XML 19 R4.htm IDEA: XBRL DOCUMENT v3.20.2

Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2020 USD ($)
Condensed Schedule of Investments (Unaudited)
Expiration date	September 30, 2020
Collateral Amount On Open Futures Contracts	$ 37,172,030

X

- Definition

The list of dates or date range within which the options may be exercised of the investment subject to option.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Footnote 8(d)))
-URI http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.4(b))
-URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611322-123010

+ Details

Name:	us-gaap_InvestmentOwnedSubjectToOptionExerciseDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The collateral amount on open future contracts.

+ References

No definition available.

+ Details

Name:	usl_CollateralAmountOnOpenFuturesContracts
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Statement - Schedule of Investments [Abstract]

+ References

No definition available.

+ Details

Name:	usl_StatementScheduleOfInvestmentsAbstract
Namespace Prefix:	usl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration