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FINANCIAL HIGHLIGHTS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 02, 2010
Per Unit Operating Performance:        
Net asset value, beginning of year $ 74.54 $ 63.08 $ 50.00 [1] $ 50.00
Total income (loss) $ 8.19 $ 12.17 $ 13.40 [1]  
Net expenses $ (0.78) $ (0.71) $ (0.32) [1]  
Net increase in net asset value $ 7.41 $ 11.46 $ 13.08 [1]  
Net asset value, end of year $ 81.95 $ 74.54 $ 63.08 $ 50.00
Total Return 9.94% 18.17% 26.16% [1]  
Ratios to Average Net Assets        
Total income (loss) 9.44% 16.11% 24.52% [1]  
Management fees 0.75% 0.75% 0.75% [1],[2]  
Total expenses excluding management fees 0.32% 0.43% 2.02% [1],[2]  
Expenses waived (0.09%) (0.24%) (1.78%) [1],[2]  
Net expenses excluding management fees 0.23% 0.19% 0.24% [1],[2]  
Net income (loss) 8.46% 15.17% 23.94% [1]  
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.
[2] Annualized