XML 21 R7.htm IDEA: XBRL DOCUMENT
v3.23.3

Condensed Statements of Operations (Parenthetical) | 9 Months Ended
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Sep. 30, 2023
Condensed Statements of Operations |
Interest income | 5.00%

X
- Definition The maximum percentage of paid in kind amount of interest income. + References No definition available. + Details
Name: | ung_InterestIncomeMaximumPercentageOfPaidInKind
Namespace Prefix: | ung_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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