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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 1) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Futures - Commodity Contracts | $ 51,770 | $ (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