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Statements of Changes in Partners' Capital (USD $)
Total
General Partner
Limited Partners
Beginning Balances at Sep. 01, 2009      
Addition/Initial contribution of capital of 2,800,000 and 200,000 partnership units in 2011 and 2010 respectively $ 1,000 $ 20 $ 980
Net income       
Ending Balances at Dec. 31, 2009 [1] 1,000 20 980
Addition/Initial contribution of capital of 2,800,000 and 200,000 partnership units in 2011 and 2010 respectively 10,000,000   10,000,000
Redemption of initial investment/2,500,000 partnership units in 2011 (1,000) (20) (980)
Net income 2,615,031 [1]   2,615,031
Ending Balances at Dec. 31, 2010 12,615,031   12,615,031
Net Asset Value Per Unit, Ending at Dec. 31, 2010 $ 63.08 $ 63.08  
Addition/Initial contribution of capital of 2,800,000 and 200,000 partnership units in 2011 and 2010 respectively 205,178,034   205,178,034
Redemption of initial investment/2,500,000 partnership units in 2011 (186,969,027)   (186,969,027)
Net income 6,444,350   6,444,350
Ending Balances at Dec. 31, 2011 $ 37,268,388   $ 37,268,388
Net Asset Value Per Unit, Ending at Dec. 31, 2011 $ 74.54 $ 74.54  
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.