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Share-Based Compensation (Summary Of Unvested Restricted Stock Awards and Units, Performance-Based Restricted Stock Awards And Performance Share Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Awards And Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested at December 31, 2018 5,963,000  
Granted, awards and units 4,430,000  
Vested, awards and units (4,646,000)  
Forfeited, awards and units (763,000)  
Unvested at December 31, 2019 4,984,000 5,963,000
Unvested weighted average grant-date fair value at December 31, 2018 $ 35.47  
Granted, weighted average grant-date fair value 25.47  
Vested, weighted average grant-date fair value 33.48  
Forfeited, weighted average grant-date fair value 27.50  
Unvested weighted average grant-date fair value at December 31, 2019 $ 29.65 $ 35.47
Performance-Based Restricted Stock Awards [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested at December 31, 2018 302,000  
Granted, awards and units 0 0
Vested, awards and units (149,000)  
Unvested at December 31, 2019 153,000 302,000
Unvested weighted average grant-date fair value at December 31, 2018 $ 35.93  
Vested, weighted average grant-date fair value 38.03  
Unvested weighted average grant-date fair value at December 31, 2019 $ 33.88 $ 35.93
Performance Share Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested at December 31, 2018 2,868,000  
Granted, awards and units 741,000  
Vested, awards and units (145,000)  
Forfeited, awards and units (1,309,000)  
Unvested at December 31, 2019 2,155,000 [1] 2,868,000
Unvested weighted average grant-date fair value at December 31, 2018 $ 30.14  
Granted, weighted average grant-date fair value 28.97  
Vested, weighted average grant-date fair value 37.23  
Forfeited, weighted average grant-date fair value 11.91  
Unvested weighted average grant-date fair value at December 31, 2019 $ 40.35 $ 30.14
[1] A maximum of 4.3 million common shares could be awarded based upon Devon’s final TSR ranking.