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Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Gain (loss) on trading of commodity futures contracts:      
Realized gain on closed positions $ 3,239,910 $ 8,052,950 $ 2,352,020 [1]
Change in unrealized gain (loss) on open positions 1,655,900 (1,239,230) 322,660 [1]
Dividend income 10,149 3,457 3,220 [1]
Interest income 5,345 4,586 259 [1]
Other income 10,500 20,050 0 [1]
Total income 4,921,804 6,841,813 2,678,159 [1]
Expenses      
General Partner management fees (Note 3) 391,039 318,548 47,800 [1]
Professional fees 125,339 146,522 122,904 [1]
Brokerage commissions 33,506 31,871 5,718 [1]
Other expenses 9,844 4,953 421 [1]
Total expenses 559,728 501,894 176,843 [1]
Expense waiver (Note 3) (47,248) (104,431) (113,715) [1]
Net expenses 512,480 397,463 63,128 [1]
Net income $ 4,409,324 $ 6,444,350 $ 2,615,031 [1]
Net income per limited partnership unit 7.41 11.46 13.08 [1]
Net income per weighted average limited partnership unit 6.74 11.48 13.08 [1]
Weighted average limited partnership units outstanding 653,825 561,370 200,000 [1]
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.