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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 23	$ 11	$ 30	$ 19
Realized losses	(10)	(12)	(16)	(26)
Proceeds from sale of securities	$ 239	$ 257	$ 347	$ 423