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Retirement Benefits and Trusteed Assets (Details Textuals) - Pension plans - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Pension credit		$ (14)	$ 5	$ (45)	$ 14
DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Pension credit		$ 12	$ 1	$ 39	$ 4
DTE Electric | Forecast
Defined Benefit Plan Disclosure [Line Items]
Pension funds transferred to (from) plan (up to)	$ 25
DTE Gas | Forecast
Defined Benefit Plan Disclosure [Line Items]
Pension funds transferred to (from) plan (up to)	$ (25)

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