Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 13	$ 10	$ 10
Additions for tax positions of prior years	2	5	0
Reductions for tax positions of prior years	(5)	(2)	0
Settlements	(10)	0	0
Unrecognized tax benefits, ending balance	0	13	10
DTE Electric
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	13	13	13
Settlements	(13)	0	0
Unrecognized tax benefits, ending balance	$ 0	$ 13	$ 13