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Supplemental Information On Oil And Gas Operations (Proved Undeveloped Reserves) (Details) | 12 Months Ended |  |
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Dec. 31, 2014 MMBoe | Dec. 31, 2012 MMBoe | Dec. 31, 2011 MMBoe
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved undeveloped reserve (MMBOE) beginning balance | 701 us-gaap_ProvedUndevelopedReserveBOE1 | [1] | 840 us-gaap_ProvedUndevelopedReserveBOE1 | [1] | 782 us-gaap_ProvedUndevelopedReserveBOE1 | [1]
Proved undeveloped reserves, extensions and discoveries | 161 dvn_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 | 689 us-gaap_ProvedUndevelopedReserveBOE1 | [1] | 840 us-gaap_ProvedUndevelopedReserveBOE1 | [1] | 782 us-gaap_ProvedUndevelopedReserveBOE1 | [1]
United States [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved undeveloped reserve (MMBOE) beginning balance | 258 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US | [1] | 407 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US | [1] | 403 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US | [1]
Proved undeveloped reserves, extensions and discoveries | 153 dvn_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 | 305 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US | [1] | 407 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US | [1] | 403 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US | [1]
Canada [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved undeveloped reserve (MMBOE) beginning balance | 443 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA | [1] | 433 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA | [1] | 379 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA | [1]
Proved undeveloped reserves, extensions and discoveries | 8 dvn_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 | 18 dvn_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 | 384 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA | [1] | 433 us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA | [1] | 379 us-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.

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