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Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)		$ 93,336,439	$ 108,719,344	$ 14,434,325
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Change in unrealized (gain) loss on open commodity futures contracts		17,234,420	(33,279,859)	(19,374,784)
(Increase) decrease in dividends receivable		(1,691)	12,772	(12,055)
(Increase) decrease in interest receivable		4,171	(655)	(5,156)
(Increase) decrease in prepaid insurance	[1]	(7,848)	(20)	(9)
(Increase) decrease in prepaid registration fees		55,407	(55,407)	0
Increase (decrease) in payable due to Broker		(10,720,261)	21,925,587	0
Increase (decrease) in General Partner management fees payable		(34,438)	74,050	461
Increase (decrease) in professional fees payable		40,157	13,106	(7,904)
Increase (decrease) in brokerage commissions payable		0	9,180	0
Increase (decrease) in directors' fees payable	[1]	(380)	854	150
Increase (decrease) in license fees payable		(2,517)	6,494	(862)
Increase decrease in registration fees payable		96,068	0	0
Net cash provided by (used in) operating activities		99,999,527	97,425,446	(4,965,834)
Cash Flows from Financing Activities:
Addition of partnership shares		1,191,280	302,421,810	2,254,827
Redemption of partnership shares		(154,178,247)	(268,903,063)	(12,410,743)
Net cash provided by (used in) financing activities		(152,986,967)	33,518,747	(10,155,916)
Net Increase (Decrease) in Cash and Cash Equivalents		(52,987,440)	130,944,193	(15,121,750)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		182,551,168	51,606,975	66,728,725
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		$ 129,563,728	$ 182,551,168	$ 51,606,975
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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Period Type:	duration

X

- Definition

Increase (Decrease) In Professional Fees Payable

+ References

No definition available.

+ Details

Name:	usl_IncreaseDecreaseInProfessionalFeesPayable
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in registration fees payable.

+ References

No definition available.

+ Details

Name:	usl_IncreaseDecreaseInRegistrationFeesPayable
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Increase (Decrease) Management Fees Payable

+ References

No definition available.

+ Details

Name:	usl_IncreaseDecreaseManagementFeesPayable
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Payments To Partnership Redemption

+ References

No definition available.

+ Details

Name:	usl_PaymentsToPartnershipRedemption
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration