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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of USO's securities (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 327,450,000	$ 327,450,000
Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(2,224)	(1,906)
Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	53,240,170	3,051,930
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	327,450,000	327,450,000
Level 1 | Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	0
Level 1 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	53,240,170	3,051,930
Level 2 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	0	0
Level 2 | Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(2,224)	(1,906)
Level 2 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	0	0
Level 3 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	0	0
Level 3 | Exchange-Traded Futures Contracts | Swap | OTC
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	0	0
Level 3 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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