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Contracts And Agreements (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014
Annual Fee Payable For Transfer Agency Services | $ 20,000 bno_AnnualFeePayableForTransferAgencyServices
Maximum [Member] |
Transaction fees per transaction | 15 bno_TransactionFeesPerTransaction / us-gaap_RangeAxis = us-gaap_MaximumMember
Commission Per Round Turn Trade | 15 bno_CommissionsPerRoundturnTrade / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member] |
Annual Fee Payable For Transfer Agency Services | 75,000 bno_AnnualFeePayableForTransferAgencyServices / us-gaap_RangeAxis = us-gaap_MinimumMember
Transaction fees per transaction | 7 bno_TransactionFeesPerTransaction / us-gaap_RangeAxis = us-gaap_MinimumMember
Commission Per Round Turn Trade | 7 bno_CommissionsPerRoundturnTrade / us-gaap_RangeAxis = us-gaap_MinimumMember
First $500 Million Of The Related Public Funds', Combined Net Assets [Member] |
Fee percentage | 0.06%bno_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupSixMember
First $500 Million Of The Related Public Funds', Combined Net Assets [Member] | Maximum [Member] |
Base amount for determining fee percentage | 500,000,000 bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupSixMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Related Public Funds' Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member] |
Fee percentage | 0.0465%bno_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupSevenMember
Related Public Funds' Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member] | Maximum [Member] |
Base amount for determining fee percentage | 1,000,000,000 bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupSevenMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Related Public Funds' Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member] | Minimum [Member] |
Base amount for determining fee percentage | 500,000,000 bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupSevenMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Related Public Funds' Combined Net Assets Exceed $1 Billion [Member] |
Fee percentage | 0.035%bno_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupEightMember
Related Public Funds' Combined Net Assets Exceed $1 Billion [Member] | Minimum [Member] |
Base amount for determining fee percentage | 1,000,000,000 bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupEightMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] |
Fee percentage | 0.06%bno_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupFourMember / us-gaap_TypeOfArrangementAxis = bno_MarketingAgreementMember
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] | Maximum [Member] |
Base amount for determining fee percentage | 3,000,000,000 bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupFourMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TypeOfArrangementAxis = bno_MarketingAgreementMember
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] |
Fee percentage | 0.04%bno_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupFiveMember / us-gaap_TypeOfArrangementAxis = bno_MarketingAgreementMember
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] | Minimum [Member] |
Base amount for determining fee percentage | $ 3,000,000,000 bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupFiveMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TypeOfArrangementAxis = bno_MarketingAgreementMember

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- Definition The annual fee payable for transfer agency services reported during the period. + References No definition available. + Details
Name: | bno_AnnualFeePayableForTransferAgencyServices
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Base Fee Percentage + References No definition available. + Details
Name: | bno_BaseFeePercentage
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Basis Amount for Fee Percentage + References No definition available. + Details
Name: | bno_BasisAmountForFeePercentage
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition It represents the amount of commissions per round-turn trade during the period. + References No definition available. + Details
Name: | bno_CommissionsPerRoundturnTrade
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition It represents the amount of transaction fees per transaction during the period. + References No definition available. + Details
Name: | bno_TransactionFeesPerTransaction
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | invest_InvestmentIdentifierSchemeAxis=bno_GroupEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentIdentifierSchemeAxis=bno_GroupSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentIdentifierSchemeAxis=bno_GroupSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=bno_MarketingAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |