Retirement Benefits and Trusteed Assets (Contributions to the VEBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Contribution Plan Disclosure [Line Items]
Contributions	$ 80	$ 76	$ 75
DTE Electric
Defined Contribution Plan Disclosure [Line Items]
Contributions	37	35	35
Retiree healthcare plan (VEBA)
Defined Contribution Plan Disclosure [Line Items]
Contributions	15	15	16
Retiree healthcare plan (VEBA) | DTE Electric
Defined Contribution Plan Disclosure [Line Items]
Contributions	$ 7	$ 6	$ 7