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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
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 $ 15,741us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 13,221us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 17,844us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Net changes in prices and production costs 2,561us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts 3,018us-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 399us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts (1,094)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts
Extensions and discoveries, net of future development costs 4,836us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts 4,047us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts 4,669us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
Purchase of reserves 6,422us-gaap_IncreaseDueToPurchasesOfMineralsInPlace 14us-gaap_IncreaseDueToPurchasesOfMineralsInPlace 18us-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 162us-gaap_RevisionsOfPreviousQuantityEstimates
Previously estimated development costs incurred during the period 1,933us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod 1,986us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod 1,321us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod
Accretion of discount 1,746us-gaap_AccretionOfDiscount 1,940us-gaap_AccretionOfDiscount 1,420us-gaap_AccretionOfDiscount
Other, primarily changes in timing and foreign exchange rates (107)dvn_OtherPrimarilyChangesInTimingAndForeignExchangeRates (583)dvn_OtherPrimarilyChangesInTimingAndForeignExchangeRates 113dvn_OtherPrimarilyChangesInTimingAndForeignExchangeRates
Net change in income taxes (1,895)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves (1,604)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves 3,070us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
Standardized measure of discounted future net cash flows, ending balance $ 20,474us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 15,741us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 13,221us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves