Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 15	$ 25	$ 43	$ 72
Interest cost	54	41	161	124
Expected return on plan assets	(89)	(87)	(264)	(260)
Amortization of net actuarial loss	2	29	5	86
Amortization of prior service credit	(1)	0	(2)	0
Settlements			7	0
Net periodic benefit cost (credit)	(19)	8	(50)	22
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	(12)	9	(28)	27
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	6	13	20
Interest cost	17	12	49	36
Expected return on plan assets	(28)	(32)	(83)	(95)
Amortization of net actuarial loss	2	1	7	3
Amortization of prior service credit	(4)	(4)	(14)	(14)
Settlements			0	0
Net periodic benefit cost (credit)	(9)	(17)	(28)	(50)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	5	10	15
Interest cost	12	10	37	28
Expected return on plan assets	(18)	(22)	(55)	(64)
Amortization of net actuarial loss	0	2	0	4
Amortization of prior service credit	(3)	(4)	(10)	(10)
Net periodic benefit cost (credit)	$ (6)	$ (9)	$ (18)	$ (27)