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Organization And Business (Details Textual) (USD $)
 1 Months Ended 12 Months Ended
Feb. 29, 2012
Jun. 02, 2010
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 31, 2010
Units Issued During Period To Authorized Purchasers Through Distributors 50,000            
Units Issued During Period To Authorized Purchasers Through Marketing Agent 100,000            
Transaction Fee     $ 350        
Initially Registered Units Of Entity With Sec             50,000,000
Net asset value per share   $ 50.00 [1] $ 43.81 $ 40.98 [1],[2] $ 37.27 [1],[2] $ 31.54 [1],[2]  
Initial stock units issued   200,000 450,000        
Initial Stock Units Outstanding     450,000        
Initial Units Value, Issued   10,000,000          
Total Units Registered Of Entity     50,000,000        
Maximum [Member]
              
Net asset value per share     $ 89.92        
Initial stock units issued     900,000        
Initial Stock Units Outstanding     900,000        
Minimum [Member]
              
Net asset value per share     $ 44.96        
Prior to July 1, 2011 [Member]
              
Transaction Fee     $ 1,000        
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures CO February 2014 contracts, expiring January 2014 and February 2013 contracts, expiring January 2013 [Member]
              
Number of Contracts     237 [3] 406 [4]      
[1] 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 Financial Condition have been adjusted for the period shown to reflect the 2-for-1 forward share split on a retroactive basis.
[2] 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.
[3] Collateral amounted to $3,271,010 on open futures contracts.
[4] Collateral amounted to $4,934,188 on open futures contracts.