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Condensed Statements of Cash Flows - USD ($)		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities:
Net income (loss)		$ 42,318,563	$ 41,440,395
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		(14,680,420)	(8,340,980)
(Increase) decrease in dividends receivable		(9,444)	(3,466)
(Increase) decrease in interest receivable		260	6,665
(Increase) decrease in prepaid insurance		(26,243)	(39,454)
(Increase) decrease in prepaid registration fees		0	37,350
Increase (decrease) in payable due to Broker		15,659,374	10,714,829
Increase (decrease) in General Partner management fees payable		12,424	8,217
Increase (decrease) in professional fees payable		(41,457)	(44,086)
Increase (decrease) in directors' fees payable	[1]	(53)	148
Increase (decrease) in license fees payable		125	(185)
Increase (decrease) in registration fees payable		37,350	0
Net cash provided by (used in) operating activities		43,270,479	43,779,433
Cash Flows from Financing Activities:
Addition of partnership shares		0	0
Redemption of partnership shares		(37,552,715)	(40,340,230)
Net cash provided by (used in) financing activities		(37,552,715)	(40,340,230)
Net Increase (Decrease) in Cash and Cash Equivalents		5,717,764	3,439,203
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		$ 135,281,492	$ 185,990,371
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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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