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Supplemental Information On Oil And Gas Operations (Schedule Of Principal Changes In The Standardized Measure Of Discounted Future Net Cash Flows Attributable To Proved Reserves) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental Information On Oil And Gas Operations [Abstract] |  |  |
Standardized measure of discounted future net cash flows, beginning balance | $ 15,741 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 13,221 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 17,844 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Net changes in prices and production costs | 2,561 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts | 3,018 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts | (9,889)us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
Oil, bitumen, gas and NGL sales, net of production costs | (6,865)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts | (5,613)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts | (4,388)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts
Changes in estimated future development costs | (768)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts | 399 us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts | (1,094)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts
Extensions and discoveries, net of future development costs | 4,836 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts | 4,047 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts | 4,669 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
Purchase of reserves | 6,422 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace | 14 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace | 18 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace
Sale of reserves in place | (2,384)us-gaap_DecreaseDueToSalesOfMineralsInPlace | (44)us-gaap_DecreaseDueToSalesOfMineralsInPlace | (25)us-gaap_DecreaseDueToSalesOfMineralsInPlace
Revisions of quantity estimates | (746)us-gaap_RevisionsOfPreviousQuantityEstimates | (1,040)us-gaap_RevisionsOfPreviousQuantityEstimates | 162 us-gaap_RevisionsOfPreviousQuantityEstimates
Previously estimated development costs incurred during the period | 1,933 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod | 1,986 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod | 1,321 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod
Accretion of discount | 1,746 us-gaap_AccretionOfDiscount | 1,940 us-gaap_AccretionOfDiscount | 1,420 us-gaap_AccretionOfDiscount
Other, primarily changes in timing and foreign exchange rates | (107)dvn_OtherPrimarilyChangesInTimingAndForeignExchangeRates | (583)dvn_OtherPrimarilyChangesInTimingAndForeignExchangeRates | 113 dvn_OtherPrimarilyChangesInTimingAndForeignExchangeRates
Net change in income taxes | (1,895)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves | (1,604)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves | 3,070 us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
Standardized measure of discounted future net cash flows, ending balance | $ 20,474 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 15,741 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 13,221 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

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