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Income Taxes (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax [Line Items] |  |  |  |
Current income tax expense (benefit) |  | $ 477,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit | $ 72,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit | $ 52,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Current income tax expense (benefit) on repatriation after foreign tax credits |  | 67,000,000 dvn_CurrentIncomeTaxExpenseBenefitAfterForeignTaxCredits |  |
Foreign earnings repatriated | 2,800,000,000 us-gaap_ForeignEarningsRepatriated | 2,800,000,000 us-gaap_ForeignEarningsRepatriated | 4,300,000,000 us-gaap_ForeignEarningsRepatriated |
Deferred income tax expense (benefit) |  | 1,891,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 97,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit | (184,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred tax liabilities, taxes on unremitted foreign earnings |  | 6,000,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | 157,000,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |
Deferred tax liability on formation of EnLink |  | 154,000,000 us-gaap_DeferredTaxLiabilitiesOther | 52,000,000 us-gaap_DeferredTaxLiabilitiesOther |
Income tax expense (benefit) |  | 2,368,000,000 us-gaap_IncomeTaxExpenseBenefit | 169,000,000 us-gaap_IncomeTaxExpenseBenefit | (132,000,000)us-gaap_IncomeTaxExpenseBenefit
Unremitted foreign earnings |  | 1,800,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Unremitted earnings from subsidiaries not to be permanently reinvested |  | 22,000,000 dvn_UnremittedEarningsFromSubsidiariesNotToBePermanentlyReinvested |  |
Deferred tax assets, net operating loss carryforwards |  | 200,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 183,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Deferred tax assets, foreign tax credits |  |  | 248,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Deferred tax assets, alternative minimum tax credits |  | 57,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 105,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |
Unrecognized tax benefits, interest and penalties |  | 34,000,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 32,000,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Unrecognized tax benefit that would impact effective tax rate |  | 223,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Tax Scenario One [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | (83,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_ScenarioOneMember |
Tax Scenario Two [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | (180,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_ScenarioTwoMember |
Tax Scenario Three [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | 97,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_ScenarioThreeMember |
Assumed Repatriations Of Foreign Earnings [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred tax liabilities, taxes on unremitted foreign earnings |  | 143,000,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings / us-gaap_StatementScenarioAxis = dvn_AssumedRepatriationsOfForeignEarningsMember |  |
Repatriated Foreign Earnings [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Current income tax expense (benefit) |  | 105,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_RepatriatedEarningsMember | 180,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_RepatriatedEarningsMember |
Deferred income tax expense (benefit) |  |  | (83,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_RepatriatedEarningsMember |
Income tax expense (benefit) |  |  | 97,000,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = dvn_RepatriatedEarningsMember |
Canada Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred tax assets, Canadian net operating loss carryforward |  | 621,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Various U.S. States [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred tax assets, State net operating loss carryforward |  | 180,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Minimum [Member] | Canada Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating loss carryforward, expiration date |  | Dec. 31, 2029 |  |
Operating loss carryforward, utilization period |  | Dec. 31, 2015 |  |
Minimum [Member] | Various U.S. States [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating loss carryforward, expiration date |  | Dec. 31, 2018 |  |
Operating loss carryforward, utilization period |  | Dec. 31, 2017 |  |
Maximum [Member] | Canada Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating loss carryforward, expiration date |  | Dec. 31, 2034 |  |
Operating loss carryforward, utilization period |  | Dec. 31, 2017 |  |
Maximum [Member] | Various U.S. States [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating loss carryforward, expiration date |  | Dec. 31, 2032 |  |
Operating loss carryforward, utilization period |  | Dec. 31, 2029 |  |
U.S. Asset Divestiture [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Current income tax expense (benefit) |  | 294,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = dvn_U.s.NonCoreAssetDivestitureMember |  |
EnLink [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred tax liability on formation of EnLink |  | 46,000,000 us-gaap_DeferredTaxLiabilitiesOther / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dvn_EnlinkMember |  |
Deferred tax assets, net operating loss carryforwards |  | $ 135,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dvn_EnlinkMember |  |
Operating loss carryforward, utilization period |  | Dec. 31, 2015 |  |
EnLink [Member] | Minimum [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating loss carryforward, expiration date |  | Dec. 31, 2028 |  |
EnLink [Member] | Maximum [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating loss carryforward, expiration date |  | Dec. 31, 2034 |  |

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