Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 24	$ 27
Interest cost	41	39
Expected return on plan assets	(87)	(84)
Amortization of net actuarial loss	29	49
Amortization of prior service credit	0	0
Net periodic benefit cost (credit)	7	31
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	8
Interest cost	12	11
Expected return on plan assets	(32)	(32)
Amortization of net actuarial loss	1	3
Amortization of prior service credit	(5)	(5)
Net periodic benefit cost (credit)	(17)	(15)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6
Interest cost	9	8
Expected return on plan assets	(21)	(22)
Amortization of net actuarial loss	1	3
Amortization of prior service credit	(3)	(3)
Net periodic benefit cost (credit)	$ (9)	$ (8)