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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of USO's securities (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ 352,450,000	$ 727,450,000
Exchange-Traded Futures Contracts | Swap | OTC Commodity Swap Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(8,919,388)	(2,068)
Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(45,141,590)	28,431,020
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	352,450,000	727,450,000
Level 1 | Exchange-Traded Futures Contracts | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	(45,141,590)	28,431,020
Level 2 | Exchange-Traded Futures Contracts | Swap | OTC Commodity Swap Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities fair value	$ (8,919,388)	$ (2,068)

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