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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual)	Mar. 31, 2019 shares
Number of Units Per Baskets	50,000
Redemption Baskets [Member]
Number of Units Per Baskets	350

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- 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

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- Details

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