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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 | $ 2,043,322 us-gaap_Revenues | $ (369,412)us-gaap_Revenues | $ 1,205,810 us-gaap_Revenues | $ 3,544,437 us-gaap_Revenues | $ (2,878,492)us-gaap_Revenues |  | $ 786,724 us-gaap_Revenues |  | $ (26,099,282)us-gaap_Revenues | $ 2,658,479 us-gaap_Revenues | $ 4,921,804 us-gaap_Revenues |
Total Expenses | 135,811 us-gaap_OperatingExpenses | 144,367 us-gaap_OperatingExpenses | 124,594 us-gaap_OperatingExpenses | 96,419 us-gaap_OperatingExpenses | 107,271 us-gaap_OperatingExpenses | 125,487 us-gaap_OperatingExpenses | 123,951 us-gaap_OperatingExpenses |  | 121,859 us-gaap_OperatingExpenses |  | 501,191 us-gaap_OperatingExpenses | 478,568 us-gaap_OperatingExpenses | 559,728 us-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 | 82,231 bno_NetOperatingExpenses | 107,048 bno_NetOperatingExpenses | 97,630 bno_NetOperatingExpenses | 65,678 bno_NetOperatingExpenses | 77,095 bno_NetOperatingExpenses | 104,529 bno_NetOperatingExpenses | 109,300 bno_NetOperatingExpenses |  | 106,991 bno_NetOperatingExpenses |  |  |  |  |
Net Income (Loss) | $ (18,982,757)us-gaap_NetIncomeLoss | $ (8,979,714)us-gaap_NetIncomeLoss | $ 1,945,692 us-gaap_NetIncomeLoss | $ (435,090)us-gaap_NetIncomeLoss | $ 1,128,715 us-gaap_NetIncomeLoss | $ 3,439,908 us-gaap_NetIncomeLoss | $ (2,987,792)us-gaap_NetIncomeLoss |  | $ 679,733 us-gaap_NetIncomeLoss |  | $ (26,451,869)us-gaap_NetIncomeLoss | $ 2,260,564 us-gaap_NetIncomeLoss | $ 4,409,324 us-gaap_NetIncomeLoss |
Net Income (Loss) per Share | $ (15.33)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (7.63)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 2.29 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (0.75)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.42 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 3.51 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (2.75)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1] | $ 0.66 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1] | $ (21.42)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 2.83 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 3.71 us-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.

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