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Statements of Changes in Partners' Capital (USD $)
Total
General Partner [Member]
Limited Partner [Member]
Balances at Dec. 31, 2011 $ 37,268,388us-gaap_PartnersCapital $ 0us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 $ 37,268,388us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Net asset value, beginning of year at Dec. 31, 2011 $ 37.27bno_NetAssetValuePerUnit [1] $ 37.27bno_NetAssetValuePerUnit
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 [2]  
Addition of partnership shares 89,087,948us-gaap_PartnersCapitalAccountContributions 0us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 89,087,948us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Redemption of partnership shares (85,693,039)us-gaap_PartnersCapitalAccountRedemptions 0us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 (85,693,039)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Net income (loss) 4,409,324us-gaap_ProfitLoss 0us-gaap_ProfitLoss
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 4,409,324us-gaap_ProfitLoss
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2012 45,072,621us-gaap_PartnersCapital 0us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 45,072,621us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2012 $ 40.98bno_NetAssetValuePerUnit [1] $ 40.98bno_NetAssetValuePerUnit
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 [2]  
Addition of partnership shares 118,483,039us-gaap_PartnersCapitalAccountContributions 0us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 118,483,039us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Redemption of partnership shares (139,527,881)us-gaap_PartnersCapitalAccountRedemptions 0us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 (139,527,881)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Net income (loss) 2,260,564us-gaap_ProfitLoss 0us-gaap_ProfitLoss
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 2,260,564us-gaap_ProfitLoss
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2013 26,288,343us-gaap_PartnersCapital 0us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 26,288,343us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2013 $ 43.81bno_NetAssetValuePerUnit $ 43.81bno_NetAssetValuePerUnit
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		  
Addition of partnership shares 77,749,293us-gaap_PartnersCapitalAccountContributions 0us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 77,749,293us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Redemption of partnership shares (36,166,377)us-gaap_PartnersCapitalAccountRedemptions 0us-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 0us-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 $ 41,419,390us-gaap_PartnersCapital $ 0us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember		 $ 41,419,390us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2014 $ 22.39bno_NetAssetValuePerUnit $ 22.39bno_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.