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CONTRACTS AND AGREEMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Brokerage commissions	$ 25,577us-gaap_FloorBrokerageExchangeAndClearanceFees	$ 4,109us-gaap_FloorBrokerageExchangeAndClearanceFees
Percentage Of Average Daily Net Assets	0.13%bno_PercentageOfAverageDailyNetAssets	0.06%bno_PercentageOfAverageDailyNetAssets
Rebalancing Investments Transaction [Member]
Brokerage commissions	22,561us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember	3,702us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember
Percentage Of Average Daily Net Assets	88.21%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember	90.09%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember
Creation And Redemption Activity [Member]
Brokerage commissions	$ 3,016us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember	$ 407us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember
Percentage Of Average Daily Net Assets	11.79%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember	9.91%bno_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember

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- Definition

Percentage Of Average Daily Net Assets

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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.

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