Fair Value (Gains and Losses and Proceeds from the Sale of Securities by the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - Nuclear decommissioning trust fund - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 11	$ 5	$ 41	$ 24
Realized losses	(6)	(6)	(22)	(32)
Proceeds from sale of securities	$ 91	$ 104	$ 438	$ 527