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Statements of Financial Condition (USD $)
Dec. 31, 2014
Dec. 31, 2013
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 36,408,502us-gaap_CashAndCashEquivalentsAtCarryingValue $ 25,257,312us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity in trading accounts:    
Cash and cash equivalents 9,152,751us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 3,271,010us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Unrealized gain (loss) on open commodity futures contracts (6,347,090)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts 28,670bno_UnrealizedGainLossOnOpenCommodityFuturesContracts
Receivable for shares sold 2,250,175us-gaap_AccruedInvestmentIncomeReceivable 0us-gaap_AccruedInvestmentIncomeReceivable
Receivable from General Partner (Note 3) 94,364us-gaap_DueFromOfficersOrStockholders 80,653us-gaap_DueFromOfficersOrStockholders
Dividends receivable 26us-gaap_DividendsReceivable 584us-gaap_DividendsReceivable
ETF transaction fees receivable 700us-gaap_OtherReceivables 350us-gaap_OtherReceivables
Total assets 41,559,428us-gaap_Assets 28,638,579us-gaap_Assets
Liabilities and Partners' Capital    
Payable for shares redeemed 0us-gaap_TradingLiabilities 2,190,654us-gaap_TradingLiabilities
General Partner management fees payable (Note 3) 22,178us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent 18,110us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent
Professional fees payable 115,836us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 140,442us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Brokerage commissions payable 1,686us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations 821us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations
Directors' fees and insurance payable 338us-gaap_ManagementFeePayable 209us-gaap_ManagementFeePayable
Total liabilities 140,038us-gaap_Liabilities 2,350,236us-gaap_Liabilities
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0us-gaap_GeneralPartnersCapitalAccount 0us-gaap_GeneralPartnersCapitalAccount
Limited Partners 41,419,390us-gaap_LimitedPartnersCapitalAccount 26,288,343us-gaap_LimitedPartnersCapitalAccount
Total Partners' Capital 41,419,390us-gaap_PartnersCapital 26,288,343us-gaap_PartnersCapital
Total liabilities and partners' capital $ 41,559,428us-gaap_LiabilitiesAndStockholdersEquity $ 28,638,579us-gaap_LiabilitiesAndStockholdersEquity
Limited Partners' shares outstanding 1,850,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 600,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net asset value per share $ 22.39bno_NetAssetValuePerUnit $ 43.81bno_NetAssetValuePerUnit
Market value per share $ 22.70bno_MarketValuePerUnit $ 44.54bno_MarketValuePerUnit