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
	Mar. 31, 2025	Mar. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Realized gains	$ 8	$ 7
Realized losses	(8)	(6)
Proceeds from sale of securities	$ 139	$ 108