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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Short-Term Investments | $ 60,987,238 us-gaap_ShortTermInvestments | $ 24,995,470 us-gaap_ShortTermInvestments
Exchange-Traded Futures Contracts Foreign Contracts |  |
Exchange-Traded Futures Contracts Foreign Contracts | (10,535,860)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts | (6,347,090)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts
Fair Value, Inputs, Level 1 [Member] |  |
Short-Term Investments | 60,987,238 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 24,995,470 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Exchange-Traded Futures Contracts Foreign Contracts |  |
Exchange-Traded Futures Contracts Foreign Contracts | (10,535,860)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | (6,347,090)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] |  |
Short-Term Investments | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Exchange-Traded Futures Contracts Foreign Contracts |  |
Exchange-Traded Futures Contracts Foreign Contracts | 0 bno_UnrealizedGainLossOnOpenCommodityFuturesContracts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 bno_UnrealizedGainLossOnOpenCommodityFuturesContracts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] |  |
Short-Term Investments | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Exchange-Traded Futures Contracts Foreign Contracts |  |
Exchange-Traded Futures Contracts Foreign Contracts | $ 0 bno_UnrealizedGainLossOnOpenCommodityFuturesContracts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0 bno_UnrealizedGainLossOnOpenCommodityFuturesContracts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Unrealized gain (loss) on open commodity futures contracts. + References No definition available. + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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