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Condensed Schedule of Investments (USD $) | Mar. 31, 2015
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Market Values | $ 60,987,238 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
% of Partners' Capital | 56.20%bno_PercentageOfPartnersCapital
Cash Equivalents [Member] | US Treasury Securities [Member] |
Market Values | 50,987,238 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
% of Partners' Capital | 46.98%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.05%, 4/23/2015 [Member] |
Principal Amount | 4,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0054232015Member
Market Values | 3,999,878 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0054232015Member
% of Partners' Capital | 3.69%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0054232015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.07, 5/21/2015 [Member] |
Principal Amount | 4,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0075212015Member
Market Values | 3,999,639 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0075212015Member
% of Partners' Capital | 3.69%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0075212015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.10, 6/25/2015 [Member] |
Principal Amount | 5,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0106252015Member
Market Values | 4,998,878 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0106252015Member
% of Partners' Capital | 4.61%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0106252015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.05, 7/09/2015 [Member] |
Principal Amount | 3,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0057092015Member
Market Values | 2,999,629 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0057092015Member
% of Partners' Capital | 2.76%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0057092015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.08, 7/23/2015 [Member] |
Principal Amount | 5,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0087232015Member
Market Values | 4,998,823 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0087232015Member
% of Partners' Capital | 4.61%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0087232015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.06, 7/30/2015 [Member] |
Principal Amount | 3,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0067302015Member
Market Values | 2,999,450 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0067302015Member
% of Partners' Capital | 2.76%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0067302015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.06, 8/06/2015 [Member] |
Principal Amount | 2,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0068062015Member
Market Values | 1,999,612 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0068062015Member
% of Partners' Capital | 1.84%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0068062015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.07, 8/13/2015 [Member] |
Principal Amount | 3,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078132015Member
Market Values | 2,999,274 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078132015Member
% of Partners' Capital | 2.76%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078132015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.07, 8/20/2015 [Member] |
Principal Amount | 4,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078202015Member
Market Values | 3,998,982 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078202015Member
% of Partners' Capital | 3.68%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078202015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.07, 8/27/2015 [Member] |
Principal Amount | 5,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078272015Member
Market Values | 4,998,664 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078272015Member
% of Partners' Capital | 4.61%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0078272015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.08, 9/03/2015 [Member] |
Principal Amount | 5,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0089032015Member
Market Values | 4,998,385 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0089032015Member
% of Partners' Capital | 4.61%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0089032015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.10, 9/10/2015 [Member] |
Principal Amount | 3,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0109102015Member
Market Values | 2,998,717 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0109102015Member
% of Partners' Capital | 2.76%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0109102015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.12, 9/17/2015 [Member] |
Principal Amount | 2,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0129172015Member
Market Values | 1,998,920 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0129172015Member
% of Partners' Capital | 1.84%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0129172015Member
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.11, 9/24/2015 [Member] |
Principal Amount | 3,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0119242015Member
Market Values | 2,998,387 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0119242015Member
% of Partners' Capital | 2.76%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = bno_UsTreasuryBills0119242015Member
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] |
Principal Amount | 10,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_MorganStanleyInstitutionalLiquidityFundMember
Market Values | 10,000,000 us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_MorganStanleyInstitutionalLiquidityFundMember
% of Partners' Capital | 9.22%bno_PercentageOfPartnersCapital / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_MoneyMarketFundsMember / invest_InvestmentSecuritiesSeriesAxis = bno_MorganStanleyInstitutionalLiquidityFundMember
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures C0 May 2015 contracts, expiring April 15, 2015 [Member] |
Number of Contracts | 1,969 us-gaap_InvestmentOwnedBalanceContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember
Unrealized Loss on Open Commodity Contracts | $ (10,535,860)bno_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember
% of Partners' Capital | (9.71%)bno_PercentageOfPartnersCapital / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesSeriesAxis = bno_IceBrentCrudeOilFuturesCoOneMember / us-gaap_InvestmentTypeAxis = bno_OpenFuturesContractsLongMember

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