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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of USO's securities (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 727,450,000	$ 327,450,000
Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(2,068)	(1,906)
Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	28,431,020	3,051,930
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	727,450,000	327,450,000
Level 1 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	28,431,020	3,051,930
Level 2 | Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ (2,068)	$ (1,906)

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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/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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