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Condensed Statements of Cash Flows (Unaudited) - USD ($)		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities:
Net income (loss)		$ 1,510,372,989	$ (2,460,546,099)
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		73,910,705	(59,173,693)
(Increase) decrease in dividends receivable		(30,850)	(22,782)
(Increase) decrease in interest receivable		100,639	(117,062)
(Increase) decrease in prepaid insurance*	[1]	(270,588)	(38,498)
(Increase) decrease in prepaid registration fees		1,260,041	(2,148,443)
(Increase) decrease in ETF transaction fees receivable		2,000	(351)
Increase (decrease) in payable due to Broker		68,083,278	(8,820,649)
Increase (decrease) in General Partner management fees payable		(440,244)	1,067,587
Increase (decrease) in professional fees payable		184,002	(179,069)
Increase (decrease) in brokerage commissions payable		(85,947)	207,158
Increase (decrease) in directors' fees payable*	[1]	(5,617)	14,179
Increase (decrease) in license fees payable		(35,430)	152,917
Net cash provided by (used in) operating activities		1,653,044,978	(2,529,604,805)
Cash Flows from Financing Activities:
Addition of partnership shares		664,230,493	7,985,349,311
Redemption of partnership shares		(3,220,487,860)	(2,644,920,161)
Net cash provided by (used in) financing activities		(2,556,257,367)	5,340,429,150
Net Increase (Decrease) in Cash and Cash Equivalents		(903,212,389)	2,810,824,345
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period		3,309,238,139	1,176,245,411
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period		$ 2,406,025,750	$ 3,987,069,756
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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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