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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Fees Paid And Related Party Transactions
Ongoing Registration Fees and Other Offering Expenses	$ 267,714	$ 127,886
Fees and expenses	93,112	81,721
Licensing fee incurred	$ 55,315	60,114
Forecast
Fees Paid And Related Party Transactions
Investor tax reporting cost			$ 1,500,000
USO And Related Public Funds | Forecast
Fees Paid And Related Party Transactions
Fees and expenses			574,000
USCF
Fees Paid And Related Party Transactions
USCF Management Fee	0.45%
USO
Fees Paid And Related Party Transactions
Ongoing Registration Fees and Other Offering Expenses	$ 267,714	127,886
Licensing fee incurred	$ 55,315	$ 60,114
USO | Forecast
Fees Paid And Related Party Transactions
Fees and expenses			$ 353,000
Licensing Agreements
Fees Paid And Related Party Transactions
Fee percentage	0.015%

X

- Definition

Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

+ 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 210.5-03.6)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Base Fee Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represent the value of license fees and other offering expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of Contractual Obligation to Pay Fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
Data Type:	num:percentItemType
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X

- Definition

Registration Fees and Other Offering Expenses

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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X

- Details

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- Details

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- Details

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- Details

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