVs/FOVs currently being discussed with the EPA | instance			2
Time period to complete studies on cooling water intake structures impacts on fish - EPA ruling			3 years
Number of former MGP sites | facility			3
Accrual for environmental loss contingencies, gross			$ 9,000,000	$ 10,000,000
Insurance coverage for extra expense when to necessitate power plant when unavailable			$ 490,000,000
Waiting period of policy			84 days
Period of coverage of policy for extra expenses			3 years
Primary coverage			$ 1,500,000,000
Coverage for stabilization decontamination debris removal repair and replacement of property and decommissioning			1,250,000,000
Combined coverage limit for total property damage			2,750,000,000
Insurance deductible for nuclear power plant			1,000,000
Total limit for property damage for non-nuclear events			2,000,000,000
Limit for property damage for non-nuclear events aggregate of extra expenses			$ 328,000,000
Limit for property damage for non-nuclear events aggregate of extra expenses of period			2 years
Time period for TRIA insurance after the first loss from terrorism			1 year
NEIL policies against terrorism loss			$ 3,200,000,000
Amount per event loss associated with nuclear power plants			45,000,000
Maintenance of public liability insurance for nuclear power plants			375,000,000
Aggregate limit of liabilities arises from terrorist act outside scope of trials subject to one industry			300,000,000
Deferred premium charged levied against each licensed nuclear facility			127,000,000
Limit deferred premium charges per year			19,000,000
Company obligated to pay DOE fee of Fermi 2 electricity generated and sold | $ / MWh		1
New DOE fee for nuclear waste | kWh	0
Commitment amount			2,400,000,000
Future commitments			$ 1,900,000,000
DTE Electric | Represented employees
Loss Contingencies [Line Items]
Entity number of employees | employee			2,600
DTE Electric | Coal Combustion Residual Rule
Loss Contingencies [Line Items]
Environmental Loss Contingencies, Expected Period to Build New Facilities			3 years
Accrual for Environmental Loss Contingencies, Provision for New Losses			$ 120,000,000
DTE Electric | Coal Combustion Residual Rule | Minimum
Loss Contingencies [Line Items]
Environmental Loss Contingencies, Period to Incur Costs			2 years
DTE Electric | Coal Combustion Residual Rule | Maximum
Loss Contingencies [Line Items]
Environmental Loss Contingencies, Period to Incur Costs			10 years
DTE Gas
Loss Contingencies [Line Items]
Number of former MGP sites | facility			14
Accrual for environmental loss contingencies, gross			$ 23,000,000	$ 24,000,000
Period gas utility can amortize MGP costs			10 years
DTE Gas | Cleanup completed and site closed
Loss Contingencies [Line Items]
Number of former MGP sites | facility			4
DTE Gas | Complete closure expected by end of fiscal year
Loss Contingencies [Line Items]
Number of former MGP sites | facilities			2