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Condensed Statements of Cash Flows (Unaudited) - USD ($)		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities:
Net income (loss)		$ 29,742,222	$ 89,123,905
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		29,061,300	3,118,050
(Increase) decrease in dividends receivable		(78,602)	(1,868)
(Increase) decrease in interest receivable		(93,788)	4,096
(Increase) decrease in prepaid license fees		(3,152)	0
(Increase) decrease in prepaid insurance	[1]	(7,960)	(18,422)
(Increase) decrease in prepaid registration fees		0	55,407
Increase (decrease) in payable due to Broker		(11,205,326)	1,187,947
Increase (decrease) in General Partner management fees payable		(15,447)	(29,530)
Increase (decrease) in professional fees payable		137,723	13,505
Increase (decrease) in directors' fees payable	[1]	(355)	(94)
Increase (decrease) in license fees payable		(4,329)	(1,864)
Increase (decrease) in registration fees payable		(96,068)	57,888
Net cash provided by (used in) operating activities		47,436,218	93,509,020
Cash Flows from Financing Activities:
Addition of partnership shares		7,750,923	1,191,280
Redemption of partnership shares		(77,810,602)	(139,920,449)
Net cash provided by (used in) financing activities		(70,059,679)	(138,729,169)
Net Increase (Decrease) in Cash and Cash Equivalents		(22,623,461)	(45,220,149)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period		129,563,728	182,551,168
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period		$ 106,940,267	$ 137,331,019
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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X

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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