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FINANCIAL HIGHLIGHTS (Tables)
 12 Months Ended
Dec. 31, 2012
Supplemental Financial Information Disclosure [Abstract]  
Schedule Of Per Unit Peformance Data and Other Financial Data [Table Text Block]

The following table presents per unit performance data and other supplemental financial data for the years ended December 31, 2012 and 2011 and 2010.  This information has been derived from information presented in the financial statements.

 

    Year ended
December 31,
2012		     Year ended
December 31,
2011		     Year ended
December 31,
2010*		  
Per Unit Operating Performance:                        
                         
Net asset value, beginning of year   $ 74.54     $ 63.08     $ 50.00  
Total income (loss)     8.19       12.17       13.40  
Net expenses     (0.78 )     (0.71 )     (0.32 )
Net increase in net asset value     7.41       11.46       13.08  
Net asset value, end of year   $ 81.95     $ 74.54     $ 63.08  
                         
Total Return     9.94 %     18.17 %     26.16 %
                         
Ratios to Average Net Assets                        
Total income (loss)     9.44 %     16.11 %     24.52 %
Management fees     0.75 %     0.75 %     0.75 %**
Total expenses excluding management fees     0.32 %     0.43 %     2.02 %**
Expenses waived     (0.09 )%     (0.24 )%     (1.78 )%**
Net expenses excluding management fees     0.23 %     0.19 %     0.24 %**
Net income (loss)     8.46 %     15.17 %     23.94 %

 

* The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.
** Annualized.