XML 26 R26.htm IDEA: XBRL DOCUMENT v2.4.0.8

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Short-Term Investments	$ 28,215,266	$ 40,715,676
Exchange-Traded Futures Contracts
Foreign Contracts	192,090	739,330
Fair Value, Inputs, Level 1 [Member]
Short-Term Investments	28,215,266	40,715,676
Exchange-Traded Futures Contracts
Foreign Contracts	192,090	739,330
Fair Value, Inputs, Level 2 [Member]
Short-Term Investments	0	0
Exchange-Traded Futures Contracts
Foreign Contracts	0	0
Fair Value, Inputs, Level 3 [Member]
Short-Term Investments	0	0
Exchange-Traded Futures Contracts
Foreign Contracts	$ 0	$ 0

X

- Details

Name:	bno_ExchangeTradedFuturesContractsAbstract
Namespace Prefix:	bno_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unrealized gain (loss) on open commodity futures contracts.

+ References

No definition available.

+ Details

Name:	bno_UnrealizedGainLossOnOpenCommodityFuturesContracts
Namespace Prefix:	bno_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

+ Details

Name:	us-gaap_ShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant