Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)	$ 18	$ 15
Contributions by employer	0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)	(11)	(10)
Contributions by employer	0
DTE Electric | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)	15	14
Pension funds transferred to (from) plan (up to)	25		$ 25
DTE Electric | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)	(7)	$ (5)
DTE Gas | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension funds transferred to (from) plan (up to)	$ (25)		$ (25)