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ORGANIZATION AND BUSINESS (Details Textual) (USD $)
 1 Months Ended 3 Months Ended
Jun. 02, 2010
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
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           50,000,000bno_InitiallyRegisteredUnitsOfEntityWithSec
Net asset value per unit $ 50.00bno_NetAssetValuePerUnit $ 20.48bno_NetAssetValuePerUnit $ 22.39bno_NetAssetValuePerUnit $ 43.06bno_NetAssetValuePerUnit $ 43.81bno_NetAssetValuePerUnit  
Initial stock units issued 200,000bno_InitialStockUnitsIssued          
Initial Units Value, Issued $ 10,000,000bno_InitialUnitsValueIssued          
Total Units Registered Of Entity   50,000,000bno_TotalUnitsRegisteredOfEntity        
ICE Brent Crude Oil Futures C0 May 2015 contracts, expiring April 15, 2015 [Member]            
Number of Contracts   1,969us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentSecuritiesSeriesAxis
= bno_IceBrentCrudeOilFuturesC0May2015ContractsExpiringApril152015Member