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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 11	$ 32	$ 19	$ 46
Realized losses	(12)	(18)	(26)	(23)
Proceeds from sale of securities	$ 257	$ 306	$ 423	$ 513