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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, 2018
Mar. 31, 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 $ 16,217 $ 18,495  
Estimated directors fees and expenses 15,378 15,207  
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     82,000
UNITED STATES GAS FUND LP [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Licensing fee incurred $ 16,217    
UNITED STATES GAS FUND LP [Member] | Scenario, Forecast [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses     $ 536,000
First $1,000,000,000 of combined net assets of the funds [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Fee percentage 0.04%    
Basis Amount For Fee Percentage 1,000,000,000    
Combined net assets above $1,000,000,000 [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Fee percentage 0.02%    
Basis Amount For Fee Percentage 1,000,000,000    
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 $ 39,269 $ 82,458