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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of UNG's securities using the fair value hierarchy (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Fair value of securities	$ 275,850,000	$ 243,443,000
Exchange-Traded Futures Contracts | United States Contracts
Schedule of Trading Securities and Other Trading Assets
Fair value of securities	(101,887,101)	1,362,413
Level 1 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Fair value of securities	275,850,000	243,443,000
Level 1 | Exchange-Traded Futures Contracts | United States Contracts
Schedule of Trading Securities and Other Trading Assets
Fair value of securities	$ (101,887,101)	$ 1,362,413

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

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+ References

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