XML 45 R30.htm IDEA: XBRL DOCUMENT
v3.21.2

FINANCIAL HIGHLIGHTS (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Per Share Operating Performance: |  |  |  |
Net asset value, beginning of year | $ 15.84 | $ 7.97 | $ 12.91 | $ 20.91
Total income (loss) | 3.45 | 2.82 | 6.41 | (10.10)
Total expenses | (0.05) | (0.02) | (0.08) | (0.04)
Net increase (decrease) in net asset value | 3.40 | 2.80 | 6.33 | (10.14)
Net asset value, end of year | $ 19.24 | $ 10.77 | $ 19.24 | $ 10.77
Total Return | 21.46% | 35.13% | 49.03% | (48.49%)
Ratios to Average Net Assets |  |  |  |
Total income (loss) | 19.73% | 41.99% | 41.40% | 28.07%
Management fees | 0.75% | 0.75% | 0.75% | 0.75%
Total expenses excluding management fees | 0.39% | 0.43% | 0.34% | 0.43%
Expenses waived | (0.08%) | (0.27%) | (0.12%) | (0.27%)
Net expense excluding management fees | 0.31% | 0.16% | 0.22% | 0.16%
Net income (loss) | 19.47% | 41.77% | 40.92% | 27.62%

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