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Other Comprehensive Earnings (loss) (Components Of Other Comprehensive Earnings (loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Foreign currency translation:      
Beginning accumulated foreign currency translation and other     $ 1,159
Change in cumulative translation adjustment     78
Release of Canadian cumulative translation adjustment [1]     (1,237)
Pension and postretirement benefit plans:      
Beginning accumulated pension and postretirement benefits $ (127) $ (119) (132)
Net actuarial loss and prior service cost arising in current year (35) (34) (10)
Recognition of net actuarial loss and prior service cost in earnings [2] 3 7 6
Curtailment and settlement of pension benefits [3] 19 16 21
Other [4] 7    
Income tax benefit (expense) 1 3 (4)
Accumulated other comprehensive loss, net of tax $ (132) $ (127) $ (119)
[1] In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.
[2] These accumulated other comprehensive earnings components are included in the computation of net periodic benefit cost, which is a component of other, net in the accompanying consolidated statements of comprehensive earnings. See Note 17 for additional details.
[3] In 2021, the Merger triggered settlement payments to certain plan participants, and the expense associated with this settlement is recognized as a component of restructuring and transaction costs in the accompanying consolidated statements of comprehensive earnings.  
[4] Other includes a remeasurement of the pension obligation due to the Merger, which was partially offset by a change in mortality assumption.