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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fees Paid And Related Party Transactions
Ongoing Registration Fees and Other Offering Expenses	$ 3,203,939	$ 504,876	$ 349,290
Fees and expenses	391,372	333,741	316,185
Licensing fee incurred	512,944	215,376	271,572
Investor tax reporting cost	2,200,000
USO And Related Public Funds
Fees Paid And Related Party Transactions
Fees and expenses	$ 585,896	556,951	521,689
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	$ 3,203,939	504,876	349,290
Fees and expenses	391,372	333,741	316,185
Licensing fee incurred	$ 512,944	$ 215,376	$ 271,572
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=120399700&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=120395209&loc=SL114868664-224227

+ Details

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

X

- Definition

Base Fee Percentage

+ References

No definition available.

+ Details

Name:	uso_BaseFeePercentage
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

Name:	uso_LicenseFeesAndOtherOfferingExpenses
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
Balance Type:	na
Period Type:	duration

X

- Definition

Registration Fees and Other Offering Expenses

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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