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Condensed Statements of Cash Flows (Unaudited) - USD ($)		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
Cash Flows from Operating Activities:
Net income (loss)		$ 51,435,870	$ 82,013,291
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		(3,245,310)	(15,076,340)
(Increase) decrease in dividends receivable		(55,899)	(2,932)
(Increase) decrease in interest receivable		339	6,600
(Increase) decrease in prepaid license fees		(2,104)	0
(Increase) decrease in prepaid insurance	[1]	(17,151)	(28,995)
(Increase) decrease in prepaid registration fees		0	55,407
Increase (decrease) in payable due to Broker		(4,531,874)	15,833,693
Increase (decrease) in General Partner management fees payable		4,337	(8,147)
Increase (decrease) in professional fees payable		(64,145)	(262)
Increase (decrease) in directors' fees payable	[1]	(356)	255
Increase (decrease) in license fees payable		(4,329)	(565)
Increase (decrease) in registration fees payable		75,115	19,708
Net cash provided by (used in) operating activities		43,594,493	82,811,713
Cash Flows from Financing Activities:
Addition of partnership shares		2,178,358	0
Redemption of partnership shares		(55,065,213)	(91,124,330)
Net cash provided by (used in) financing activities		(52,886,855)	(91,124,330)
Net Increase (Decrease) in Cash and Cash Equivalents		(9,292,362)	(8,312,617)
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		$ 120,271,366	$ 174,238,551
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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+ 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