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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Valuation of Securities Using Fair Value Hierarchy | The following table summarizes the valuation of USO’s securities at December 31, 2017 using the fair value hierarchy:
At December 31, 2017 |  | Total |  | Level I |  | Level II |  | Level III |
Short-Term Investments |  | $ | 1,989,077,878 |  | $ | 1,989,077,878 |  | $ | — |  | $ | — |
Exchange-Traded Futures Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
United States Contracts |  |  | 117,780,350 |  |  | 117,780,350 |  |  | — |  |  | — |
During the year ended December 31, 2017, there were no transfers between Level I and Level II. The following table summarizes the valuation of USO’s securities at December 31, 2016 using the fair value hierarchy:
At December 31, 2016 |  | Total |  | Level I |  | Level II |  | Level III |
Short-Term Investments |  | $ | 2,770,212,015 |  | $ | 2,770,212,015 |  | $ | — |  | $ | — |
Exchange-Traded Futures Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
United States Contracts |  |  | 111,290,560 |  |  | 111,290,560 |  |  | — |  |  | — |
Fair Value of Derivative Instruments | Fair Value of Derivative Instruments
Derivatives not Accounted for as Hedging Instruments |  | Statements of Financial Condition Location |  | Fair Value At December 31, 2017 |  | Fair Value At December 31, 2016 |
Futures - Commodity Contracts |  | Assets |  | $ | 117,780,350 |  | $ | 111,290,560 |
Effect of Derivative Instruments on Condensed Statements of Operations | The Effect of Derivative Instruments on the Statements of Operations
|  |  |  | For the year ended December 31, 2017 |  | For the year ended December 31, 2016 |  | For the year ended December 31, 2015 |
Derivatives not Accounted for as Hedging Instruments |  | Location of Gain (Loss) on Derivatives Recognized in Income |  | Realized Gain (Loss) on Derivatives Recognized in Income |  | Change in Unrealized Gain (Loss) on Derivatives Recognized in Income |  | Realized Gain (Loss) on Derivatives Recognized in Income |  | Change in Unrealized Gain (Loss) on Derivatives Recognized in Income |  | Realized Gain (Loss) on Derivatives Recognized in Income |  | Change in Unrealized Gain (Loss) on Derivatives Recognized in Income |
Futures - Commodity Contracts |  | Realized gain (loss) on closed positions |  | $ | 70,673,279 |  |  |  |  | $ | 431,308,189 |  |  |  |  | $ | (1,300,519,431) |  |  |  |
|  | Change in unrealized gain (loss) on open positions |  |  |  |  | $ | 6,489,790 |  |  |  |  | $ | 249,798,620 |  |  |  |  | $ | 29,109,870 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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