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Document And Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 23, 2015
Jun. 30, 2014
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol BNO    
Entity Common Stock, Shares Outstanding   5,050,000dei_EntityCommonStockSharesOutstanding  
Entity Registrant Name United States Brent Oil Fund, LP    
Entity Central Index Key 0001472494    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 54,444,000dei_EntityPublicFloat