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Statements of Cash Flows (USD $)
 4 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities:      
Net income    $ 6,444,350 $ 2,615,031 [1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Increase in commodity futures trading account - cash and cash equivalents   (5,131,599) (3,169,218) [1]
Unrealized (gain) loss on futures contracts   1,239,230 (322,660) [1]
(Increase) decrease in receivable from General Partner   9,284 (113,715) [1]
Increase in dividend receivable   (54) (286) [1]
Increase in interest receivable   (11)  
Increase in other assets   (278)  
Increase in professional fees payable   23,618 122,904 [1]
Increase in General Partner management fees payable   26,107 7,803 [1]
Increase in brokerage commissions payable   500 416 [1]
Increase in other liabilities   1,076 201 [1]
Net cash provided by (used in) operating activities   2,612,223 (859,524) [1]
Cash Flows from Financing Activities:      
Addition of partnership units 1,000 205,178,034 10,000,000 [1]
Redemption of partnership units   (186,969,027) (1,000) [1]
Net cash provided by financing activities 1,000 18,209,007 9,999,000 [1]
Net Increase in Cash and Cash Equivalents 1,000 20,821,230 9,139,476 [1]
Cash and Cash Equivalents, beginning of year/period   9,140,476 [1] 1,000 [1]
Cash and Cash Equivalents, end of year/period $ 1,000 [1] $ 29,961,706 $ 9,140,476 [1]
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.