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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Fees Paid and Related Party Transactions [Line Items]      
USCF Management Fee UNG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets of $1,000,000,000 or less and 0.50% per annum of average daily total net assets that are greater than $1,000,000,000.    
Licensing fee incurred $ 10,823 $ 16,217  
Estimated investor tax reporting cost     $ 750,000
Estimated directors fees and expenses $ 17,201 15,378 58,100
USNG and the Related Public Funds [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses     $ 545,250
Licensing Agreements [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Fee percentage 0.015%    
United States Oil Fund LP [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Ongoing Registration Fees and Other Offering Expenses $ 25,390 $ 39,269