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Financial Highlights (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 02, 2010
Per Unit Operating Performance:        
Net asset value, beginning of year $ 40.98 [1],[2] $ 37.27 [1],[2] $ 31.54 [1],[2] $ 50.00 [1]
Total income $ 3.24 $ 4.10 [2] $ 6.08 [2]  
Net expenses $ (0.41) $ (0.39) [2] $ (0.35) [2]  
Net increase in net asset value $ 2.83 $ 3.71 [2] $ 5.73 [2]  
Net asset value, end of year $ 43.81 $ 40.98 [1],[2] $ 37.27 [1],[2] $ 50.00 [1]
Total Return 6.91% 9.95% 18.17%  
Ratios to Average Net Assets        
Total income 6.66% 9.44% 16.11%  
Management fees 0.75% 0.75% 0.75%  
Total expenses excluding management fees 0.45% 0.32% 0.43%  
Expenses waived (0.20%) (0.09%) (0.24%)  
Net expenses excluding management fees 0.25% 0.23% 0.19%  
Net income 5.66% 8.46% 15.17%  
[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.