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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 45,507 $ 56,477 $ 74,309
Estimated investor tax reporting cost 802,400 928,800 1,000,000
Estimated directors fees and expenses 70,739 69,624 64,982
USNG and the Related Public Funds [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses 556,951 521,689 536,375
UNITED STATES GAS FUND LP [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses $ 70,739 69,624 64,982
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 $ 144,440 $ 83,258 $ 204,998