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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) | 12 Months Ended
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Dec. 31, 2017 USD ($) shares
Number of Units Per Baskets | shares | 50,000
Transaction Fee | $ 350
Redemption Baskets [Member] |
Transaction Fee | $ 350

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- 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

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- Details
Name: | invest_InvestmentSecuritiesClassAxis=bno_RedemptionBasketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |