XML 40 R25.htm IDEA: XBRL DOCUMENT v3.19.1

CONTRACTS AND AGREEMENTS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Brokerage commissions	$ 26,284	$ 23,732
Percentage Of Average Daily Net Assets	0.12%	0.10%
Rebalancing Investments Transaction [Member]
Brokerage commissions	$ 25,667	$ 23,175
Percentage Of Average Daily Net Assets	97.65%	97.65%
Creation And Redemption Activity [Member]
Brokerage commissions	$ 617	$ 557
Percentage Of Average Daily Net Assets	2.35%	2.35%

X

- Definition

Percentage Of Average Daily Net Assets

+ References

No definition available.

+ Details

Name:	bno_PercentageOfAverageDailyNetAssets
Namespace Prefix:	bno_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=bno_RebalancingInvestmentsTransactionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=bno_TradesNecessitatedByCreationAndRedemptionActivityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: