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Quarterly Financial Data (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Data [Line Items]                      
Total Income (Loss) $ (18,900,526)us-gaap_Revenues $ (8,872,666)us-gaap_Revenues $ 2,043,322us-gaap_Revenues $ (369,412)us-gaap_Revenues $ 1,205,810us-gaap_Revenues $ 3,544,437us-gaap_Revenues $ (2,878,492)us-gaap_Revenues $ 786,724us-gaap_Revenues $ (26,099,282)us-gaap_Revenues $ 2,658,479us-gaap_Revenues $ 4,921,804us-gaap_Revenues
Total Expenses 135,811us-gaap_OperatingExpenses 144,367us-gaap_OperatingExpenses 124,594us-gaap_OperatingExpenses 96,419us-gaap_OperatingExpenses 107,271us-gaap_OperatingExpenses 125,487us-gaap_OperatingExpenses 123,951us-gaap_OperatingExpenses 121,859us-gaap_OperatingExpenses 501,191us-gaap_OperatingExpenses 478,568us-gaap_OperatingExpenses 559,728us-gaap_OperatingExpenses
Expense Waivers (53,580)bno_ExpenseWaiver (37,319)bno_ExpenseWaiver (26,964)bno_ExpenseWaiver (30,741)bno_ExpenseWaiver (30,176)bno_ExpenseWaiver (20,958)bno_ExpenseWaiver (14,651)bno_ExpenseWaiver (14,868)bno_ExpenseWaiver (148,604)bno_ExpenseWaiver (80,653)bno_ExpenseWaiver (47,248)bno_ExpenseWaiver
Net Expenses 82,231bno_NetOperatingExpenses 107,048bno_NetOperatingExpenses 97,630bno_NetOperatingExpenses 65,678bno_NetOperatingExpenses 77,095bno_NetOperatingExpenses 104,529bno_NetOperatingExpenses 109,300bno_NetOperatingExpenses 106,991bno_NetOperatingExpenses      
Net Income (Loss) $ (18,982,757)us-gaap_NetIncomeLoss $ (8,979,714)us-gaap_NetIncomeLoss $ 1,945,692us-gaap_NetIncomeLoss $ (435,090)us-gaap_NetIncomeLoss $ 1,128,715us-gaap_NetIncomeLoss $ 3,439,908us-gaap_NetIncomeLoss $ (2,987,792)us-gaap_NetIncomeLoss $ 679,733us-gaap_NetIncomeLoss $ (26,451,869)us-gaap_NetIncomeLoss $ 2,260,564us-gaap_NetIncomeLoss $ 4,409,324us-gaap_NetIncomeLoss
Net Income (Loss) per Share $ (15.33)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ (7.63)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 2.29us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ (0.75)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 1.42us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 3.51us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ (2.75)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [1] $ 0.66us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [1] $ (21.42)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 2.83us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 3.71us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2]
[1] Adjusted to give effect to the forward share split of 2-for-1 paid after close of markets on August 28, 2013.
[2] 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.