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Statements of Changes in Partners' Capital (USD $)
General Partner [Member]
Limited Partner [Member]
Total
Balances at Dec. 31, 2009 [1] $ 20 $ 980 $ 1,000
Net asset value, beginning of year at Dec. 31, 2009 [1]     $ 50.00
Addition of partnership units 0 10,000,000 10,000,000
Redemption of initial investment (20) (980) (1,000)
Net income 0 2,615,031 2,615,031
Balances at Dec. 31, 2010 0 12,615,031 12,615,031
Net asset value, end of year at Dec. 31, 2010     $ 63.08
Addition of partnership units 0 205,178,034 205,178,034
Redemption of initial investment 0 (186,969,027) (186,969,027)
Net income 0 6,444,350 6,444,350
Balances at Dec. 31, 2011 0 37,268,388 37,268,388
Net asset value, end of year at Dec. 31, 2011     $ 74.54
Addition of partnership units 0 89,087,948 89,087,948
Redemption of initial investment 0 (85,693,039) (85,693,039)
Net income 0 4,409,324 4,409,324
Balances at Dec. 31, 2012 $ 0 $ 45,072,621 $ 45,072,621
Net asset value, end of year at Dec. 31, 2012     $ 81.95
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.