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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2025
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Percentage of management fee in average daily total net assets	0.60%
Registration fees	$ 0	$ 0
Estimated directors' fees and expenses	$ 3,763	4,392	$ 18,000
Fee percentage	0.015%
Licensing fee incurred	$ 1,778	$ 2,458
Investor tax reporting cost			150,000
USL and the Related Public Funds
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated directors' fees and expenses			$ 883,000

X

- Definition

Amount of registration fee expense for issuance of shares or units.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (m)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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X

- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of base fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	usl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	usl_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

It represent the value of license fees and other offering expenses.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of Management Fee In Average Daily Total Net Assets.

+ References

No definition available.

+ Details

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