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Supplemental Information On Oil And Gas Operations (Proved Undeveloped Reserves) (Details)
 12 Months Ended
Dec. 31, 2014
MMBoe
Dec. 31, 2012
MMBoe
Dec. 31, 2011
MMBoe
Reserve Quantities [Line Items]      
Proved undeveloped reserve (MMBOE) beginning balance 701us-gaap_ProvedUndevelopedReserveBOE1 [1] 840us-gaap_ProvedUndevelopedReserveBOE1 [1] 782us-gaap_ProvedUndevelopedReserveBOE1 [1]
Proved undeveloped reserves, extensions and discoveries 161dvn_ProvedUndevelopedReservesExtensionsAndDiscoveriesEnergy    
Proved undeveloped reserves, revisions due to prices (35)dvn_ProvedUndevelopedReservesRevisionsDueToPricesEnergy    
Proved undeveloped reserves, revisions other than price (43)dvn_ProvedUndevelopedReservesRevisionsOtherThanPriceEnergy    
Proved Undeveloped Reserves, Sale of reserves (6)dvn_ProvedUndevelopedReservesSaleOfReserves    
Proved undeveloped reserves, conversion to proved developed reserves (89)dvn_ProvedUndevelopedReservesConversionToProvedDevelopedReservesEnergy    
Proved undeveloped reserve (MMBOE) ending balance 689us-gaap_ProvedUndevelopedReserveBOE1 [1] 840us-gaap_ProvedUndevelopedReserveBOE1 [1] 782us-gaap_ProvedUndevelopedReserveBOE1 [1]
United States [Member]      
Reserve Quantities [Line Items]      
Proved undeveloped reserve (MMBOE) beginning balance 258us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_US		 [1] 407us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_US		 [1] 403us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_US		 [1]
Proved undeveloped reserves, extensions and discoveries 153dvn_ProvedUndevelopedReservesExtensionsAndDiscoveriesEnergy
/ us-gaap_StatementGeographicalAxis
= country_US		    
Proved undeveloped reserves, revisions due to prices (1)dvn_ProvedUndevelopedReservesRevisionsDueToPricesEnergy
/ us-gaap_StatementGeographicalAxis
= country_US		    
Proved undeveloped reserves, revisions other than price (61)dvn_ProvedUndevelopedReservesRevisionsOtherThanPriceEnergy
/ us-gaap_StatementGeographicalAxis
= country_US		    
Proved Undeveloped Reserves, Sale of reserves (4)dvn_ProvedUndevelopedReservesSaleOfReserves
/ us-gaap_StatementGeographicalAxis
= country_US		    
Proved undeveloped reserves, conversion to proved developed reserves (40)dvn_ProvedUndevelopedReservesConversionToProvedDevelopedReservesEnergy
/ us-gaap_StatementGeographicalAxis
= country_US		    
Proved undeveloped reserve (MMBOE) ending balance 305us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_US		 [1] 407us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_US		 [1] 403us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_US		 [1]
Canada [Member]      
Reserve Quantities [Line Items]      
Proved undeveloped reserve (MMBOE) beginning balance 443us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_CA		 [1] 433us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_CA		 [1] 379us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_CA		 [1]
Proved undeveloped reserves, extensions and discoveries 8dvn_ProvedUndevelopedReservesExtensionsAndDiscoveriesEnergy
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Proved undeveloped reserves, revisions due to prices (34)dvn_ProvedUndevelopedReservesRevisionsDueToPricesEnergy
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Proved undeveloped reserves, revisions other than price 18dvn_ProvedUndevelopedReservesRevisionsOtherThanPriceEnergy
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Proved Undeveloped Reserves, Sale of reserves (2)dvn_ProvedUndevelopedReservesSaleOfReserves
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Proved undeveloped reserves, conversion to proved developed reserves (49)dvn_ProvedUndevelopedReservesConversionToProvedDevelopedReservesEnergy
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Proved undeveloped reserve (MMBOE) ending balance 384us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_CA		 [1] 433us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_CA		 [1] 379us-gaap_ProvedUndevelopedReserveBOE1
/ us-gaap_StatementGeographicalAxis
= country_CA		 [1]
[1] Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. This rate is not necessarily indicative of the relationship of natural gas and oil prices. Bitumen and natural gas liquids reserves are converted to Boe on a one-to-one basis with oil.