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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
FAIR VALUE OF FINANCIAL INSTRUMENTS
Futures - Commodity Contracts	$ (6,631,410)	$ (6,289,510)

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- Definition

Unrealized gain (loss) on open commodity futures contracts.

+ References

No definition available.

+ Details

Name:	bno_UnrealizedGainLossOnOpenCommodityFuturesContracts
Namespace Prefix:	bno_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration