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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) | 12 Months Ended
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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

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