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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) | 9 Months Ended
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Sep. 30, 2015 USD ($) shares
Number of Units Per Baskets | 50,000
Transaction Fee | $ | $ 350

X
- Definition Number of Units Per Baskets. + References No definition available. + Details
Name: | bno_NumberOfUnitsPerBaskets
Namespace Prefix: | bno_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition A description of what the Transaction fee during the period. + References No definition available. + Details
Name: | bno_TransactionFee
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration