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Document And Entity Information (USD $)
 12 Months Ended
Dec. 31, 2012
Mar. 21, 2013
Jun. 30, 2012
Entity Registrant Name United States Brent Oil Fund, LP    
Entity Central Index Key 0001472494    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Trading Symbol BNO    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2012    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2012    
Entity Voluntary Filers No    
Entity Well-Known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   550,000  
Entity Public Float     $ 44,973,500