Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 837	$ 694
Derivative Liabilities	(758)	(605)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	607	488
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(546)	(441)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	230	206
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(212)	(164)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	20
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	1
Derivative Liabilities	(1)	(1)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	461	428
Derivative Liabilities	(395)	(410)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	304	187
Derivative Liabilities	(310)	(150)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	68	58
Derivative Liabilities	(52)	(44)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	3	20
Derivative Liabilities	(1)	(1)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	20
Derivative Liabilities	0	0
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(1)	(1)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	834	674
Derivative Liabilities	(757)	(604)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	1
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	461	428
Derivative Liabilities	(395)	(410)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	304	187
Derivative Liabilities	(310)	(150)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	68	58
Derivative Liabilities	(52)	(44)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 3	$ 9