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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Apr. 10, 2006
USD ($)
$ / shares
shares
Apr. 28, 2020
$ / shares
shares
Mar. 31, 2020
$ / shares
$ / item
shares
Dec. 31, 2019
$ / shares
 [1]
Mar. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure            
Shares of USO issued   596,600,000 74,575,000      
Shares of USO outstanding   596,600,000 74,575,000      
Per share NAV | $ / shares   $ 4.24 $ 33.94      
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / item     1,000      
Limited Partners' Capital Account, Units Authorized 17,000,000   4,627,000,000      
Net asset value per unit | $ / shares $ 67.39   $ 33.94 [1] $ 102.27 $ 100.00 $ 76.68
Limited Partners' Capital Account, Units Issued 200,000          
Value of units issued | $ $ 13,479,000          
Creation Baskets            
Organization, Consolidation and Presentation of Financial Statements Disclosure            
Number of units per basket     100,000      
Redemption Baskets            
Organization, Consolidation and Presentation of Financial Statements Disclosure            
Number of units per basket     100,000      
Open Futures Contracts- Long | United States Contracts | NYMEX WTI Crude Oil Futures CL May 2020 contracts, expiring April 2020            
Organization, Consolidation and Presentation of Financial Statements Disclosure            
Number of Contracts [2]     123,602      
[1] On April 28, 2020 there was a 1-for-8 reverse share split. The Statement of Operations have been adjusted for the periods shown to reflect the 1-for-8 reverse share split on a retroactive basis.
[2] Collateral amounted to $1,679,319,722 on open futures contracts.