Significant Accounting Policies (Schedule of Other Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	$ 29	$ 27	$ 25
Contract services	28	27	28
Gains from rabbi trust securities	3	8	28
Income from REF entities	0	141	139
Equity earnings (losses) of equity method investees	(14)	38	26
Other	12	13	13
Other income	58	254	259
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	26	25	23
Contract services	27	27	28
Gains from rabbi trust securities	3	8	28
Other	9	11	8
Other income	$ 65	$ 71	$ 87