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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Fees Paid and Related Party Transactions [Line Items]      
Licensing fee incurred $ 17,204 $ 10,823  
Estimated directors fees and expenses $ 24,503 17,201  
Scenario, Forecast [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated investor tax reporting cost     $ 760,000
USNG and the Related Public Funds [Member] | Scenario, Forecast [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses     574,000
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    
Monthly fee obligated to pay on average daily total net assets (as a percentage) 0.50    
UNITED STATES GAS FUND LP [Member] | Scenario, Forecast [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses     $ 124,000
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 $ 68,250 $ 25,390