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Condensed Statements of Cash Flows - USD ($)		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Cash Flows from Operating Activities:
Net income (loss)		$ (3,688,777)	$ 42,318,563
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		2,231,840	(14,680,420)
(Increase) decrease in dividends receivable		29,375	(9,444)
(Increase) decrease in interest receivable		(20,483)	260
(Increase) decrease in prepaid other		(794)	0
(Increase) decrease in prepaid insurance	[1]	(14,928)	(26,243)
(Increase) decrease in ETF transaction fees receivable		350	0
Increase (decrease) in payable due to Broker		0	15,659,374
Increase (decrease) in General Partner management fees payable		(6,867)	12,424
Increase (decrease) in professional fees payable		(95,375)	(41,457)
Increase (decrease) in directors' fees payable	[1]	(329)	(53)
Increase (decrease) in license fees payable		0	125
Increase (decrease) in registration fees payable		0	37,350
Net cash provided by (used in) operating activities		(1,565,988)	43,270,479
Cash Flows from Financing Activities:
Addition of partnership shares		11,820,219	0
Redemption of partnership shares		(12,242,667)	(37,552,715)
Net cash provided by (used in) financing activities		(422,448)	(37,552,715)
Net Increase (Decrease) in Cash and Cash Equivalents		(1,988,436)	5,717,764
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period		90,074,519	129,563,728
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period		$ 88,086,083	$ 135,281,492
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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+ 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