XML 29 R31.htm IDEA: XBRL DOCUMENT
v3.20.1

FINANCIAL HIGHLIGHTS (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Per Share Operating Performance: |  |  |
Net asset value, beginning of year | $ 15.18 | $ 18.18 | $ 15.70
Total income (loss) | 5.90 | (2.82) | 2.61
Net expenses | (0.17) | (0.18) | (0.13)
Net increase (decrease) in net asset value | 5.73 | (3.00) | 2.48
Net asset value, end of year | $ 20.91 | $ 15.18 | $ 18.18
Total Return | 37.75% | (16.50%) | 15.80%
Ratios to Average Net Assets |  |  |
Total income (loss) | 31.50% | (14.88%) | 16.22%
Management fees | 0.75% | 0.75% | 0.75%
Total expenses excluding management fees | 0.24% | 0.23% | 0.48%
Expenses waived | (0.09%) | (0.08%) | (0.33%)
Net expenses excluding management fees | 0.15% | 0.15% | 0.15%
Net income (loss) | 30.60% | (15.78%) | 15.32%

X
- Definition Net asset value per unit. + References No definition available. + Details
Name: | bno_NetAssetValuePerUnit
Namespace Prefix: | bno_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Representing per share value net increase decrease in net asset. + References No definition available. + Details
Name: | bno_NetIncreaseDecreaseInNetAssetValue
Namespace Prefix: | bno_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition expenses write off + References No definition available. + Details
Name: | bno_OperatingPerformancePerUnitAbstract
Namespace Prefix: | bno_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage value of total expenses waived on net assets. + References No definition available. + Details
Name: | bno_PercentageOfExpensesWaivedOnNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage value of management fees on net assets. + References No definition available. + Details
Name: | bno_PercentageOfManagementFeesOnNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage value of net expenses excluding management fees on net assets. + References No definition available. + Details
Name: | bno_PercentageOfNetExpensesExcludingManagementFeeOnNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage value of net income on net assets. + References No definition available. + Details
Name: | bno_PercentageOfNetIncomeOnNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | bno_PercentageOfRatiosToAverageNetAssetsAbstract
Namespace Prefix: | bno_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage value of total expenses excluding management fees on net assets. + References No definition available. + Details
Name: | bno_PercentageOfTotalExpensesExcludingManagementFeesOnNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage value of total income on net assets. + References No definition available. + Details
Name: | bno_PercentageOfTotalIncomeOnNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing percentage of total return. + References No definition available. + Details
Name: | bno_PercentageOfTotalReturn
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Representing per share value of total expense. + References No definition available. + Details
Name: | bno_TotalExpensePerUnit
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