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CONTRACTS AND AGREEMENTS (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015
Annual Fee Payable For Transfer Agency Services	$ 20,000bno_AnnualFeePayableForTransferAgencyServices
Maximum [Member]
Transaction fees per transaction	15bno_TransactionFeesPaid / us-gaap_RangeAxis = us-gaap_MaximumMember
Commission Per Round Turn	15bno_CommissionPerRoundTurn / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member]
Annual Fee Payable For Transfer Agency Services	75,000bno_AnnualFeePayableForTransferAgencyServices / us-gaap_RangeAxis = us-gaap_MinimumMember
Transaction fees per transaction	7bno_TransactionFeesPaid / us-gaap_RangeAxis = us-gaap_MinimumMember
Commission Per Round Turn	7bno_CommissionPerRoundTurn / 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	500,000,000bno_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	1,000,000,000bno_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	500,000,000bno_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	1,000,000,000bno_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	3,000,000,000bno_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	$ 3,000,000,000bno_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = bno_GroupFiveMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TypeOfArrangementAxis = bno_MarketingAgreementMember

X

- 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

X

- 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

X

- 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

Represents the commissions round turn trade including exchange fees.

+ References

No definition available.

+ Details

Name:	bno_CommissionPerRoundTurn
Namespace Prefix:	bno_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Transaction Fees Paid.

+ References

No definition available.

+ Details

Name:	bno_TransactionFeesPaid
Namespace Prefix:	bno_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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