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Contracts And Agreements (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Brokerage commissions	$ 7,785	$ 6,739	$ 18,535	$ 23,029
Rebalancing Investments Transaction [Member]
Brokerage commissions			17,062	19,736
Percentage Of Average Daily Net Assets	92.05%	85.70%	92.05%	85.70%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 1,473	$ 3,293
Percentage Of Average Daily Net Assets	7.95%	14.30%	7.95%	14.30%

X

- Definition

Percentage Of Average Daily Net Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	bno_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

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