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Restructuring Costs (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 46us-gaap_RestructuringCharges $ 54us-gaap_RestructuringCharges $ 74us-gaap_RestructuringCharges
Office Consolidation [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs incurred to date   134us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= dvn_OfficeConsolidationMember
 
Offshore Divestiture [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs incurred to date     196us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= dvn_OffshoreDivestitureMember
Employee Related And Other Costs [Member] | Canadian Divestitures [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 46us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= dvn_EmployeeRelatedAndOtherCostsMember
/ us-gaap_RestructuringPlanAxis
= dvn_CanadaDivestitureMember
   
Accelerated Vesting Of Share-Based Grants For Employees [Member] | Canadian Divestitures [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 15us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= dvn_AcceleratedVestingOfStockAwardsForEmployeesMember
/ us-gaap_RestructuringPlanAxis
= dvn_CanadaDivestitureMember