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Contracts And Agreements (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Minimum Amount Of Custody Fund Accounting And Fund Administration Services Payable | $ 75,000 |  |
Annual Fee Payable For Transfer Agency Services | 20,000 |  |
Brokerage commissions | 29,674 | 33,506 | 31,871
Rebalancing Cost | 24,097 | 29,561 | 22,560
Percentage Of Rebalancing Cost | 81.21% | 88.23% | 70.79%
Creation and Redemption Activity Costs | 5,577 | 2,945 | 9,311
Percentage of Creation And Redemption Activity Costs | 18.79% | 8.79% | 29.21%
Percentage Of Average Daily Assets Net Total | 0.07% | 0.06% | 0.08%
Maximum [Member] |  |  |
Transaction fees per transaction | 15 |  |
Commission Per Round Turn | 15 |  |
Minimum [Member] |  |  |
Annual Fee Payable For Transfer Agency Services | 75,000 |  |
Transaction fees per transaction | 7 |  |
Commission Per Round Turn | 7 |  |
First $500 Million Of The Related Public Funds’, Combined Net Assets [Member] |  |  |
Fee percentage | 0.06% |  |
First $500 Million Of The Related Public Funds’, Combined Net Assets [Member] | Maximum [Member] |  |  |
Base amount for determining fee percentage | 500,000,000 |  |
Related Public Funds’ Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member] |  |  |
Fee percentage | 0.0465% |  |
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 |  |
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 |  |
Related Public Funds’ Combined Net Assets Exceed $1 Billion [Member] |  |  |
Fee percentage | 0.035% |  |
Related Public Funds’ Combined Net Assets Exceed $1 Billion [Member] | Minimum [Member] |  |  |
Base amount for determining fee percentage | 1,000,000,000 |  |
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] |  |  |
Fee percentage | 0.06% |  |
Base amount for determining fee percentage | 3,000,000,000 |  |
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] |  |  |
Fee percentage | 0.04% |  |
Base amount for determining fee percentage | $ 3,000,000,000 |  |

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 The amount of commission accrued as a result of trades necessitated by creation and redemption activity. + References No definition available. + Details
Name: | bno_CreationAndRedemptionActivityCosts
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The minimum amount of custody, fund accounting and fund administration services payable reported during the period. + References No definition available. + Details
Name: | bno_MinimumAmountOfCustodyFundAccountingAndFundAdministrationServicesPayable
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of average daily total net assets during the period. + References No definition available. + Details
Name: | bno_PercentageOfAverageDailyAssetsNetTotal
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of creation and redemption activity costs during the reporting period. + References No definition available. + Details
Name: | bno_PercentageOfCreationAndRedemptionActivityCosts
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of rebalancing cost during the reporting period. + References No definition available. + Details
Name: | bno_PercentageOfRebalancingCost
Namespace Prefix: | bno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount attributable to commission accrued as a result of rebalancing costs during the reporting period. + References No definition available. + Details
Name: | bno_RebalancingCost
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
- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
Name: | us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration