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Statements of Changes in Partners' Capital (USD $) | Total | General Partner [Member] | Limited Partner [Member]
--- | --- | --- | ---
Balances at Dec. 31, 2011 | $ 37,268,388 us-gaap_PartnersCapital |  | $ 0 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | $ 37,268,388 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net asset value, beginning of year at Dec. 31, 2011 | $ 37.27 bno_NetAssetValuePerUnit | [1] | $ 37.27 bno_NetAssetValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | [2] |
Addition of partnership shares | 89,087,948 us-gaap_PartnersCapitalAccountContributions |  | 0 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 89,087,948 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares | (85,693,039)us-gaap_PartnersCapitalAccountRedemptions |  | 0 us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (85,693,039)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net income (loss) | 4,409,324 us-gaap_ProfitLoss |  | 0 us-gaap_ProfitLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 4,409,324 us-gaap_ProfitLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2012 | 45,072,621 us-gaap_PartnersCapital |  | 0 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 45,072,621 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2012 | $ 40.98 bno_NetAssetValuePerUnit | [1] | $ 40.98 bno_NetAssetValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | [2] |
Addition of partnership shares | 118,483,039 us-gaap_PartnersCapitalAccountContributions |  | 0 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 118,483,039 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares | (139,527,881)us-gaap_PartnersCapitalAccountRedemptions |  | 0 us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (139,527,881)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net income (loss) | 2,260,564 us-gaap_ProfitLoss |  | 0 us-gaap_ProfitLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 2,260,564 us-gaap_ProfitLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2013 | 26,288,343 us-gaap_PartnersCapital |  | 0 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 26,288,343 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2013 | $ 43.81 bno_NetAssetValuePerUnit |  | $ 43.81 bno_NetAssetValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |
Addition of partnership shares | 77,749,293 us-gaap_PartnersCapitalAccountContributions |  | 0 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 77,749,293 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares | (36,166,377)us-gaap_PartnersCapitalAccountRedemptions |  | 0 us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (36,166,377)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net income (loss) | (26,451,869)us-gaap_ProfitLoss |  | 0 us-gaap_ProfitLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (26,451,869)us-gaap_ProfitLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2014 | $ 41,419,390 us-gaap_PartnersCapital |  | $ 0 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | $ 41,419,390 us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2014 | $ 22.39 bno_NetAssetValuePerUnit |  | $ 22.39 bno_NetAssetValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |
[1] | On August 26, 2013, BNO 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. BNO began trading at its post split price on August 29, 2013. The Financial Highlights have been adjusted for the periods shown to reflect the 2-for-1 forward share split on a retroactive basis.
[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 Changes in Partners’ Capital have been adjusted for the period shown to reflect the 2-for-1 forward share split on a retroactive basis.

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