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Organization And Business (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 02, 2010 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | May 31, 2010
Units Issued During Period To Authorized Purchasers Through Distributors |  | 50,000 bno_UnitsIssuedDuringPeriodToAuthorizedPurchasersThroughDistributors |  |  |  |  |  |  |
Transaction Fee |  | $ 350 bno_TransactionFee |  |  |  |  |  |  |
Initially Registered Units Of Entity With Sec |  | 50,000,000 us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized |  |  |  |  |  |  | 50,000,000 us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized
Net asset value per share | $ 50.00 bno_NetAssetValuePerUnit | $ 22.39 bno_NetAssetValuePerUnit | $ 43.81 bno_NetAssetValuePerUnit |  | $ 40.98 bno_NetAssetValuePerUnit | [1] | $ 37.27 bno_NetAssetValuePerUnit | [1] |
Initial stock units issued | 200,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued | 450,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued |  |  |  |  |  |  |
Initial Stock Units Outstanding |  | 450,000 bno_InitialStockUnitsOutstanding |  |  |  |  |  |  |
Initial Units Value, Issued | 10,000,000 bno_InitialUnitsValueIssued |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Net asset value per share |  | $ 89.92 bno_NetAssetValuePerUnit / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Initial stock units issued |  | 900,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Initial Stock Units Outstanding |  | 900,000 bno_InitialStockUnitsOutstanding / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Net asset value per share |  | $ 44.96 bno_NetAssetValuePerUnit / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Prior to July 1, 2011 [Member] |  |  |  |  |  |  |  |  |
Transaction Fee |  | $ 1,000 bno_TransactionFee / bno_PeriodAxis = bno_PriorToFebruaryTwentyNineTwoThousandTwelveMember |  |  |  |  |  |  |
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures CO February 2014 contracts, expiring January 2014 and February 2013 contracts, expiring January 2013 [Member] |  |  |  |  |  |  |  |  |
Number of Contracts |  | 722 us-gaap_InvestmentOwnedBalanceContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | 237 us-gaap_InvestmentOwnedBalanceContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | [2] |  |  |  |  |
[1] | On August 26, 2013, BNO executed a 2-for-1 forward share split for all shareholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward share split was payable after the close of markets on August 28, 2013. BNO began trading at its post split price on August 29, 2013. The Financial Highlights have been adjusted for the periods shown to reflect the 2-for-1 forward share split on a retroactive basis.
[2] | Collateral amounted to $3,271,010 on open futures contracts.

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