Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 24
Interest cost	54	41
Expected return on plan assets	(88)	(87)
Amortization of net actuarial loss	2	29
Amortization of prior service credit	(1)	0
Settlements	2	0
Net periodic benefit cost (credit)	(17)	7
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	(9)	9
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	7
Interest cost	16	12
Expected return on plan assets	(28)	(32)
Amortization of net actuarial loss	3	1
Amortization of prior service credit	(4)	(5)
Settlements	0	0
Net periodic benefit cost (credit)	(9)	(17)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	5
Interest cost	12	9
Expected return on plan assets	(18)	(21)
Amortization of net actuarial loss	0	1
Amortization of prior service credit	(3)	(3)
Net periodic benefit cost (credit)	$ (6)	$ (9)