Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 1,197	$ 1,922
Derivative Liabilities	(1,172)	(2,169)
Current derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	910	1,517
Noncurrent derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	287	405
Current derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(847)	(1,535)
Noncurrent derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(325)	(634)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(16)	0
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(3)	(2)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	637	744
Derivative Liabilities	(615)	(1,018)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	421	963
Derivative Liabilities	(388)	(935)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	139	213
Derivative Liabilities	(150)	(214)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(18)	(2)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(16)	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	1,197	1,921
Derivative Liabilities	(1,154)	(2,167)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(1)	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	637	744
Derivative Liabilities	(615)	(1,018)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	421	963
Derivative Liabilities	(388)	(935)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	139	213
Derivative Liabilities	(150)	(214)
Derivatives not designated as hedging instruments | Derivative assets — FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 7	$ 11