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Condensed Statements of Operations (Parenthetical)	6 Months Ended
	Jun. 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