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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 6 Months Ended
Apr. 10, 2006
USD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
$ / item
shares
Apr. 28, 2020
$ / shares
shares
Mar. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
 [1]
Jun. 30, 2019
$ / shares
 [2]
Mar. 31, 2019
$ / shares
 [2]
Dec. 31, 2018
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure                
Shares of USO issued   185,362,500 1,482,900,000          
Shares of USO outstanding   185,362,500 1,482,900,000          
Per share NAV | $ / shares   $ 16.35 $ 2.04          
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 5,627,000,000            
Net asset value per unit | $ / shares $ 67.39 $ 28.02   $ 33.94 $ 102.27 $ 97.06 $ 100.00 $ 76.68
Limited Partners' Capital Account, Units Issued 200,000              
Value of units issued | $ $ 13,479,000              
Number of successive valuation days   30 days            
Average daily percentage change in the price of the Benchmark Futures Contract considered   10.00%            
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   117,998            
[1] On April 28, 2020, there was a 1-for-8 reverse share split. The Condensed Statement of Financial Conditions have been adjusted for the periods shown  to reflect the 1-for-8 reverse share split on retroactive basis.
[2] On April 28, 2020, there was a 1-for-8 reverse share split. The Financial Highlights have been adjusted for the period shown to reflect the 1-for-8 reverse share split on retroactive basis.