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CONTRACTS AND AGREEMENTS (Details Textual) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Annual Fee Payable For Transfer Agency Services | $ 20,000 |
Percentage Of Average Daily Assets Net Total | 0.07% | 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% |
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] | Maximum [Member] |  |
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% |
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] | Minimum [Member] |  |
Base amount for determining fee percentage | $ 3,000,000,000 |

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

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

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- Definition Transaction Fees Paid. + References No definition available. + Details
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Namespace Prefix: | bno_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration