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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]      
Goodwill $ 6,303us-gaap_Goodwill $ 5,858us-gaap_Goodwill $ 6,079us-gaap_Goodwill
Acquired during period 3,283us-gaap_GoodwillAcquiredDuringPeriod    
Removal of goodwill for asset divestitures 706us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit 26us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Goodwill impairments 1,941us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Customer Relationships [Member]      
Goodwill [Line Items]      
Customer relationships, Gross amount 569us-gaap_FiniteLivedCustomerRelationshipsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Customer relationships, Accumulated amortization 36us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Weighted average amortization period 13 years 8 months 12 days    
Amortization expense of intangible assets 36us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Canada [Member]      
Goodwill [Line Items]      
Goodwill   2,838us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
3,033us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Removal of goodwill for asset divestitures 706us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
   
Goodwill impairments 1,941us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
   
EnLink [Member]      
Goodwill [Line Items]      
Goodwill 3,685us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dvn_EnlinkMember
402us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dvn_EnlinkMember
402us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dvn_EnlinkMember
Acquired during period $ 3,283us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= dvn_EnlinkMember