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CONTRACTS AND AGREEMENTS (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) $ / item
Marketing Agreement
Long-Duration Contracts, Assumptions by Product and Guarantee
Marketing fee exclusive of the incentive fee	$ 425,000
Marketing Agreement | USOF's assets from $0- $500 million
Long-Duration Contracts, Assumptions by Product and Guarantee
Fee percentage	0.00%
Marketing Agreement | USOF's assets from $0- $500 million | Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee
Base amount for determining fee percentage	$ 0
Marketing Agreement | USOF's assets from $0- $500 million | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee
Base amount for determining fee percentage	$ 500,000,000
Marketing Agreement | USOF's assets from $500 million - $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee
Fee percentage	0.04%
Marketing Agreement | USOF's assets from $500 million - $4 billion | Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee
Base amount for determining fee percentage	$ 500,000,000
Marketing Agreement | USOF's assets from $500 million - $4 billion | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee
Base amount for determining fee percentage	$ 4,000,000,000
Marketing Agreement | USOF's assets in excess of $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee
Fee percentage	0.03%
Ratio of expense to Average Net Assets	10.00%
Marketing Agreement | USOF's assets in excess of $4 billion | Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee
Base amount for determining fee percentage	$ 4,000,000,000
Brokerage and Futures Commission Merchant Agreements | Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | $ / item	7
Brokerage and Futures Commission Merchant Agreements | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | $ / item	8

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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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