Significant Accounting Policies (Schedule of Other Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	$ 42	$ 29	$ 27
Contract services	26	28	27
Investment income	17	3	14
Equity earnings (losses) of equity method investees	3	(14)	38
Income from REF entities	0	0	141
Other	14	12	7
Other income	102	58	254
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	40	26	25
Contract services	25	27	27
Investment income	11	3	10
Other	11	9	9
Other income	$ 87	$ 65	$ 71