Related Party Transactions (Transactions with NEXUS) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Operating Revenues — Utility operations	$ 6,845	$ 6,638	$ 6,670
Fuel, purchased power, and gas — utility	1,719	1,798	1,981
Fuel, purchased power, gas, and other — non-utility	4,141	5,053	6,630
DTE Electric
Related Party Transaction [Line Items]
Operating Revenues — Utility operations	5,506	5,224	5,298
Fuel, purchased power, and gas — utility	1,397	1,390	1,552
NEXUS | Equity Method Investee | DTE Gas
Related Party Transaction [Line Items]
Operating Revenues — Utility operations	32	32	6
Fuel, purchased power, and gas — utility	21	22	1
NEXUS | Equity Method Investee | DTE Electric
Related Party Transaction [Line Items]
Fuel, purchased power, and gas — utility	8	8	1
NEXUS | Equity Method Investee | DTE Energy Trading
Related Party Transaction [Line Items]
Fuel, purchased power, gas, and other — non-utility	$ 27	$ 13	$ 1
NEXUS | Capacity Lease Agreement | DTE Gas
Related Party Transaction [Line Items]
Term of agreement	15 years
NEXUS | Service Agreement | DTE Gas
Related Party Transaction [Line Items]
Term of agreement	15 years
NEXUS | Service Agreement | DTE Electric
Related Party Transaction [Line Items]
Term of agreement	20 years