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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
FAIR VALUE OF FINANCIAL INSTRUMENTS |
Valuation of Securities Using Fair Value Hierarchy | The following table summarizes the valuation of USO’s securities at December 31, 2020 using the fair value hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2020 |  | Total |  | Level I |  | Level II |  | Level III
Short-Term Investments | ​ | $ | 418,534,000 | ​ | $ | 418,534,000 | ​ | $ | — | ​ | $ | —
Exchange-Traded Futures Contracts | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  |
United States Contracts | ​ |  | 401,443,958 | ​ |  | 401,443,958 | ​ |  | — | ​ |  | —
​ The following table summarizes the valuation of USO’s securities at December 31, 2019 using the fair value hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2019 |  | Total |  | Level I |  | Level II |  | Level III
Short-Term Investments | ​ | $ | 1,175,542,347 | ​ | $ | 1,175,542,347 | ​ | $ | — | ​ | $ | —
Exchange-Traded Futures Contracts | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  |
United States Contracts | ​ |  | 37,520,567 | ​ |  | 37,520,567 | ​ |  | — | ​ |  | —
Fair Value of Derivative Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​
​ |  | Statements of |  | Fair Value |  | Fair Value
​ | ​ | Financial | ​ | at December 31, | ​ | at December 31,
Derivatives not Accounted for as Hedging Instruments | ​ | Condition Location | ​ | 2020 | ​ | 2019
Futures - Commodity Contracts |  | Assets | ​ | $ | 401,443,958 | ​ | $ | 37,520,567
Effect of Derivative Instruments on Condensed Statements of Operations | The Effect of Derivative Instruments on the Statements of Operations ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | For the year ended | ​ | For the year ended | ​ | For the year ended
​ | ​ | ​ | ​ | December 31, 2020 | ​ | December 31, 2019 | ​ | December 31, 2018
​ | ​ | ​ | ​ | ​ | ​ | Change in | ​ | ​ | ​ | ​ | Change in | ​ | ​ | ​ | Change in
​ | ​ | Location of | ​ | Realized | ​ | Unrealized | ​ | Realized | ​ | Unrealized | ​ | Realized | ​ | Unrealized
Derivatives not | ​ | Gain (Loss) | ​ | gain (Loss) | ​ | Gain (Loss) on | ​ | Gain (Loss) | ​ | Gain (Loss) on | ​ | Gain (Loss) | ​ | Gain (Loss) on
Accounted for | ​ | on Derivatives | ​ | on Derivatives | ​ | Derivatives | ​ | in Derivatives | ​ | Derivatives | ​ | in Derivatives | ​ | Derivatives
as Hedging | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in
Instruments |  | Income |  | Income |  | Income |  | Income |  | Income |  | Income |  | Income
Futures - Commodity Contracts |  | Realized gain (loss) on closed positions | ​ | $ | (2,251,576,260) |  | ​ |  | ​ | $ | 220,179,889 |  | ​ |  | ​ | $ | 1,603,334 |  | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Change in unrealized gain (loss) on open positions | ​ | ​ | ​ | ​ | $ | 363,923,391 | ​ | ​ | ​ | ​ | $ | 231,913,525 | ​ | ​ | ​ | ​ | $ | (312,173,308)

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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