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Summary Of Significant Accounting Policies (Details Textual)	Dec. 31, 2014
Number Rof Shares Per Baskets	50,000bno_NumberRofSharesPerBaskets

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- Definition

Number rof shares Per Baskets.

+ References

No definition available.

+ Details

Name:	bno_NumberRofSharesPerBaskets
Namespace Prefix:	bno_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant