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Schedule of Investments (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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% of Partners' Capital | 60.35%bno_PercentageOfPartnersCapital |  | 45.69%bno_PercentageOfPartnersCapital |
Market Value | $ 24,995,470 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue |  | $ 12,010,110 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue |
Cash Equivalents [Member] | US Treasury Securities [Member] | U S Treasury Bills 0.05%, 01/15/15 [Member] |  |  |  |
% of Partners' Capital | 12.07%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005011515Member |  |  |
Principal Amount | 5,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005011515Member |  |  |
Market Value | 4,999,903 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005011515Member |  |  |
Cash Equivalents [Member] | US Treasury Securities [Member] | U S Treasury Bills 0.05%, 02/26/15 [Member] |  |  |  |
% of Partners' Capital | 16.90%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005022615Member |  |  |
Principal Amount | 7,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005022615Member |  |  |
Market Value | 6,999,510 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005022615Member |  |  |
Cash Equivalents [Member] | US Treasury Securities [Member] | U S Treasury Bills 0.05%, 04/23/15 [Member] |  |  |  |
% of Partners' Capital | 9.66%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005042315Member |  |  |
Principal Amount | 4,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005042315Member |  |  |
Market Value | 3,999,377 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills005042315Member |  |  |
Cash Equivalents [Member] | US Treasury Securities [Member] | U S Treasury Bills 0.07%, 05/21/15 [Member] |  |  |  |
% of Partners' Capital | 9.65%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills007052115Member |  |  |
Principal Amount | 4,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills007052115Member |  |  |
Market Value | 3,998,989 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills007052115Member |  |  |
Cash Equivalents [Member] | US Treasury Securities [Member] | U S Treasury Bills 0.10%, 06/25/15 [Member] |  |  |  |
% of Partners' Capital | 12.07%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills010062515Member |  |  |
Principal Amount | 5,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills010062515Member |  |  |
Market Value | 4,997,691 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills010062515Member |  |  |
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bill, 0.07%, 3/27/2014 [Member] |  |  |  |
% of Partners' Capital |  |  | 15.22%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills0073272014Member |
Principal Amount |  |  | 4,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills0073272014Member |
Market Value |  |  | 3,999,339 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_USTreasuryBills0073272014Member |
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] |  |  |  |
% of Partners' Capital |  |  | 30.47%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember |
Market Value |  |  | 8,010,771 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember |
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] |  |  |  |
% of Partners' Capital |  |  | 13.35%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_MorganStanleyInstitutionalLiquidityFundMember |
Principal Amount |  |  | 3,510,274 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_MorganStanleyInstitutionalLiquidityFundMember |
Market Value |  |  | 3,510,274 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_MorganStanleyInstitutionalLiquidityFundMember |
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member] |  |  |  |
% of Partners' Capital |  |  | 17.12%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember |
Principal Amount |  |  | 4,500,497 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember |
Market Value |  |  | 4,500,497 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember |
Cash Equivalents [Member] | United States [Member] | Treasury Obligations [Member] |  |  |  |
% of Partners' Capital | 60.35%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = bno_TreasuryObligationsMember |  |  |
Market Value | 24,995,470 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = bno_TreasuryObligationsMember |  |  |
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures CO February 2015 contracts, expiring January 2015 and February 2014 contracts, expiring January 2014 [Member] |  |  |  |
Number of Contracts | 722 us-gaap_InvestmentOwnedBalanceContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember |  | 237 us-gaap_InvestmentOwnedBalanceContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | [1]
Unrealized Gain Loss On Open Commodity Contracts | $ (6,347,090)bno_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | [2] | $ 28,670 bno_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | [1]
% of Partners' Capital | 15.32%bno_PercentageOfPartnersCapital / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | [2] | 0.11%bno_PercentageOfPartnersCapital / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember | [1]
[1] | Collateral amounted to $3,271,010 on open futures contracts.
[2] | Collateral amounted to $9,152,751 on open futures contracts.

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