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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Fees Paid and Related Party Transactions [Line Items]          
USCF Management Fee     USL is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets.
    
Licensing fee incurred $ 3,165 $ 3,985 $ 6,347 $ 8,312  
Estimated directors' fees and expenses $ 3,583 $ 3,468 $ 6,814 $ 6,588  
Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated investor tax reporting cost         $ 150,000
Estimated directors' fees and expenses         14,500
USL and the Related Public Funds, other than USCI, USAG, CPER and USMI | Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors' fees and expenses         $ 536,200
On and after October 20, 2011          
Fees Paid and Related Party Transactions [Line Items]          
Fee percentage     0.015%