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Condensed Statements of Cash Flows - USD ($)		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities:
Net income (loss)		$ 89,123,905	$ 82,719,235
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		3,118,050	(33,569,439)
(Increase) decrease in dividends receivable		(1,868)	10,621
(Increase) decrease in interest receivable		4,096	2,968
(Increase) decrease in prepaid insurance	[1]	(18,422)	(1,512)
(Increase) decrease in prepaid registration fees		55,407	(93,587)
Increase (decrease) in payable due to Broker		1,187,947	10,212,377
Increase (decrease) in General Partner management fees payable		(29,530)	79,238
Increase (decrease) in professional fees payable		13,505	3,238
Increase (decrease) in brokerage commissions payable		0	9,180
Increase (decrease) in directors' fees payable	[1]	(94)	1,287
Increase (decrease) in license fees payable		(1,864)	8,102
Increase (decrease) in registration fees payable		57,888	0
Net cash provided by (used in) operating activities		93,509,020	59,381,708
Cash Flows from Financing Activities:
Addition of partnership shares		1,191,280	302,421,446
Redemption of partnership shares		(139,920,449)	(226,358,016)
Net cash provided by (used in) financing activities		(138,729,169)	76,063,430
Net Increase (Decrease) in Cash and Cash Equivalents		(45,220,149)	135,445,138
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period		182,551,168	51,606,975
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period		$ 137,331,019	$ 187,052,113
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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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