Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 891	$ 1,197
Derivative Liabilities	(935)	(1,172)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	658	910
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(642)	(847)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	233	287
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(293)	(325)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	10	0
Derivative Liabilities	0	(16)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(1)	(3)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	499	637
Derivative Liabilities	(506)	(615)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	235	421
Derivative Liabilities	(267)	(388)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	146	139
Derivative Liabilities	(161)	(150)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	10	0
Derivative Liabilities	(1)	(18)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	10	0
Derivative Liabilities	0	(16)
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(1)	(2)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	881	1,197
Derivative Liabilities	(934)	(1,154)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	0	(1)
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	499	637
Derivative Liabilities	(506)	(615)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	235	421
Derivative Liabilities	(267)	(388)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	146	139
Derivative Liabilities	(161)	(150)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 3	$ 7