Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 3,229	$ 1,391
Derivative Liabilities	(3,530)	(1,508)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	2,583	1,035
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(2,653)	(1,037)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	646	356
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(877)	(471)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(3)	(4)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	902	454
Derivative Liabilities	(1,266)	(594)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	1,960	643
Derivative Liabilities	(1,918)	(622)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	367	294
Derivative Liabilities	(343)	(288)
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(3)	(4)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	3,229	1,391
Derivative Liabilities	(3,527)	(1,504)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	902	454
Derivative Liabilities	(1,266)	(594)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	1,960	643
Derivative Liabilities	(1,918)	(622)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	367	294
Derivative Liabilities	(343)	(288)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 25	$ 9