XML 39 R24.htm IDEA: XBRL DOCUMENT
v3.7.0.1

CONTRACTS AND AGREEMENTS (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Brokerage commissions | $ 29,924 | $ 53,272
Percentage Of Average Daily Net Assets | 0.11% | 0.22%
Rebalancing Investments Transaction [Member] |  |
Brokerage commissions | $ 29,790 | $ 51,031
Percentage Of Average Daily Net Assets | 99.55% | 95.79%
Creation And Redemption Activity [Member] |  |
Brokerage commissions | $ 134 | $ 2,241
Percentage Of Average Daily Net Assets | 0.45% | 4.21%

X
- Definition Percentage Of Average Daily Net Assets + References No definition available. + Details
Name: | bno_PercentageOfAverageDailyNetAssets
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
Name: | us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=bno_RebalancingInvestmentsTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=bno_TradesNecessitatedByCreationAndRedemptionActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |