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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
CONTRACTS AND AGREEMENTS |  |  |  |
Total commissions accrued to brokers | $ 1,193 | $ 2,000 | $ 4,125 | $ 7,223
Total commissions as annualized percentage of average total net assets | 0.03% | 0.03% | 0.03% | 0.03%

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- Definition The percentage of average daily net assets. + References No definition available. + Details
Name: | unl_PercentageOfAverageDailyNetAssets
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ContractorsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration