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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
CONTRACTS AND AGREEMENTS |  |
Total commissions accrued to brokers | $ 1,689 | $ 2,187
Total commissions as annualized percentage of average total net assets | 0.04% | 0.04%

X
- 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

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