Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 684	$ 1,197
Derivative Liabilities	(622)	(1,172)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	479	910
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(411)	(847)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	205	287
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(211)	(325)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(11)	(16)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(1)	(3)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	399	637
Derivative Liabilities	(377)	(615)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	191	421
Derivative Liabilities	(171)	(388)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	93	139
Derivative Liabilities	(62)	(150)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(12)	(18)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(11)	(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	683	1,197
Derivative Liabilities	(610)	(1,154)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	0	(1)
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	399	637
Derivative Liabilities	(377)	(615)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	191	421
Derivative Liabilities	(171)	(388)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	93	139
Derivative Liabilities	(62)	(150)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 21	$ 7