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Fair Value Of Financial Instruments (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Line Items]
Derivatives not Accounted for as Hedging Instruments	Futures - Commodity Contracts
Condensed Statements of Financial Condition Location	Assets
Fair value	$ (6,347,090)bno_UnrealizedGainLossOnOpenCommodityFuturesContracts	$ 28,670bno_UnrealizedGainLossOnOpenCommodityFuturesContracts

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Unrealized gain (loss) on open commodity futures contracts.

+ References

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- Definition

Description of the type of derivative instrument identified. For example, swaps, swaptions, forwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

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Description of where the foreign currency derivatives not designated as hedging instruments are reported in the balance sheet.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Paragraph 4B

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-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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