Retirement Benefits and Trusteed Assets (Net Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 15	$ 43	$ 43
Interest cost	52	54	156	161
Expected return on plan assets	(86)	(89)	(256)	(264)
Amortization of net actuarial loss	15	2	44	5
Amortization of prior service credit	0	(1)	(1)	(2)
Settlements			0	7
Net periodic benefit credit	(5)	(19)	(14)	(50)
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit credit	(1)	(12)	(4)	(28)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	13	13
Interest cost	16	17	47	49
Expected return on plan assets	(30)	(28)	(90)	(83)
Amortization of net actuarial loss	2	2	5	7
Amortization of prior service credit	(3)	(4)	(8)	(14)
Settlements			0	0
Net periodic benefit credit	(11)	(9)	(33)	(28)
Other Postretirement Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	10	10
Interest cost	11	12	35	37
Expected return on plan assets	(20)	(18)	(59)	(55)
Amortization of net actuarial loss	1	0	1	0
Amortization of prior service credit	(1)	(3)	(5)	(10)
Net periodic benefit credit	$ (6)	$ (6)	$ (18)	$ (18)