XML 29 R24.htm IDEA: XBRL DOCUMENT
v2.4.0.8

CONTRACTS AND AGREEMENTS (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Brokerage commissions | $ 6,641 | $ 7,888 | $ 10,750 | $ 16,290
Rebalancing Investments Transaction [Member] |  |  |  |
Brokerage commissions |  |  | 9,683 | 13,930
Percentage Of Average Daily Net Assets | 90.08% | 85.51% | 90.08% | 85.51%
Creation And Redemption Activity [Member] |  |  |  |
Brokerage commissions |  |  | $ 1,067 | $ 2,360
Percentage Of Average Daily Net Assets | 9.92% | 14.49% | 9.92% | 14.49%

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