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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $) | 3 Months Ended
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Mar. 31, 2014
Number Rof Units Per Baskets | 50,000
Transaction Fee | $ 350

X
- Definition Number rof Units Per Baskets. + References No definition available. + Details
Name: | bno_NumberRofUnitsPerBaskets
Namespace Prefix: | bno_
Data Type: | us-types:perUnitItemType
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