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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Per Share Operating Performance: |  |  |
Net asset value, beginning of period |  | $ 12.22 | $ 22.39
Total income (loss) |  | 0.11 | (1.86)
Net expenses |  | (0.02) | (0.05)
Net increase (decrease) in net asset value |  | 0.09 | (1.91)
Net asset value, end of period |  | $ 12.31 | $ 20.48
Total Return |  | 0.74% | (8.53%)
Ratios to Average Net Assets |  |  |
Total income (loss) |  | 6.92% | (2.95%)
Management fees | [1] | 0.75% | 0.75%
Total expenses excluding management fees | [1] | 0.40% | 0.29%
Expenses waived | [1] | (0.25%) | (0.13%)
Net expenses excluding management fees | [1] | 0.15% | 0.16%
Net income (loss) |  | 6.70% | (3.17%)
[1] | Annualized.

X
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Balance Type: | na
Period Type: | instant

X
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- Definition Representing percentage value of management fees on net assets. + References No definition available. + Details
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Balance Type: | na
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- Definition Representing percentage value of net expenses excluding management fees on net assets. + References No definition available. + Details
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Period Type: | duration

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- References No definition available. + Details
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- Definition Representing percentage value of total expenses excluding management fees on net assets. + References No definition available. + Details
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Period Type: | duration

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- Definition Representing percentage value of total income on net assets. + References No definition available. + Details
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- Definition Representing percentage of total return. + References No definition available. + Details
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- Definition Representing per share value of total expense. + References No definition available. + Details
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Namespace Prefix: | bno_
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Balance Type: | na
Period Type: | duration

X
- Definition Representing per share value of total income. + References No definition available. + Details
Name: | bno_TotalIncomePerUnit
Namespace Prefix: | bno_
Data Type: | num:perShareItemType
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Period Type: | duration