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Summary Of Significant Accounting Policies (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2014
Number of Units Per Baskets	50,000
Transaction Fee	$ 350

X

- Definition

Number of Units Per Baskets.

+ References

No definition available.

+ Details

Name:	bno_NumberOfUnitsPerBaskets
Namespace Prefix:	bno_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

A description of what the Transaction fee during the period.

+ References

No definition available.

+ Details

Name:	bno_TransactionFee
Namespace Prefix:	bno_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration