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Schedule of Investments (USD $)

Dec. 31, 2014

Dec. 31, 2013

% of Partners' Capital

60.35%bno_PercentageOfPartnersCapital

45.69%bno_PercentageOfPartnersCapital

Market Value

$ 24,995,470us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue

$ 12,010,110us-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

5,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills005011515Member

Market Value

4,999,903us-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
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/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills005022615Member

Principal Amount

7,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills005022615Member

Market Value

6,999,510us-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

4,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills005042315Member

Market Value

3,999,377us-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

4,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills007052115Member

Market Value

3,998,989us-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

5,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills010062515Member

Market Value

4,997,691us-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

4,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_USTreasuryBills0073272014Member

Market Value

3,999,339us-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

8,010,771us-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

3,510,274us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_MorganStanleyInstitutionalLiquidityFundMember

Market Value

3,510,274us-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

4,500,497us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= bno_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember

Market Value

4,500,497us-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

24,995,470us-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

722us-gaap_InvestmentOwnedBalanceContracts
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/ invest_InvestmentSecuritiesSeriesAxis
= bno_IceBrentCrudeOilFuturesCoOneMember
/ us-gaap_InvestmentTypeAxis
= bno_OpenFuturesContractsLongMember

237us-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]

$ 28,670bno_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= bno_IceBrentCrudeOilFuturesCoOneMember
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= 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
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^[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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Balance held at close of period in number of contracts.

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