Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension plans | Qualified Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	$ 107,000,000		$ 107,000,000
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	0		0
DTE Electric | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost	26,000,000	$ 25,000,000	52,000,000	$ 51,000,000
DTE Electric | Pension plans | Qualified Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	$ 100,000,000		$ 100,000,000