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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual)	12 Months Ended
	Dec. 31, 2017 USD ($) shares
Number of Units Per Baskets | shares	50,000
Transaction Fee	$ 350
Redemption Baskets [Member]
Transaction Fee	$ 350

X

- Definition

Number of Units Per Baskets.

+ References

No definition available.

+ Details

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Namespace Prefix:	bno_
Data Type:	xbrli:sharesItemType
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

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=bno_RedemptionBasketsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: