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Statements of Financial Condition (USD $)
Dec. 31, 2011
Dec. 31, 2010
Assets    
Cash and cash equivalents (Note 5) $ 29,961,706 $ 9,140,476 [1]
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 8,300,817 3,169,218
Unrealized gain (loss) on open commodity futures contracts (916,570) 322,660
Receivable from General Partner (Note 3) 104,431 113,715
Dividend receivable 340 286
Interest receivable 11  
Other assets 278  
Total assets 37,451,013 12,746,355
Liabilities and Partners' Capital    
Professional fees payable 146,522 122,904
General Partner management fees payable (Note 3) 33,910 7,803
Brokerage commissions payable 916 416
Other liabilities 1,277 201
Total liabilities 182,625 131,324
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner      
Limited Partners 37,268,388 12,615,031
Total Partners' Capital 37,268,388 12,615,031
Total liabilities and partners' capital $ 37,451,013 $ 12,746,355
Limited Partners' units outstanding 500,000 200,000
Net asset value per unit $ 74.54 $ 63.08
Market value per unit $ 74.64 $ 62.45
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.