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Document And Entity Information
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Oct. 22, 2014
Document And Entity Information [Abstract]    
Document Type 10-Q  
Document Period End Date Sep. 30, 2014  
Amendment Flag false  
Entity Registrant Name DEVON ENERGY CORP/DE  
Entity Central Index Key 0001090012  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2014  
Entity Filer Category Large Accelerated Filer  
Document Fiscal Period Focus Q3  
Entity Common Stock, Shares Outstanding   409.1