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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2015
Aug. 03, 2015
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Entity Registrant Name United States Oil Fund, LP  
Entity Central Index Key 0001327068  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Trading Symbol USO  
Entity Common Stock, Shares Outstanding   160,900,000