XML 21 R25.htm IDEA: XBRL DOCUMENT
v2.4.1.9

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