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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Brokerage commissions	$ 694,480	$ 1,161,407
Commission [Member]
Brokerage commissions	$ 694,480	$ 1,161,407
Percentage of average daily net assets	0.14%	0.16%
Rebalancing Investments Transaction [Member]
Brokerage commissions	$ 575,146	$ 1,060,043
Percentage of average daily net assets	82.82%	91.27%
Creation And Redemption Activity [Member]
Brokerage commissions	$ 119,334	$ 101,364
Percentage of average daily net assets	17.18%	8.73%

X

- Definition

The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of Average Daily Net Assets

+ References

No definition available.

+ Details

Name:	uso_PercentageOfAverageDailyNetAssets
Namespace Prefix:	uso_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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