Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, remainder of fiscal year (up to)	$ 185,000,000		$ 185,000,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, remainder of fiscal year (up to)	0		0
DTE Electric | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension cost	25,000,000	$ 22,000,000	51,000,000	$ 45,000,000
Anticipated contributions, remainder of fiscal year (up to)	$ 160,000,000		$ 160,000,000