Commitments and Contingencies (Details Textuals) $ in Millions		9 Months Ended	12 Months Ended
	Jun. 14, 2018	Sep. 30, 2018 USD ($) employee facility NOV site	Dec. 31, 2017 USD ($)	Jul. 31, 2009 plant
Loss Contingencies [Line Items]
Period case was stayed for, pending settlement negotiations	180 days
Unrecorded unconditional purchase obligation		$ 3,600
Workforce subject to collective bargaining arrangements | Labor force concentration risk
Loss Contingencies [Line Items]
Number of employees | employee		5,000
Synthetic fuel
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations		90 days
Maximum potential liability		$ 400
Reduced emissions fuel guarantees
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations		90 days
Maximum potential liability		$ 468
NEXUS pipeline
Loss Contingencies [Line Items]
Guarantee termination, minimum threshold, period following end of primary term of capacity lease agreements		2 months
Other guarantees
Loss Contingencies [Line Items]
Maximum potential liability		$ 56
Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding		$ 66
DTE Electric
Loss Contingencies [Line Items]
Number of power plants in violation | plant				5
Number of NOVs/FOVs | NOV		2
Environmental capital expenditures through prior year end			$ 2,400
Number of former MGP sites | site		3
Accrued for remediation		$ 5	6
Number of permitted engineered ash storage facilities owned | facility		3
Unrecorded unconditional purchase obligation		$ 1,900
DTE Electric | Workforce subject to collective bargaining arrangements | Labor force concentration risk
Loss Contingencies [Line Items]
Number of employees | employee		2,700
DTE Gas
Loss Contingencies [Line Items]
Number of former MGP sites | site		14
Accrued for remediation		$ 32	$ 41
Amortization period (in years)		10 years
DTE Gas | NEXUS pipeline
Loss Contingencies [Line Items]
Maximum potential liability		$ 85
Lease agreement term		15 years
Percentage of payment obligations due		50.00%
DTE Gas | Clean up completed and site closed
Loss Contingencies [Line Items]
Number of former MGP sites | site		6
DTE Gas | Partial closure complete
Loss Contingencies [Line Items]
Number of former MGP sites | site		6
Texas Eastern Transmission, LP | NEXUS pipeline
Loss Contingencies [Line Items]
Maximum potential liability		$ 44
Lease agreement term		15 years
Percentage of payment obligations due		50.00%