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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of USO's securities (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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Short-Term Investments |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities fair value | $ 675,000,000 | $ 727,450,000
Exchange-Traded Futures Contracts | Swap | OTC Commodity Swap Contracts |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities fair value | 91,039 | (2,068)
Exchange-Traded Futures Contracts | United States Contracts |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities fair value | (2,068,190) | 28,431,020
Level 1 | Short-Term Investments |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities fair value | 675,000,000 | 727,450,000
Level 1 | Exchange-Traded Futures Contracts | United States Contracts |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities fair value | (2,068,190) | 28,431,020
Level 2 | Exchange-Traded Futures Contracts | Swap | OTC Commodity Swap Contracts |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities fair value | $ 91,039 | $ (2,068)

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