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Statements of Operations (USD $)
 4 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Gain (loss) on trading of commodity futures contracts:      
Realized gain on closed positions    $ 8,052,950 $ 2,352,020 [1]
Change in unrealized gain (loss) on open positions   (1,239,230) 322,660 [1]
Dividend income   3,457 3,220 [1]
Interest income   4,586 259 [1]
Other income   20,050  
Total income    6,841,813 2,678,159 [1]
Expenses      
General Partners management fees (Note 3)   318,548 47,800 [1]
Professional fees   146,522 122,904 [1]
Brokerage commissions   31,871 5,718 [1]
Other expenses   4,953 421 [1]
Total expenses   501,894 176,843 [1]
Expense waiver (Note 3)   (104,431) (113,715) [1]
Net expenses   397,463 63,128 [1]
Net income    $ 6,444,350 $ 2,615,031 [1]
Net income per limited partnership unit   11.46 13.08 [1]
Net income per weighted average limited partnership unit   11.48 13.08 [1]
Weighted average limited partnership units outstanding   561,370 200,000 [1]
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.