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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 5	$ 19	$ 24	$ 65
Realized losses	(6)	(19)	(32)	(42)
Proceeds from sale of securities	$ 104	$ 194	$ 527	$ 707