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v3.19.1

FINANCIAL HIGHLIGHTS (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Per Share Operating Performance: |  |  |
Net asset value, beginning of year |  | $ 15.18 | $ 18.18
Total income (loss) |  | 4.08 | 0.99
Net expenses |  | (0.04) | (0.04)
Net increase (decrease) in net asset value |  | 4.04 | 0.95
Net asset value, end of year |  | $ 19.22 | $ 19.13
Total Return |  | 26.61% | 5.23%
Ratios to Average Net Assets |  |  |
Total income (loss) |  | 22.38% | 5.04%
Management fees | [1] | 0.75% | 0.75%
Total expenses excluding management fees | [1] | 0.18% | 0.40%
Expenses waived | [1] | (0.03%) | (0.25%)
Net expenses excluding management fees | [1] | 0.15% | 0.15%
Net income (loss) |  | 22.16% | 4.82%
[1] | Annualized

X
- Definition Net asset value per unit. + References No definition available. + Details
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Balance Type: | na
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X
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Period Type: | duration

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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
Period Type: | duration

X
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Balance Type: | na
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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Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
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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Namespace Prefix: | bno_
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Balance Type: | na
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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_
Data Type: | num:perShareItemType
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
Balance Type: | na
Period Type: | duration