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v3.19.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) | Mar. 31, 2019 shares
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Number of Units Per Baskets | 50,000
Redemption Baskets [Member] |
Number of Units Per Baskets | 350

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

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