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Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)		$ 1,602,274,244	$ (1,905,181,579)	$ 473,455,704
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Change in unrealized (gain) loss on open commodity futures contracts		287,006,734	(363,923,391)	(231,913,525)
(Increase) decrease in dividends receivable		(30,032)	2,200	138,151
(Increase) decrease in interest receivable		107,416	(132,758)	831
(Increase) decrease in prepaid insurance*		(106,243)	817	(7,571)
(Increase) decrease in prepaid registration fees		1,260,041	(1,185,800)	504,876
(Increase) decrease in ETF transaction fees receivable		2,000	0	0
Increase (decrease) in payable due to Broker		(23,667,355)	14,846,706	8,820,649
Increase (decrease) in General Partner management fees payable		(469,125)	939,671	(116,084)
Increase (decrease) in professional fees payable		1,712,827	449,177	(287,285)
Increase (decrease) in brokerage commissions payable		(123,270)	233,897	0
Increase (decrease) in directors' fees payable*	[1]	(7,712)	8,661	441
Increase (decrease) in license fees payable		(40,723)	129,894	(13,869)
Net cash provided by (used in) operating activities		1,867,918,802	(2,253,812,505)	250,582,318
Cash Flows from Financing Activities:
Addition of partnership shares		1,239,249,023	8,030,979,653	3,218,764,872
Redemption of partnership shares		(4,151,987,568)	(3,644,174,420)	(3,950,037,755)
Net cash provided by (used in) financing activities		(2,912,738,545)	4,386,805,233	(731,272,883)
Net Increase (Decrease) in Cash and Cash Equivalents		(1,044,819,743)	2,132,992,728	(480,690,565)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		3,309,238,139	1,176,245,411	1,656,935,976
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		$ 2,264,418,396	$ 3,309,238,139	$ 1,176,245,411
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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No definition available.

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

X

- Definition

It represents the increase and decrease in other income of a business entity.

+ References

No definition available.

+ Details

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

X

- Definition

The change during the period, either increase or decrease, in amounts payable due to broker.

+ References

No definition available.

+ Details

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

X

- Definition

Increase (Decrease) In Professional Fees Payable

+ References

No definition available.

+ Details

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

X

- Definition

Net change in management fee payable.

+ References

No definition available.

+ Details

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

X

- Definition

Payments To Partnership Redemption.

+ References

No definition available.

+ Details

Name:	uso_PaymentsToPartnershipRedemption
Namespace Prefix:	uso_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration