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Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed positions $ (19,750,710)us-gaap_TradingSecuritiesRealizedGainLoss $ 3,338,310us-gaap_TradingSecuritiesRealizedGainLoss $ 3,239,910us-gaap_TradingSecuritiesRealizedGainLoss
Change in unrealized gain (loss) on open positions (6,375,760)us-gaap_UnrealizedGainLossOnDerivatives (710,660)us-gaap_UnrealizedGainLossOnDerivatives 1,655,900us-gaap_UnrealizedGainLossOnDerivatives
Realized gain (loss) on short-term investments 17us-gaap_GainLossOnInvestments 0us-gaap_GainLossOnInvestments 0us-gaap_GainLossOnInvestments
Dividend income 1,252us-gaap_DividendIncomeOperating 6,856us-gaap_DividendIncomeOperating 10,149us-gaap_DividendIncomeOperating
Interest income 10,869us-gaap_InterestIncomeOperating 5,073us-gaap_InterestIncomeOperating 5,345us-gaap_InterestIncomeOperating
ETF transaction fees 15,050us-gaap_OtherIncome 18,900us-gaap_OtherIncome 10,500us-gaap_OtherIncome
Total income (loss) (26,099,282)us-gaap_Revenues 2,658,479us-gaap_Revenues 4,921,804us-gaap_Revenues
Expenses      
General Partner management fees (Note 3) 286,806us-gaap_AssetManagementCosts 299,440us-gaap_AssetManagementCosts 391,039us-gaap_AssetManagementCosts
Professional fees 178,177us-gaap_ProfessionalFees 140,442us-gaap_ProfessionalFees 125,339us-gaap_ProfessionalFees
Brokerage commissions 27,058us-gaap_FloorBrokerageExchangeAndClearanceFees 29,674us-gaap_FloorBrokerageExchangeAndClearanceFees 33,506us-gaap_FloorBrokerageExchangeAndClearanceFees
Directors' fees and insurance 9,150us-gaap_NoninterestExpenseDirectorsFees 9,012us-gaap_NoninterestExpenseDirectorsFees 9,844us-gaap_NoninterestExpenseDirectorsFees
Total expenses 501,191us-gaap_OperatingExpenses 478,568us-gaap_OperatingExpenses 559,728us-gaap_OperatingExpenses
Expense waiver (Note 3) (148,604)bno_ExpenseWaiver (80,653)bno_ExpenseWaiver (47,248)bno_ExpenseWaiver
Net expenses 352,587bno_TotalExpensesNetOfExpenseWaiver 397,915bno_TotalExpensesNetOfExpenseWaiver 512,480bno_TotalExpensesNetOfExpenseWaiver
Net income (loss) $ (26,451,869)us-gaap_NetIncomeLoss $ 2,260,564us-gaap_NetIncomeLoss $ 4,409,324us-gaap_NetIncomeLoss
Net income (loss) per limited partnership share $ (21.42)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 2.83us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 3.71us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [1]
Net income (loss) per weighted average limited partnership share $ (26.86)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted $ 2.35us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted $ 3.37us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [1]
Weighted average limited partnership shares outstanding 984,795us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 963,425us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 1,307,650us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding [1]
[1] On August 26, 2013, the United States Brent Oil Fund, LP 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. United States Brent Oil Fund, LP began trading its post-share split price on August 29, 2013. The Statements of Operations have been adjusted for the period shown to reflect the 2-for-1 forward share split on a retroactive basis.