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CONTRACTS AND AGREEMENTS - Brokerage Commission (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
CONTRACTS AND AGREEMENTS |  |
Total commissions accrued to brokers | $ 809,389 | $ 808,749
Total commissions as annualized percentage of average total net assets | 0.40% | 0.37%

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

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- References No definition available. + Details
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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