Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 775	$ 663
Derivative Liabilities	(770)	(669)
Current derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	646	563
Noncurrent derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	129	100
Current derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(596)	(518)
Noncurrent derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(174)	(151)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	(3)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	355	349
Derivative Liabilities	(351)	(380)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	306	303
Derivative Liabilities	(298)	(285)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	113	7
Derivative Liabilities	(121)	(1)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	4
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	0	(3)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	775	663
Derivative Liabilities	(770)	(666)
Derivatives not designated as hedging instruments | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	3	6
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	355	349
Derivative Liabilities	(351)	(380)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	306	303
Derivative Liabilities	(298)	(285)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	113	7
Derivative Liabilities	(121)	(1)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	4
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | FTRs — Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 3	$ 6