Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)	3 Months Ended			9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)		$ (19,000,000)	$ 8,000,000	$ (50,000,000)	$ 22,000,000
Pension plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, current fiscal year		0		0
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)		(9,000,000)	(17,000,000)	(28,000,000)	(50,000,000)
Anticipated contributions, current fiscal year		0		0
DTE Electric | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)		(12,000,000)	9,000,000	(28,000,000)	27,000,000
DTE Electric | Pension plans | Qualified Plan | Maximum | Forecast
Defined Benefit Plan Disclosure [Line Items]
Pension funds transferred to (from) plan	$ 50,000,000
DTE Electric | Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Pension cost (credit)		$ (6,000,000)	$ (9,000,000)	$ (18,000,000)	$ (27,000,000)
DTE Gas | Pension plans | Qualified Plan | Maximum | Forecast
Defined Benefit Plan Disclosure [Line Items]
Pension funds transferred to (from) plan	$ (50,000,000)