Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, remainder of fiscal year (up to)	$ 185,000,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, remainder of fiscal year (up to)	0
DTE Electric | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension cost	26,000,000	$ 23,000,000
Anticipated contributions, remainder of fiscal year (up to)	$ 160,000,000