Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 703	$ 775
Derivative Liabilities	(640)	(770)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	531	646
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(478)	(596)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	172	129
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(162)	(174)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	250	355
Derivative Liabilities	(226)	(351)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	223	306
Derivative Liabilities	(211)	(298)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	227	113
Derivative Liabilities	(202)	(121)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	1
Derivative Liabilities	(1)	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	703	775
Derivative Liabilities	(640)	(770)
Derivatives not designated as hedging instruments | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	10	3
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	250	355
Derivative Liabilities	(226)	(351)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	223	306
Derivative Liabilities	(211)	(298)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	227	113
Derivative Liabilities	(202)	(121)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	1
Derivative Liabilities	(1)	0
Derivatives not designated as hedging instruments | FTRs — Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 10	$ 3