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Fair Value (Realized Gains and Losses and Proceeds from Sale of Securities by Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - Nuclear decommissioning trust fund - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 27	$ 11	$ 40	$ 41
Realized losses	(9)	(6)	(26)	(22)
Proceeds from sale of securities	$ 221	$ 91	$ 592	$ 438

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