Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	$ 7,000,000		$ 7,000,000
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	$ 28,000,000	78,000,000	$ 79,000,000
DTE Electric | Pension plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year	$ 0		$ 0