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FINANCIAL HIGHLIGHTS (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jun. 02, 2010
Per Share Operating Performance: |  |  |  |  |
Net asset value, beginning of period | $ 22.39 bno_NetAssetValuePerUnit |  | $ 43.81 bno_NetAssetValuePerUnit |  | $ 50.00 bno_NetAssetValuePerUnit
Total income (loss) | $ (1.86)bno_TotalIncomePerUnit |  | $ (0.65)bno_TotalIncomePerUnit |  |
Net expenses | $ (0.05)bno_TotalExpensePerUnit |  | $ (0.10)bno_TotalExpensePerUnit |  |
Net increase (decrease) in net asset value | $ (1.91)bno_NetIncreaseDecreaseInNetAssetValue |  | $ (0.75)bno_NetIncreaseDecreaseInNetAssetValue |  |
Net asset value, end of period | $ 20.48 bno_NetAssetValuePerUnit |  | $ 43.06 bno_NetAssetValuePerUnit |  | $ 50.00 bno_NetAssetValuePerUnit
Total Return | (8.53%)bno_PercentageOfTotalReturn |  | (1.71%)bno_PercentageOfTotalReturn |  |
Ratios to Average Net Assets |  |  |  |  |
Total income (loss) | (2.95%)bno_PercentageOfTotalIncomeOnNetAssets |  | (1.37%)bno_PercentageOfTotalIncomeOnNetAssets |  |
Management fees | 0.75%bno_PercentageOfManagementFeesOnNetAssets | [1] | 0.75%bno_PercentageOfManagementFeesOnNetAssets | [1] |
Total expenses excluding management fees | 0.29%bno_PercentageOfTotalExpensesExcludingManagementFeesOnNetAssets | [1] | 0.70%bno_PercentageOfTotalExpensesExcludingManagementFeesOnNetAssets | [1] |
Expenses waived | (0.13%)bno_PercentageOfExpensesWaivedOnNetAssets | [1] | (0.46%)bno_PercentageOfExpensesWaivedOnNetAssets | [1] |
Net expenses excluding management fees | 0.16%bno_PercentageOfNetExpensesExcludingManagementFeeOnNetAssets | [1] | 0.24%bno_PercentageOfNetExpensesExcludingManagementFeeOnNetAssets | [1] |
Net income (loss) | (3.17%)bno_PercentageOfNetIncomeOnNetAssets |  | (1.62%)bno_PercentageOfNetIncomeOnNetAssets |  |
[1] | Annualized

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