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Other Comprehensive Earnings (Loss) (Components Of Other Comprehensive Earnings (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Foreign currency translation:          
Beginning accumulated foreign currency translation and other $ 1,194 $ 1,261 $ 1,159 $ 1,309  
Change in cumulative translation adjustment 43 (36) 78 (96)  
Release of Canadian cumulative translation adjustment [1] (1,237)   (1,237)    
Income tax benefit   2   14  
Ending accumulated foreign currency translation   1,227   1,227  
Pension and postretirement benefit plans:          
Beginning accumulated pension and postretirement benefits (130) (139) (132) (143)  
Recognition of net actuarial loss and prior service cost in earnings [2] 17 3 20 7  
Income tax expense (4)   (5)    
Ending accumulated pension and postretirement benefits (117) (136) (117) (136)  
Accumulated other comprehensive earnings (loss), net of tax $ (117) $ 1,091 $ (117) $ 1,091 $ 1,027
[1] In conjunction with the sale of all of its Canadian operating assets, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 18 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 expenses in the accompanying consolidated comprehensive statements of earnings. See Note 16 for additional details.