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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	$ 26	$ 24	$ 72	$ 62
Contract services	11	8	31	21
Equity earnings of equity method investees	5	12	16	36
Investment income	8	7	16	16
Other	4	3	12	11
Total other income	54	54	147	146
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	25	23	71	60
Contract services	11	8	31	21
Investment income	5	6	12	13
Other	4	4	9	11
Total other income	$ 45	$ 41	$ 123	$ 105

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