Related Party Transactions (Schedule of Related Party Transactions) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction [Line Items]
Operating Revenues — Utility operations	$ 1,542	$ 1,417	$ 3,275	$ 3,281
Fuel, purchased power, and gas — utility	374	360	841	942
Fuel, purchased power, and gas — non-utility	789	1,258	1,757	2,643
DTE Electric
Related Party Transaction [Line Items]
Operating Revenues — Utility operations	1,309	1,190	2,521	2,425
Fuel, purchased power, and gas — utility	342	322	639	668
NEXUS | DTE Gas | Equity Method Investee
Related Party Transaction [Line Items]
Operating Revenues — Utility operations	8	8	16	16
Fuel, purchased power, and gas — utility	6	6	12	13
NEXUS | DTE Electric | Equity Method Investee
Related Party Transaction [Line Items]
Fuel, purchased power, and gas — utility	2	2	4	4
NEXUS | DTE Energy Trading | Equity Method Investee
Related Party Transaction [Line Items]
Fuel, purchased power, and gas — non-utility	$ 6	$ 1	$ 13	$ 3