Leases (Components of Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 18	$ 19	$ 21
Finance lease cost:
Amortization of right-of-use assets	7	7	5
Interest of lease liabilities	1	1	0
Total finance lease cost	8	8	5
Variable lease cost	9	9	10
Short-term lease cost	19	14	11
Total lease cost	54	50	47
DTE Electric
Lessee, Lease, Description [Line Items]
Operating lease cost	12	14	14
Finance lease cost:
Amortization of right-of-use assets	6	6	4
Interest of lease liabilities	0	0	0
Total finance lease cost	6	6	4
Variable lease cost	0	0	0
Short-term lease cost	10	6	6
Total lease cost	$ 28	$ 26	$ 24