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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)   $ 477,000,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 72,000,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 52,000,000us-gaap_CurrentIncomeTaxExpenseBenefit
Current income tax expense (benefit) on repatriation after foreign tax credits   67,000,000dvn_CurrentIncomeTaxExpenseBenefitAfterForeignTaxCredits    
Foreign earnings repatriated 2,800,000,000us-gaap_ForeignEarningsRepatriated 2,800,000,000us-gaap_ForeignEarningsRepatriated 4,300,000,000us-gaap_ForeignEarningsRepatriated  
Deferred income tax expense (benefit)   1,891,000,000us-gaap_DeferredIncomeTaxExpenseBenefit 97,000,000us-gaap_DeferredIncomeTaxExpenseBenefit (184,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred tax liabilities, taxes on unremitted foreign earnings   6,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 157,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Deferred tax liability on formation of EnLink   154,000,000us-gaap_DeferredTaxLiabilitiesOther 52,000,000us-gaap_DeferredTaxLiabilitiesOther  
Income tax expense (benefit)   2,368,000,000us-gaap_IncomeTaxExpenseBenefit 169,000,000us-gaap_IncomeTaxExpenseBenefit (132,000,000)us-gaap_IncomeTaxExpenseBenefit
Unremitted foreign earnings   1,800,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Unremitted earnings from subsidiaries not to be permanently reinvested   22,000,000dvn_UnremittedEarningsFromSubsidiariesNotToBePermanentlyReinvested    
Deferred tax assets, net operating loss carryforwards   200,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 183,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Deferred tax assets, foreign tax credits     248,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Deferred tax assets, alternative minimum tax credits   57,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 105,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Unrecognized tax benefits, interest and penalties   34,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 32,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Unrecognized tax benefit that would impact effective tax rate   223,000,000us-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)     97,000,000us-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   143,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
/ us-gaap_StatementScenarioAxis
= dvn_AssumedRepatriationsOfForeignEarningsMember		    
Repatriated Foreign Earnings [Member]        
Income Tax [Line Items]        
Current income tax expense (benefit)   105,000,000us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= dvn_RepatriatedEarningsMember		 180,000,000us-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)     97,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= dvn_RepatriatedEarningsMember		  
Canada Federal [Member]        
Income Tax [Line Items]        
Deferred tax assets, Canadian net operating loss carryforward   621,000,000us-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   180,000,000us-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)   294,000,000us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= dvn_U.s.NonCoreAssetDivestitureMember		    
EnLink [Member]        
Income Tax [Line Items]        
Deferred tax liability on formation of EnLink   46,000,000us-gaap_DeferredTaxLiabilitiesOther
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= dvn_EnlinkMember		    
Deferred tax assets, net operating loss carryforwards   $ 135,000,000us-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