Retirement Benefits and Trusteed Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 23	$ 27	$ 47	$ 54
Interest cost	42	40	83	79
Expected return on plan assets	(86)	(86)	(173)	(170)
Amortization of net actuarial loss	28	49	57	98
Amortization of prior service credit	0	0	0	0
Net periodic benefit cost (credit)	7	30	14	61
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	7	14	15
Interest cost	12	12	24	23
Expected return on plan assets	(31)	(32)	(63)	(64)
Amortization of net actuarial loss	1	4	2	7
Amortization of prior service credit	(5)	(5)	(10)	(10)
Net periodic benefit cost (credit)	(16)	(14)	(33)	(29)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	10	11
Interest cost	9	9	18	17
Expected return on plan assets	(21)	(21)	(42)	(43)
Amortization of net actuarial loss	1	3	2	6
Amortization of prior service credit	(3)	(4)	(6)	(7)
Net periodic benefit cost (credit)	$ (9)	$ (8)	$ (18)	$ (16)