Retirement Benefits and Trusteed Assets (Net Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 14
Interest cost	52	54
Expected return on plan assets	(85)	(88)
Amortization of net actuarial loss	15	2
Amortization of prior service credit	(1)	(1)
Settlements	0	2
Net periodic benefit credit	(5)	(17)
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit credit	(1)	(9)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4
Interest cost	16	16
Expected return on plan assets	(30)	(28)
Amortization of net actuarial loss	2	3
Amortization of prior service credit	(3)	(4)
Settlements	0	0
Net periodic benefit credit	(11)	(9)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	12	12
Expected return on plan assets	(20)	(18)
Amortization of prior service credit	(1)	(3)
Net periodic benefit credit	$ (6)	$ (6)