Retirement Benefits and Trusteed Assets (Net Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 14
Interest cost	54	52
Expected return on plan assets	(73)	(85)
Amortization of net actuarial loss (gain)	22	15
Amortization of prior service credit	0	(1)
Net periodic benefit cost (credit)	15	(5)
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	(14)	(1)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4
Interest cost	15	16
Expected return on plan assets	(29)	(30)
Amortization of net actuarial loss (gain)	0	2
Amortization of prior service credit	0	(3)
Net periodic benefit cost (credit)	(10)	(11)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	12	12
Expected return on plan assets	(19)	(20)
Amortization of net actuarial loss (gain)	(1)	0
Amortization of prior service credit	0	(1)
Net periodic benefit cost (credit)	$ (5)	$ (6)