Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 2,377	$ 1,391
Derivative Liabilities	(2,562)	(1,508)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,876	1,035
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(1,868)	(1,037)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	501	356
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(694)	(471)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(6)	(4)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	711	454
Derivative Liabilities	(905)	(594)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	1,334	643
Derivative Liabilities	(1,325)	(622)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	332	294
Derivative Liabilities	(326)	(288)
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(4)	(4)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	2,377	1,391
Derivative Liabilities	(2,558)	(1,504)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(2)	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	711	454
Derivative Liabilities	(905)	(594)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	1,334	643
Derivative Liabilities	(1,325)	(622)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	332	294
Derivative Liabilities	(326)	(288)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 3	$ 9