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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
CONTRACTS AND AGREEMENTS |  |
Total commissions accrued to brokers | $ 2,061 | $ 2,596
Total commissions as annualized percentage of average total net assets | 0.01% | 0.01%

X
- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | usl_ContractsAndAgreementsLineItem
Namespace Prefix: | usl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of average daily net assets. + References No definition available. + Details
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Namespace Prefix: | usl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant