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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fees Paid and Related Party Transactions [Line Items]      
Licensing fee incurred $ 60,330 $ 45,507 $ 56,477
Estimated investor tax reporting cost 587,700 802,400 928,800
Estimated directors fees and expenses 83,030 70,739 69,624
USNG and the Related Public Funds [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses $ 585,896 556,951 521,689
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    
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 $ 364,200 $ 144,440 $ 83,258