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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fees Paid and Related Party Transactions [Line Items]      
USCF Management Fee UNG. For these services, 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 $ 74,309 $ 81,594 $ 91,139
Estimated investor tax reporting cost 1,000,000 400,000 800,000
Estimated directors fees and expenses 64,982 94,521 118,994
USNG and the Related Public Funds [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses 536,375 582,050 569,303
UNITED STATES GAS FUND LP [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Licensing fee incurred 74,309 81,594  
Estimated directors fees and expenses $ 64,982    
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 $ 204,998 404,792 379,106
Estimated directors fees and expenses   $ 94,521 $ 118,994