Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 1,356	$ 1,922
Derivative Liabilities	(1,429)	(2,169)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	955	1,517
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(918)	(1,535)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	401	405
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(511)	(634)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	4	1
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(2)	(2)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	501	744
Derivative Liabilities	(583)	(1,018)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	497	963
Derivative Liabilities	(487)	(935)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	354	213
Derivative Liabilities	(357)	(214)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	4	1
Derivative Liabilities	(2)	(2)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	4	1
Derivative Liabilities	0	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	1,352	1,921
Derivative Liabilities	(1,427)	(2,167)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	501	744
Derivative Liabilities	(583)	(1,018)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	497	963
Derivative Liabilities	(487)	(935)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	354	213
Derivative Liabilities	(357)	(214)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 14	$ 11