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Condensed Statements of Financial Condition (USD $)
Mar. 31, 2015
Dec. 31, 2014
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 98,111,818us-gaap_CashAndCashEquivalentsAtCarryingValue $ 36,408,502us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity in trading accounts:    
Cash and cash equivalents 17,978,914us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 9,152,751us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Unrealized gain (loss) on open commodity futures contracts (10,535,860)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts (6,347,090)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts
Receivable for shares sold 3,071,272us-gaap_AccruedInvestmentIncomeReceivable 2,250,175us-gaap_AccruedInvestmentIncomeReceivable
Receivable from General Partner (Note 3) 27,725us-gaap_DueFromOfficersOrStockholders 94,364us-gaap_DueFromOfficersOrStockholders
Dividends receivable 340us-gaap_DividendsReceivable 26us-gaap_DividendsReceivable
Directors' fees and insurance receivable 1,502us-gaap_AccountsReceivableRelatedParties 0us-gaap_AccountsReceivableRelatedParties
ETF transaction fees receivable 0us-gaap_OtherReceivables 700us-gaap_OtherReceivables
Total assets 108,655,711us-gaap_Assets 41,559,428us-gaap_Assets
Liabilities and Partners' Capital    
General Partner management fees payable (Note 3) 65,119us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent 22,178us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent
Professional fees payable 67,723us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 115,836us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Brokerage commissions payable 4,546us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations 1,686us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations
Directors' fees and insurance payable 0us-gaap_ManagementFeePayable 338us-gaap_ManagementFeePayable
Total liabilities 137,388us-gaap_Liabilities 140,038us-gaap_Liabilities
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0us-gaap_GeneralPartnersCapitalAccount 0us-gaap_GeneralPartnersCapitalAccount
Limited Partners 108,518,323us-gaap_LimitedPartnersCapitalAccount 41,419,390us-gaap_LimitedPartnersCapitalAccount
Total Partners' Capital 108,518,323us-gaap_PartnersCapital 41,419,390us-gaap_PartnersCapital
Total liabilities and partners' capital $ 108,655,711us-gaap_LiabilitiesAndStockholdersEquity $ 41,559,428us-gaap_LiabilitiesAndStockholdersEquity
Limited Partners' shares outstanding 5,300,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 1,850,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net asset value per share $ 20.48bno_NetAssetValuePerUnit $ 22.39bno_NetAssetValuePerUnit
Market value per share $ 20.50bno_MarketValuePerUnit $ 22.70bno_MarketValuePerUnit