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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Futures - Commodity Contracts | $ 5,527,370 | $ (6,289,510)

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- Definition Unrealized gain (loss) on open commodity futures contracts. + References No definition available. + Details
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Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
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