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Cover
Apr. 30, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 30, 2020
Entity File Number 001-32834
Entity Registrant Name UNITED STATES OIL FUND, LP
Entity Central Index Key 0001327068
Entity Tax Identification Number 20-2830691
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1850 Mt. Diablo Boulevard
Entity Address, Address Line Two 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Shares of United States Oil Fund, LP
Trading Symbol USO
Security Exchange Name NYSEArca
Entity Emerging Growth Company false
Entity Information, Former Legal or Registered Name Not Applicable