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ORGANIZATION AND BUSINESS (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 02, 2010 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | May 31, 2010
Units Issued During Period To Authorized Purchasers Through Distributors |  | 50,000 bno_UnitsIssuedDuringPeriodToAuthorizedPurchasersThroughDistributors |  |  |  |
Transaction Fee |  | $ 350 bno_TransactionFee |  |  |  |
Initially Registered Units Of Entity With Sec |  |  |  |  |  | 50,000,000 bno_InitiallyRegisteredUnitsOfEntityWithSec
Net asset value per unit | $ 50.00 bno_NetAssetValuePerUnit | $ 20.48 bno_NetAssetValuePerUnit | $ 22.39 bno_NetAssetValuePerUnit | $ 43.06 bno_NetAssetValuePerUnit | $ 43.81 bno_NetAssetValuePerUnit |
Initial stock units issued | 200,000 bno_InitialStockUnitsIssued |  |  |  |  |
Initial Units Value, Issued | $ 10,000,000 bno_InitialUnitsValueIssued |  |  |  |  |
Total Units Registered Of Entity |  | 50,000,000 bno_TotalUnitsRegisteredOfEntity |  |  |  |
ICE Brent Crude Oil Futures C0 May 2015 contracts, expiring April 15, 2015 [Member] |  |  |  |  |  |
Number of Contracts |  | 1,969 us-gaap_InvestmentOwnedBalanceContracts / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesC0May2015ContractsExpiringApril152015Member |  |  |  |

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- Definition Balance held at close of period in number of contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column B -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Article 12 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column B -Article 12 + Details
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