Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 23	$ 28	$ 47
Interest cost	53	42	107	83
Expected return on plan assets	(87)	(86)	(175)	(173)
Amortization of net actuarial loss	1	28	3	57
Amortization of prior service credit	0	0	(1)	0
Settlements	5	0	7	0
Net periodic benefit cost (credit)	(14)	7	(31)	14
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	(7)	9	(16)	18
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	7	9	14
Interest cost	16	12	32	24
Expected return on plan assets	(27)	(31)	(55)	(63)
Amortization of net actuarial loss	2	1	5	2
Amortization of prior service credit	(6)	(5)	(10)	(10)
Settlements	0	0	0	0
Net periodic benefit cost (credit)	(10)	(16)	(19)	(33)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5	7	10
Interest cost	13	9	25	18
Expected return on plan assets	(19)	(21)	(37)	(42)
Amortization of net actuarial loss	0	1	0	2
Amortization of prior service credit	(4)	(3)	(7)	(6)
Net periodic benefit cost (credit)	$ (6)	$ (9)	$ (12)	$ (18)