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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of USO's securities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 327,450,000	$ 856,400,000
Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(1,906)	(4,145)
Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	3,051,930	22,185,936
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	327,450,000	856,400,000
Level 1 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	3,051,930	22,185,936
Level 2 | Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ (1,906)	$ (4,145)

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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