Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 1,239	$ 1,922
Derivative Liabilities	(1,357)	(2,169)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	951	1,517
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(920)	(1,535)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	288	405
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(437)	(634)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	1
Derivative Liabilities	(5)	0
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	2	1
Derivative Liabilities	(3)	(2)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	500	744
Derivative Liabilities	(589)	(1,018)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	510	963
Derivative Liabilities	(521)	(935)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	226	213
Derivative Liabilities	(239)	(214)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	1	1
Derivative Liabilities	(7)	(2)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	1
Derivative Liabilities	(5)	0
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(2)	(2)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	1,238	1,921
Derivative Liabilities	(1,350)	(2,167)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	2	1
Derivative Liabilities	(1)	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	500	744
Derivative Liabilities	(589)	(1,018)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	510	963
Derivative Liabilities	(521)	(935)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	226	213
Derivative Liabilities	(239)	(214)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 1	$ 11