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Contracts And Agreements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Brokerage commissions	$ 27,058us-gaap_FloorBrokerageExchangeAndClearanceFees	$ 29,674us-gaap_FloorBrokerageExchangeAndClearanceFees	$ 33,506us-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	24,246us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember	24,097us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_RebalancingInvestmentsTransactionMember	29,561us-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	$ 2,812us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember	$ 5,577us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = bno_TradesNecessitatedByCreationAndRedemptionActivityMember	$ 3,945us-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

Percentage Of Average Daily Net Assets.

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X

- 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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