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Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income (loss)		$ 38,362,556	$ 93,336,439	$ 108,719,344
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		22,781,720	17,234,420	(33,279,859)
(Increase) decrease in dividends receivable		(87,367)	(1,691)	12,772
(Increase) decrease in interest receivable		(177,644)	4,171	(655)
(Increase) decrease in prepaid insurance	[1]	1,232	(7,848)	(20)
(Increase) decrease in prepaid registration fees		0	55,407	(55,407)
(Increase) decrease in ETF transaction fees receivable		(350)	0	0
Increase (decrease) in payable due to Broker		(11,205,326)	(10,720,261)	21,925,587
Increase (decrease) in General Partner management fees payable		(21,997)	(34,438)	74,050
Increase (decrease) in professional fees payable		136,302	40,157	13,106
Increase (decrease) in brokerage commissions payable		0	0	9,180
Increase (decrease) in directors' fees payable	[1]	(545)	(380)	854
(Increase) decrease in prepaid license fees		(3,717)	0	0
Increase (decrease) in license fees payable		(4,329)	(2,517)	6,494
Increase (decrease) in registration fees payable		(96,068)	96,068	0
Net cash provided by (used in) operating activities		49,684,467	99,999,527	97,425,446
Cash Flows from Financing Activities:
Addition of partnership shares		10,959,517	1,191,280	302,421,810
Redemption of partnership shares		(100,133,193)	(154,178,247)	(268,903,063)
Net cash provided by (used in) financing activities		(89,173,676)	(152,986,967)	33,518,747
Net Increase (Decrease) in Cash and Cash Equivalents		(39,489,209)	(52,987,440)	130,944,193
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		129,563,728	182,551,168	51,606,975
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		$ 90,074,519	$ 129,563,728	$ 182,551,168
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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Increase (Decrease) in License Fees Payable

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No definition available.

+ Details

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

X

- Definition

The increase (decrease) during the reporting period in the amount due from License fee paid in advance.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) of consideration paid in advance for registration fees.

+ References

No definition available.

+ Details

Name:	usl_IncreaseDecreaseInPrepaidRegistrationFees
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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