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Supplemental Information On Oil And Gas Operations (Results Of Operations) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |
Oil, gas and NGL sales |  | $ 9,910 us-gaap_OilAndGasSalesRevenue | $ 8,522 us-gaap_OilAndGasSalesRevenue | $ 7,153 us-gaap_OilAndGasSalesRevenue
Lease operating expenses |  | (2,332)us-gaap_LeaseOperatingExpense | (2,268)us-gaap_LeaseOperatingExpense | (2,074)us-gaap_LeaseOperatingExpense
General and administrative expenses |  | (210)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities | (202)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities | (296)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities
Production and property taxes |  | (503)us-gaap_ResultsOfOperationsExpenseOther | (439)us-gaap_ResultsOfOperationsExpenseOther | (395)us-gaap_ResultsOfOperationsExpenseOther
Depreciation, depletion and amortization |  | (2,896)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion | (2,465)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion | (2,526)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion
Gain on sale of assets |  | 1,077 dvn_ResultsOfOperationsGainOnSaleOfAssets |  |
Asset impairments |  |  | (1,953)us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties | (1,956)us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
Accretion of asset retirement obligations |  | (88)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations | (111)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations | (109)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations
Income tax benefit (expense) |  | (1,767)us-gaap_ResultsOfOperationsIncomeTaxExpense | (422)us-gaap_ResultsOfOperationsIncomeTaxExpense | 96 us-gaap_ResultsOfOperationsIncomeTaxExpense
Results of operations |  | 3,191 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | 662 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | (107)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts
Depreciation, depletion and amortization per Boe |  | 11.79 dvn_DepreciationDepletionAndAmortizationPerBoe | 9.75 dvn_DepreciationDepletionAndAmortizationPerBoe | 10.12 dvn_DepreciationDepletionAndAmortizationPerBoe
Goodwill impairments |  | 1,941 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
United States [Member] |  |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |
Oil, gas and NGL sales |  | 7,867 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_US | 5,964 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_US | 4,679 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_US
Lease operating expenses |  | (1,559)us-gaap_LeaseOperatingExpense / us-gaap_StatementGeographicalAxis = country_US | (1,257)us-gaap_LeaseOperatingExpense / us-gaap_StatementGeographicalAxis = country_US | (1,059)us-gaap_LeaseOperatingExpense / us-gaap_StatementGeographicalAxis = country_US
General and administrative expenses |  | (153)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_US | (125)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_US | (159)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_US
Production and property taxes |  | (466)us-gaap_ResultsOfOperationsExpenseOther / us-gaap_StatementGeographicalAxis = country_US | (380)us-gaap_ResultsOfOperationsExpenseOther / us-gaap_StatementGeographicalAxis = country_US | (340)us-gaap_ResultsOfOperationsExpenseOther / us-gaap_StatementGeographicalAxis = country_US
Depreciation, depletion and amortization |  | (2,365)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion / us-gaap_StatementGeographicalAxis = country_US | (1,640)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion / us-gaap_StatementGeographicalAxis = country_US | (1,563)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion / us-gaap_StatementGeographicalAxis = country_US
Asset impairments |  |  | (1,110)us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US | (1,793)us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US
Accretion of asset retirement obligations |  | (49)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations / us-gaap_StatementGeographicalAxis = country_US | (47)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations / us-gaap_StatementGeographicalAxis = country_US | (40)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations / us-gaap_StatementGeographicalAxis = country_US
Income tax benefit (expense) |  | (1,199)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_US | (510)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_US | 99 us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_US
Results of operations |  | 2,076 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_US | 895 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_US | (176)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_US
Depreciation, depletion and amortization per Boe |  | 11.41 dvn_DepreciationDepletionAndAmortizationPerBoe / us-gaap_StatementGeographicalAxis = country_US | 8.69 dvn_DepreciationDepletionAndAmortizationPerBoe / us-gaap_StatementGeographicalAxis = country_US | 8.55 dvn_DepreciationDepletionAndAmortizationPerBoe / us-gaap_StatementGeographicalAxis = country_US
Canada [Member] |  |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |
Oil, gas and NGL sales |  | 2,043 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_CA | 2,558 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_CA | 2,474 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_CA
Lease operating expenses |  | (773)us-gaap_LeaseOperatingExpense / us-gaap_StatementGeographicalAxis = country_CA | (1,011)us-gaap_LeaseOperatingExpense / us-gaap_StatementGeographicalAxis = country_CA | (1,015)us-gaap_LeaseOperatingExpense / us-gaap_StatementGeographicalAxis = country_CA
General and administrative expenses |  | (57)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_CA | (77)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_CA | (137)us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_CA
Production and property taxes |  | (37)us-gaap_ResultsOfOperationsExpenseOther / us-gaap_StatementGeographicalAxis = country_CA | (59)us-gaap_ResultsOfOperationsExpenseOther / us-gaap_StatementGeographicalAxis = country_CA | (55)us-gaap_ResultsOfOperationsExpenseOther / us-gaap_StatementGeographicalAxis = country_CA
Depreciation, depletion and amortization |  | (531)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion / us-gaap_StatementGeographicalAxis = country_CA | (825)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion / us-gaap_StatementGeographicalAxis = country_CA | (963)us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion / us-gaap_StatementGeographicalAxis = country_CA
Gain on sale of assets |  | 1,077 dvn_ResultsOfOperationsGainOnSaleOfAssets / us-gaap_StatementGeographicalAxis = country_CA |  |
Asset impairments |  |  | (843)us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA | (163)us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA
Accretion of asset retirement obligations |  | (39)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations / us-gaap_StatementGeographicalAxis = country_CA | (64)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations / us-gaap_StatementGeographicalAxis = country_CA | (69)us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations / us-gaap_StatementGeographicalAxis = country_CA
Income tax benefit (expense) |  | (568)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_CA | 88 us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_CA | (3)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_CA
Results of operations |  | 1,115 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_CA | (233)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_CA | 69 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_CA
Depreciation, depletion and amortization per Boe |  | 13.80 dvn_DepreciationDepletionAndAmortizationPerBoe / us-gaap_StatementGeographicalAxis = country_CA | 12.87 dvn_DepreciationDepletionAndAmortizationPerBoe / us-gaap_StatementGeographicalAxis = country_CA | 14.41 dvn_DepreciationDepletionAndAmortizationPerBoe / us-gaap_StatementGeographicalAxis = country_CA
Goodwill impairments | $ 1,900 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementGeographicalAxis = country_CA |  |  |

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