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Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income (loss)	$ (26,451,869)us-gaap_NetIncomeLoss	$ 2,260,564us-gaap_NetIncomeLoss	$ 4,409,324us-gaap_NetIncomeLoss
Adjustments to reconcile net income (income) to net cash provided by (used in) operating activities:
(Increase) decrease in commodity futures trading account - cash and cash equivalents	(5,881,741)us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	1,663,093us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	3,366,714us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities
Unrealized (gain) loss on futures contracts	6,375,760us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts	710,660us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts	(1,655,900)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
(Increase) decrease in receivable from General Partner	(13,711)us-gaap_IncreaseDecreaseDueFromOfficersAndStockholders	(33,405)us-gaap_IncreaseDecreaseDueFromOfficersAndStockholders	57,183us-gaap_IncreaseDecreaseDueFromOfficersAndStockholders
(Increase) decrease in dividends receivable	558us-gaap_IncreaseDecreaseInDividendsReceivable	452us-gaap_IncreaseDecreaseInDividendsReceivable	(696)us-gaap_IncreaseDecreaseInDividendsReceivable
(Increase) decrease in interest receivable	0bno_IncreaseDecreaseInAcquiredInterestReceivable	0bno_IncreaseDecreaseInAcquiredInterestReceivable	11bno_IncreaseDecreaseInAcquiredInterestReceivable
(Increase) decrease in ETF transaction fees receivable	(350)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables	(350)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables	0us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Increase (decrease) in General Partner management fees payable	4,068bno_IncreaseDecreaseManagementFeesPayable	(10,163)bno_IncreaseDecreaseManagementFeesPayable	(5,637)bno_IncreaseDecreaseManagementFeesPayable
Increase (decrease) in professional fees payable	(24,606)bno_IncreaseDecreaseInProfessionalFeesPayable	15,103bno_IncreaseDecreaseInProfessionalFeesPayable	(21,183)bno_IncreaseDecreaseInProfessionalFeesPayable
Increase (decrease) in brokerage commissions payable	865us-gaap_IncreaseDecreaseInPayablesToBrokerDealers	(400)us-gaap_IncreaseDecreaseInPayablesToBrokerDealers	305us-gaap_IncreaseDecreaseInPayablesToBrokerDealers
Increase (decrease) in directors' fees and insurance payable	129us-gaap_IncreaseDecreaseInDueToOfficersAndStockholders	(73)us-gaap_IncreaseDecreaseInDueToOfficersAndStockholders	(717)us-gaap_IncreaseDecreaseInDueToOfficersAndStockholders
Net cash provided by (used in) operating activities	(25,990,897)us-gaap_NetCashProvidedByUsedInOperatingActivities	4,605,481us-gaap_NetCashProvidedByUsedInOperatingActivities	6,149,404us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Financing Activities:
Addition of partnership shares	75,499,118us-gaap_ProceedsFromPartnershipContribution	118,483,039us-gaap_ProceedsFromPartnershipContribution	89,087,948us-gaap_ProceedsFromPartnershipContribution
Redemption of partnership shares	(38,357,031)bno_PaymentsToPartnershipRedemption	(137,337,227)bno_PaymentsToPartnershipRedemption	(85,693,039)bno_PaymentsToPartnershipRedemption
Net cash provided by (used in) financing activities	37,142,087us-gaap_NetCashProvidedByUsedInFinancingActivities	(18,854,188)us-gaap_NetCashProvidedByUsedInFinancingActivities	3,394,909us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash and Cash Equivalents	11,151,190us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(14,248,707)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	9,544,313us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, beginning of year	25,257,312us-gaap_CashAndCashEquivalentsAtCarryingValue	39,506,019us-gaap_CashAndCashEquivalentsAtCarryingValue	29,961,706us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, end of year	$ 36,408,502us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 25,257,312us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 39,506,019us-gaap_CashAndCashEquivalentsAtCarryingValue

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