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Financial Highlights (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 02, 2010
Per Share Operating Performance: |  |  |  |  |  |
Net asset value, beginning of year | $ 43.81 bno_NetAssetValuePerUnit | $ 40.98 bno_NetAssetValuePerUnit | [1] | $ 37.27 bno_NetAssetValuePerUnit | [1] | $ 50.00 bno_NetAssetValuePerUnit
Total income (loss) | $ (21.06)bno_TotalIncomePerUnit | $ 3.24 bno_TotalIncomePerUnit |  | $ 4.10 bno_TotalIncomePerUnit | [1] |
Net expenses | $ (0.36)bno_TotalExpensePerUnit | $ (0.41)bno_TotalExpensePerUnit |  | $ (0.39)bno_TotalExpensePerUnit | [1] |
Net increase (decrease) in Net Asset Value | $ (21.42)bno_NetIncreaseDecreaseInNetAssetValue | $ 2.83 bno_NetIncreaseDecreaseInNetAssetValue |  | $ 3.71 bno_NetIncreaseDecreaseInNetAssetValue | [1] |
Net asset value, end of year | $ 22.39 bno_NetAssetValuePerUnit | $ 43.81 bno_NetAssetValuePerUnit |  | $ 40.98 bno_NetAssetValuePerUnit | [1] | $ 50.00 bno_NetAssetValuePerUnit
Total Return | (48.89%)bno_PercentageOfTotalReturn | 6.91%bno_PercentageOfTotalReturn |  | 9.95%bno_PercentageOfTotalReturn |  |
Ratios to Average Net Assets |  |  |  |  |  |
Total income (loss) | (68.25%)bno_PercentageOfTotalIncomeOnNetAssets | 6.66%bno_PercentageOfTotalIncomeOnNetAssets |  | 9.44%bno_PercentageOfTotalIncomeOnNetAssets |  |
Management fees | 0.75%bno_PercentageOfManagementFeesOnNetAssets | 0.75%bno_PercentageOfManagementFeesOnNetAssets |  | 0.75%bno_PercentageOfManagementFeesOnNetAssets |  |
Total expenses excluding management fees | 0.56%bno_PercentageOfTotalExpensesExcludingManagementFeesOnNetAssets | 0.45%bno_PercentageOfTotalExpensesExcludingManagementFeesOnNetAssets |  | 0.32%bno_PercentageOfTotalExpensesExcludingManagementFeesOnNetAssets |  |
Expenses waived | (0.39%)bno_PercentageOfExpensesWaivedOnNetAssets | (0.20%)bno_PercentageOfExpensesWaivedOnNetAssets |  | (0.09%)bno_PercentageOfExpensesWaivedOnNetAssets |  |
Net expenses excluding management fees | 0.17%bno_PercentageOfNetExpensesExcludingManagementFeeOnNetAssets | 0.25%bno_PercentageOfNetExpensesExcludingManagementFeeOnNetAssets |  | 0.23%bno_PercentageOfNetExpensesExcludingManagementFeeOnNetAssets |  |
Net income (loss) | (69.17%)bno_PercentageOfNetIncomeOnNetAssets | 5.66%bno_PercentageOfNetIncomeOnNetAssets |  | 8.46%bno_PercentageOfNetIncomeOnNetAssets |  |
[1] | On August 26, 2013, BNO executed a 2-for-1 forward share split for all shareholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward share split was payable after the close of markets on August 28, 2013. BNO began trading at its post split price on August 29, 2013. The Financial Highlights have been adjusted for the periods shown to reflect the 2-for-1 forward share split on a retroactive basis.

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