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v2.4.1.9

Schedule of Investments [Parenthetical] (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Collateral amount on open futures contracts | 9,152,751 bno_CollateralAmountOnOpenFuturesContracts | 3,271,010 bno_CollateralAmountOnOpenFuturesContracts
Cash Equivalents [Member] | U S Treasury Bills 0.05%, 01/15/15 [Member] |  |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005011515Member |
Expiration date | 2015-01-15 |
Cash Equivalents [Member] | U S Treasury Bills 0.05%, 02/26/15 [Member] |  |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005022615Member |
Expiration date | 2015-02-26 |
Cash Equivalents [Member] | U S Treasury Bills 0.05%, 04/23/15 [Member] |  |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005042315Member |
Expiration date | 2015-04-23 |
Cash Equivalents [Member] | U S Treasury Bills 0.07%, 05/21/15 [Member] |  |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills007052115Member |
Expiration date | 2015-05-21 |
Cash Equivalents [Member] | U S Treasury Bills 0.10%, 06/25/15 [Member] |  |
Interest rate | 0.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills010062515Member |
Expiration date | 2015-06-25 |
Cash Equivalents [Member] | U.S. Treasury Bill, 0.07%, 3/27/2014 [Member] |  |
Interest rate |  | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills0073272014Member
Expiration date |  | 2014-03-27
Open Futures Contracts - Long [Member] | ICE Brent Crude Oil Futures CO February 2014 contracts, expiring January 2014 and February 2013 contracts, expiring January 2013 [Member] |  |
Expiration date | January 2015 | January 2014

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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