Retirement Benefits and Trusteed Assets (Net Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 15	$ 14	$ 29	$ 28
Interest cost	52	53	104	107
Expected return on plan assets	(85)	(87)	(170)	(175)
Amortization of net actuarial loss	14	1	29	3
Amortization of prior service credit	0	0	(1)	(1)
Settlements	0	5	0	7
Net periodic benefit credit	(4)	(14)	(9)	(31)
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit credit	(2)	(7)	(3)	(16)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	9	9
Interest cost	15	16	31	32
Expected return on plan assets	(30)	(27)	(60)	(55)
Amortization of net actuarial loss	1	2	3	5
Amortization of prior service credit	(2)	(6)	(5)	(10)
Settlements	0	0	0	0
Net periodic benefit credit	(11)	(10)	(22)	(19)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	7	7
Interest cost	12	13	24	25
Expected return on plan assets	(19)	(19)	(39)	(37)
Amortization of prior service credit	(3)	(4)	(4)	(7)
Net periodic benefit credit	$ (6)	$ (6)	$ (12)	$ (12)