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Contracts And Agreements (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Brokerage commissions | $ 27,058 us-gaap_FloorBrokerageExchangeAndClearanceFees | $ 29,674 us-gaap_FloorBrokerageExchangeAndClearanceFees | $ 33,506 us-gaap_FloorBrokerageExchangeAndClearanceFees
Percentage Of Average Daily Net Assets | 0.07%bno_PercentageOfAverageDailyNetAssets | 0.07%bno_PercentageOfAverageDailyNetAssets | 0.06%bno_PercentageOfAverageDailyNetAssets
Rebalancing Investments Transaction [Member] |  |  |
Brokerage commissions | 24,246 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember | 24,097 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember | 29,561 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember
Percentage Of Average Daily Net Assets | 89.61%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember | 81.21%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember | 88.23%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember
Creation And Redemption Activity [Member] |  |  |
Brokerage commissions | $ 2,812 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember | $ 5,577 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember | $ 3,945 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember
Percentage Of Average Daily Net Assets | 10.39%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember | 18.79%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember | 11.77%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember

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- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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