Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) employee plant facility NOV site	Dec. 31, 2010	Dec. 31, 2017 USD ($)	Jul. 31, 2009 plant
Loss Contingencies [Line Items]
Sulfur dioxide ambient air quality standard finalized		1 hour
Utility capital expenditures, expenditures for non-utility businesses, and contributions to equity method investees estimated for next year	$ 3,900,000,000
Accounts receivable	1,789,000,000		$ 1,758,000,000
Reserve recorded related to pre-petition receivables	91,000,000		49,000,000
Long-lived assets used in producing electric output for sale	$ 21,650,000,000		20,721,000,000
Power and Industrial Projects
Loss Contingencies [Line Items]
Number of generating plants operated with ownership interests held | plant	5
Labor force concentration risk | Workforce subject to collective bargaining arrangements
Loss Contingencies [Line Items]
Approximate number of employees | employee	5,200
PG&E | Power and Industrial Projects
Loss Contingencies [Line Items]
Accounts receivable	$ 12,000,000
Reserve recorded related to pre-petition receivables	0
Long-lived assets used in producing electric output for sale	106,000,000
Impairment loss	0
Equity investments, including note receivable	77,000,000
Other than temporary decline in equity investments	$ 0
Synthetic fuel guarantees
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations	90 days
Maximum potential liability	$ 400,000,000
Reduced emissions fuel guarantees
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations	90 days
Maximum potential liability	$ 359,000,000
NEXUS Pipeline | DTE Gas
Loss Contingencies [Line Items]
Maximum potential liability	$ 242,000,000
Guarantee termination, minimum threshold, period following end of primary term of capacity lease agreements	2 months
NEXUS Pipeline | Texas Eastern Transmission, LP
Loss Contingencies [Line Items]
Maximum potential liability	$ 377,000,000
Percentage of all payment obligations due and payable	50.00%
Guarantee termination, minimum threshold, period following end of primary term of capacity lease agreements	2 months
NEXUS Pipeline | Vector
Loss Contingencies [Line Items]
Maximum potential liability	$ 7,000,000
Percentage of all payment obligations due and payable	50.00%
Guarantee termination, minimum threshold, period following end of primary term of capacity lease agreements	15 years
Other guarantees
Loss Contingencies [Line Items]
Maximum potential liability	$ 64,000,000
Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding	$ 76,000,000
Reduction of Carbon Emissions by early 2020's
Loss Contingencies [Line Items]
Goal to reduce carbon emissions, percentage	30.00%
Reduction of Carbon Emissions by 2030
Loss Contingencies [Line Items]
Goal to reduce carbon emissions, percentage	45.00%
Reduction of Carbon Emissions by 2040
Loss Contingencies [Line Items]
Goal to reduce carbon emissions, percentage	75.00%
Reduction of Carbon Emissions by 2050
Loss Contingencies [Line Items]
Goal to reduce carbon emissions, percentage	80.00%
DTE Electric
Loss Contingencies [Line Items]
Number of power plants allegedly in violation | plant				5
Number of NOVs/FOVs currently being discussed with the EPA | NOV	2
Amount spent to comply with air pollution requirements	$ 2,400,000,000
Estimated capital expenditures	$ 0
Number of former MGP sites | site	3
Accrued for remediation related to the sites	$ 7,000,000		6,000,000
Number of permitted engineered coal ash storage facilities owned | facility	3
Time period to comply with coal combustion residual requirements and effluent limitations guidelines	6 years
Utility capital expenditures, expenditures for non-utility businesses, and contributions to equity method investees estimated for next year	$ 2,200,000,000
Accounts receivable	750,000,000		791,000,000
Reserve recorded related to pre-petition receivables	53,000,000		31,000,000
Long-lived assets used in producing electric output for sale	$ 15,437,000,000		14,988,000,000
DTE Electric | Labor force concentration risk | Workforce subject to collective bargaining arrangements
Loss Contingencies [Line Items]
Approximate number of employees | employee	2,800
DTE Electric | Coal combustion residual rule
Loss Contingencies [Line Items]
Estimated cost associated with building new facilities	$ 565,000,000
DTE Gas
Loss Contingencies [Line Items]
Number of former MGP sites | site	14
Accrued for remediation related to the sites	$ 25,000,000		$ 41,000,000
Amortization period for MGP costs (in years)	10 years
DTE Gas | NEXUS Pipeline | DTE Gas
Loss Contingencies [Line Items]
Percentage of all payment obligations due and payable	50.00%
DTE Gas | Cleanup completed and site closed
Loss Contingencies [Line Items]
Number of former MGP sites | site	6
DTE Gas | Partial closure completed
Loss Contingencies [Line Items]
Number of former MGP sites | site	6
NEXUS | NEXUS Pipeline | DTE Gas
Loss Contingencies [Line Items]
Capacity lease agreement term	15 years
NEXUS | NEXUS Pipeline | Texas Eastern Transmission, LP
Loss Contingencies [Line Items]
Capacity lease agreement term	15 years
NEXUS | NEXUS Pipeline | Vector
Loss Contingencies [Line Items]
Capacity lease agreement term	15 years