Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 861	$ 1,197
Derivative Liabilities	(832)	(1,172)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	601	910
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(548)	(847)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	260	287
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(284)	(325)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	6	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	421	637
Derivative Liabilities	(412)	(615)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	255	421
Derivative Liabilities	(251)	(388)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	178	139
Derivative Liabilities	(168)	(150)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	6	0
Derivative Liabilities	(1)	(18)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	6	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	855	1,197
Derivative Liabilities	(831)	(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	421	637
Derivative Liabilities	(412)	(615)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	255	421
Derivative Liabilities	(251)	(388)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	178	139
Derivative Liabilities	(168)	(150)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 28	$ 7