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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     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 $ 13,326 $ 16,513 $ 29,543 $ 35,008  
Estimated directors fees and expenses $ 17,345 $ 14,400 $ 32,723 29,607  
Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated investor tax reporting cost         $ 900,000
USNG and the Related Public Funds [Member] | Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors fees and expenses         66,700
UNITED STATES GAS FUND LP [Member] | Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors fees and expenses         $ 536,200
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     $ 53,825 $ 121,724