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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019
Fees Paid and Related Party Transactions [Line Items] |  |  |
USCF Management Fee | UNG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets of $1,000,000,000 or less and 0.50% per annum of average daily total net assets that are greater than $1,000,000,000. |  |
Licensing fee incurred | $ 10,823 | $ 16,217 |
Estimated investor tax reporting cost |  |  | $ 750,000
Estimated directors fees and expenses | $ 17,201 | 15,378 | 58,100
USNG and the Related Public Funds [Member] |  |  |
Fees Paid and Related Party Transactions [Line Items] |  |  |
Estimated directors fees and expenses |  |  | $ 545,250
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 | $ 25,390 | $ 39,269 |

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- Definition Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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