Significant Accounting Policies (Schedule of Other Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	$ 86	$ 42	$ 29
Contract services	34	26	28
Investment income	17	17	3
Equity earnings (losses) of equity method investees	15	3	(14)
Other	15	14	12
Other income	167	102	58
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	84	40	26
Contract services	33	25	27
Investment income	13	11	3
Other	14	11	9
Other income	$ 144	$ 87	$ 65