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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2022
Jul. 22, 2022
Document And Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2022  
Entity File Number 001-32834  
Entity Registrant Name United States Oil Fund, LP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-2830691  
Entity Address, Address Line One 1850 Mt. Diablo Boulevard, Suite 640  
Entity Address, City or Town Walnut Creek  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94596  
City Area Code 510  
Local Phone Number 522-9600  
Title of 12(b) Security Shares of United States Oil Fund, LP  
Trading Symbol USO  
Security Exchange Name NYSEArca  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   30,323,603
Entity Central Index Key 0001327068  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q2  
Amendment Flag false