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SUBSEQUENT EVENTS - (Details) - contract		1 Months Ended
	Apr. 23, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020
Subsequent Event
SUBSEQUENT EVENTS
Number of futures contracts	10,000	35,000	50,000	78,000	15,000

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

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- Definition

Number of long term futures contract in relation to Crude oil.

+ References

No definition available.

+ Details

Name:	usl_NumberOfLongTermFuturesContracts
Namespace Prefix:	usl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: