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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities:      
Net income $ 4,409,324 $ 6,444,350 $ 2,615,031 [1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
(Increase) decrease in commodity futures trading account - cash and cash equivalents 3,366,714 (5,131,599) (3,169,218) [1]
Unrealized (gain) loss on futures contracts (1,655,900) 1,239,230 (322,660) [1]
(Increase) decrease in receivable from General Partner 57,183 9,284 (113,715) [1]
Increase in dividend receivable (696) (54) (286) [1]
(Increase) decrease in interest receivable 11 (11) 0 [1]
Increase in other assets (549) (278) 0 [1]
Increase (decrease) in professional fees payable (21,183) 23,618 122,904 [1]
Increase (decrease) in General Partner management fees payable (5,637) 26,107 7,803 [1]
Increase in brokerage commissions payable 305 500 416 [1]
Increase (decrease) in other liabilities (168) 1,076 201 [1]
Net cash provided by (used in) operating activities 6,149,404 2,612,223 (859,524) [1]
Cash Flows from Financing Activities:      
Addition of partnership units 89,087,948 205,178,034 10,000,000 [1]
Redemption of partnership units (85,693,039) (186,969,027) (1,000) [1]
Net cash provided by financing activities 3,394,909 18,209,007 9,999,000 [1]
Net Increase in Cash and Cash Equivalents 9,544,313 20,821,230 9,139,476 [1]
Cash and Cash Equivalents, beginning of year 29,961,706 9,140,476 1,000 [1]
Cash and Cash Equivalents, end of year $ 39,506,019 $ 29,961,706 $ 9,140,476
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.