Income Taxes (Income Taxes Paid) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
U.S. Federal	$ (266)	$ (230)	$ 2
U.S. State and Local	(3)	(3)	(7)
Foreign	2	3	0
Total	(267)	(230)	(5)
DTE Electric
Income Tax Paid, by Individual Jurisdiction [Line Items]
U.S. Federal	(273)	(231)	9
Total	(273)	(231)	15
Michigan
Income Tax Paid, by Individual Jurisdiction [Line Items]
U.S. State and Local	(5)	(5)	(10)
Michigan | DTE Electric
Income Tax Paid, by Individual Jurisdiction [Line Items]
U.S. State and Local	0	0	6
Pennsylvania
Income Tax Paid, by Individual Jurisdiction [Line Items]
U.S. State and Local	1	2	2
Other
Income Tax Paid, by Individual Jurisdiction [Line Items]
U.S. State and Local	$ 1	$ 0	$ 1