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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of USO's securities (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 492,450,000	$ 727,450,000
Exchange-Traded Futures Contracts | Swap | OTC Commodity Swap Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	6,015,701	(2,068)
Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	38,213,260	28,431,020
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	492,450,000	727,450,000
Level 1 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	38,213,260	28,431,020
Level 2 | Exchange-Traded Futures Contracts | Swap | OTC Commodity Swap Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 6,015,701	$ (2,068)

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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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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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