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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]    
Deferred tax assets, asset retirement obligations $ 458us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations $ 673us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Deferred tax assets, foreign tax credits   248us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Deferred tax assets, net operating loss carryforwards 200us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 183us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets, alternative minimum tax credits 57us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 105us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred tax assets, pension benefit obligations 113us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 104us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Deferred tax assets, other 273us-gaap_DeferredTaxAssetsOther 163us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,101us-gaap_DeferredTaxAssetsNet 1,476us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities, property and equipment (6,940)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (5,895)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred tax liabilities, long-term debt (115)dvn_DeferredTaxLiabilitiesLongTermDebt (161)dvn_DeferredTaxLiabilitiesLongTermDebt
Deferred tax liabilities, taxes on unremitted foreign earnings (6)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (157)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Deferred tax liabilities, fair value of financial instruments (699)us-gaap_DeferredTaxLiabilitiesDerivatives (7)us-gaap_DeferredTaxLiabilitiesDerivatives
Deferred tax liabilities, other (154)us-gaap_DeferredTaxLiabilitiesOther (52)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (7,914)us-gaap_DeferredTaxLiabilities (6,272)us-gaap_DeferredTaxLiabilities
Net deferred tax liability $ (6,813)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (4,796)us-gaap_DeferredTaxAssetsLiabilitiesNet