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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, 2020
Dec. 31, 2019
Restricted Stock Awards And Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested at December 31, 2018 4,984,000  
Granted, awards and units 3,056,000  
Vested, awards and units (2,388,000)  
Forfeited, awards and units (336,000)  
Unvested at December 31, 2019 5,316,000 4,984,000
Unvested weighted average grant-date fair value at December 31, 2018 $ 29.65  
Granted, weighted average grant-date fair value 21.90  
Vested, weighted average grant-date fair value 28.96  
Forfeited, weighted average grant-date fair value 24.52  
Unvested weighted average grant-date fair value at December 31, 2019 $ 25.82 $ 29.65
Performance-Based Restricted Stock Awards [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested at December 31, 2018 153,000  
Granted, awards and units 0 0
Vested, awards and units (109,000)  
Unvested at December 31, 2019 44,000 153,000
Unvested weighted average grant-date fair value at December 31, 2018 $ 33.88  
Vested, weighted average grant-date fair value 29.51  
Unvested weighted average grant-date fair value at December 31, 2019 $ 44.70 $ 33.88
Performance Share Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested at December 31, 2018 2,155,000  
Granted, awards and units 688,000  
Vested, awards and units (455,000)  
Forfeited, awards and units (394,000)  
Unvested at December 31, 2019 1,994,000 [1] 2,155,000
Unvested weighted average grant-date fair value at December 31, 2018 $ 40.35  
Granted, weighted average grant-date fair value 27.89  
Vested, weighted average grant-date fair value 52.56  
Forfeited, weighted average grant-date fair value 47.30  
Unvested weighted average grant-date fair value at December 31, 2019 $ 31.89 $ 40.35
[1] A maximum of 3.2 million common shares could be awarded based upon Devon’s final TSR ranking.