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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   50,000bno_UnitsIssuedDuringPeriodToAuthorizedPurchasersThroughDistributors        
Transaction Fee   $ 350bno_TransactionFee        
Initially Registered Units Of Entity With Sec   50,000,000us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized       50,000,000us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized
Net asset value per share $ 50.00bno_NetAssetValuePerUnit $ 22.39bno_NetAssetValuePerUnit $ 43.81bno_NetAssetValuePerUnit $ 40.98bno_NetAssetValuePerUnit [1] $ 37.27bno_NetAssetValuePerUnit [1]  
Initial stock units issued 200,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued 450,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued        
Initial Stock Units Outstanding   450,000bno_InitialStockUnitsOutstanding        
Initial Units Value, Issued 10,000,000bno_InitialUnitsValueIssued          
Maximum [Member]            
Net asset value per share   $ 89.92bno_NetAssetValuePerUnit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Initial stock units issued   900,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Initial Stock Units Outstanding   900,000bno_InitialStockUnitsOutstanding
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Minimum [Member]            
Net asset value per share   $ 44.96bno_NetAssetValuePerUnit
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Prior to July 1, 2011 [Member]            
Transaction Fee   $ 1,000bno_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   722us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= bno_IceBrentCrudeOilFuturesCoOneMember
/ us-gaap_InvestmentTypeAxis
= bno_OpenFuturesContractsLongMember		 237us-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.