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Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities:
Net income (loss)		$ 5,056,744	$ (56,520)	$ 38,362,556
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		(1,584,034)	(1,070,901)	22,781,720
(Increase) decrease in dividends receivable		27,493	(13,197)	(87,367)
(Increase) decrease in interest receivable		75,353	(6,662)	(177,644)
(Increase) decrease in prepaid other		551	3,166	(3,717)
(Increase) decrease in prepaid insurance	[1]	160	5,837	1,232
(Increase) decrease in ETF transaction fees receivable		0	350	(350)
Increase (decrease) in payable due to Broker		0	0	(11,205,326)
Increase (decrease) in General Partner management fees payable		(9,494)	(10,037)	(21,997)
Increase (decrease) in professional fees payable		(5,117)	(133,048)	136,302
Increase (decrease) in directors' fees payable	[1]	(110)	(383)	(545)
Increase (decrease) in license fees payable		8,520	0	(4,329)
Increase decrease in registration fees payable		0	0	(96,068)
Net cash provided by (used in) operating activities		3,570,066	(1,281,395)	49,684,467
Cash Flows from Financing Activities:
Addition of partnership shares		0	20,894,253	10,959,517
Redemption of partnership shares		(22,577,341)	(40,754,434)	(100,133,193)
Net cash provided by (used in) financing activities		(22,577,341)	(19,860,181)	(89,173,676)
Net Increase (Decrease) in Cash and Cash Equivalents		(19,007,275)	(21,141,576)	(39,489,209)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		68,932,943	90,074,519	129,563,728
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		$ 49,925,668	$ 68,932,943	$ 90,074,519
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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

X

- Definition

Increase (Decrease) in License Fees Payable

+ References

No definition available.

+ Details

Name:	usl_IncreaseDecreaseInLicenseFeesPayable
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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