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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Fees Paid and Related Party Transactions [Line Items]          
Licensing fee incurred $ 10,694 $ 13,789 $ 33,451 $ 45,524  
Estimated investor tax reporting cost         $ 725,000
Estimated directors fees and expenses 20,166 $ 19,075 $ 58,149 63,273 78,000
USNG and the Related Public Funds [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors fees and expenses         $ 1,061,000
UNITED STATES GAS FUND LP [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Monthly fee obligated to pay on average daily total net assets, maximum base fee 1,000,000,000 (as a percentage)     0.60    
Average daily total net assets $ 1,000,000,000   $ 1,000,000,000    
Monthly fee obligated to pay on average daily total net assets (as a percentage)     0.50    
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     $ 103,290 $ 281,400