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FINANCIAL HIGHLIGHTS (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 02, 2010
Per Unit Operating Performance:      
Net asset value, beginning of period $ 40.98 [1],[2],[3] $ 37.27 [1] $ 50.00
Total income $ 1.71 $ 3.62 [1]  
Total expenses $ (0.30) $ (0.29) [1]  
Net decrease in net asset value $ 1.41 $ 3.33 [1]  
Net asset value, end of period $ 42.39 $ 40.60 [1] $ 50.00
Total Return 3.44% 8.93%  
Ratios to Average Net Assets      
Total income 3.36% 8.40%  
Management fees 0.75% [4] 0.75% [4]  
Total expenses excluding management fees 0.40% [4] 0.30% [4]  
Expenses waived (0.16%) [4] (0.07%) [4]  
Net expenses excluding management fees 0.24% [4] 0.23% [4]  
Net income (loss) 2.62% 7.66%  
[1] On August 26, 2013, USBO executed a 2-for-1 forward unit split for all unitholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward unit split was payable after the close of markets on August 28, 2013. USBO began trading at its post split price on August 29, 2013. The Financial Highlights (Unaudited) have been adjusted for the periods shown to reflect the 2-for-1 forward unit split on a retroactive basis.
[2] On August 26, 2013, the United States Brent Oil Fund, LP executed a 2-for-1 forward unit split for all unitholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward unit split was payable after the close of markets on August 28, 2013. United States Brent Oil Fund, LP began trading its post-unit split price on August 29, 2013. Historical units outstanding, net asset value per unit and market value per unit have been adjusted to reflect the 2-for-1 forward unit split on a retroactive basis.
[3] On August 26, 2013, the United States Brent Oil Fund, LP executed a 2-for-1 forward unit split for all unitholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward unit split was payable after the close of markets on August 28, 2013. United States Brent Oil Fund, LP began trading at its post split price on August 29, 2013. The Condensed Statement of Changes in Partners’ Capital (Unaudited) has been adjusted for the period to reflect the 2-for-1 forward unit split on a retroactive basis.
[4] Annualized.