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Other Comprehensive Earnings (Loss) (Components Of Other Comprehensive Earnings (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Foreign currency translation:          
Beginning accumulated foreign currency translation and other   $ 1,194   $ 1,159 $ 1,159
Change in cumulative translation adjustment   43   78  
Release of Canadian cumulative translation adjustment [1]   (1,237)   (1,237)  
Pension and postretirement benefit plans:          
Beginning accumulated pension and postretirement benefits $ (118) (130) $ (119) (132) (132)
Recognition of net actuarial loss and prior service cost in earnings [2] 1 17 3 20  
Income tax expense   (4) (1) (5)  
Ending accumulated pension and postretirement benefits (117) (117) (117) (117) (119)
Accumulated other comprehensive loss, net of tax $ (117) $ (117) $ (117) $ (117) $ (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 17 for additional details.
[2] These accumulated other comprehensive earnings (loss) components are included in the computation of net periodic benefit cost, which is a component of other expenses in the accompanying consolidated statements of comprehensive earnings.