Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 25	$ 27	$ 72	$ 81
Interest cost	41	39	124	118
Expected return on plan assets	(87)	(84)	(260)	(254)
Amortization of net actuarial loss	29	49	86	147
Amortization of prior service credit	0	0	0	0
Net periodic benefit cost (credit)	8	31	22	92
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	8	20	23
Interest cost	12	12	36	35
Expected return on plan assets	(32)	(33)	(95)	(97)
Amortization of net actuarial loss	1	3	3	10
Amortization of prior service credit	(4)	(5)	(14)	(15)
Net periodic benefit cost (credit)	(17)	(15)	(50)	(44)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	15	17
Interest cost	10	8	28	25
Expected return on plan assets	(22)	(22)	(64)	(65)
Amortization of net actuarial loss	2	3	4	9
Amortization of prior service credit	(4)	(3)	(10)	(10)
Net periodic benefit cost (credit)	$ (9)	$ (8)	$ (27)	$ (24)