Long-Term Debt (Schedule of Debt Redeemed) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Debt Instrument, Redemption [Line Items]
Debt redeemed	$ 682
DTE Electric | Senior Notes | 4.89% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest rate	4.89%
Debt redeemed	$ 300
DTE Electric | Senior Notes | 5.63% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest rate	5.63%
Debt redeemed	$ 32
DTE Electric | Senior Notes | 3.45% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest rate	3.45%
Debt redeemed	$ 300
DTE Electric | Senior Notes | 6.36% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest rate	6.36%
Debt redeemed	$ 50