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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fees Paid and Related Party Transactions [Line Items]      
Investor tax reporting cost $ 670,000 $ 587,711 $ 752,399
Directors fees and expenses 81,479 83,030 70,739
Licensing fee incurred 50,610 60,330 45,507
UNG and the Related Public Funds      
Fees Paid and Related Party Transactions [Line Items]      
Directors fees and expenses $ 1,081,963 585,896 556,951
UNG      
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    
Directors fees and expenses $ 81,479 83,030 70,739
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 $ 364,200 $ 144,440