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Asset Impairments (Summary of Asset Impairments) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Impaired Long-Lived Assets Held and Used [Line Items]    
Asset impairment charges, gross $ 5,460us-gaap_AssetImpairmentCharges   
Asset impairment charges, after taxes 3,467dvn_AssetImpairmentChargesAfterTax  
U.S. Oil And Gas Assets [Member]    
Impaired Long-Lived Assets Held and Used [Line Items]    
Asset impairment charges, gross 5,458us-gaap_AssetImpairmentCharges
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= dvn_USOilAndGasAssetsMember		  
Asset impairment charges, after taxes 3,466dvn_AssetImpairmentChargesAfterTax
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= dvn_USOilAndGasAssetsMember		  
Other Assets [Member]    
Impaired Long-Lived Assets Held and Used [Line Items]    
Asset impairment charges, gross 2us-gaap_AssetImpairmentCharges
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= us-gaap_OtherAssetsMember		  
Asset impairment charges, after taxes $ 1dvn_AssetImpairmentChargesAfterTax
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= us-gaap_OtherAssetsMember