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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of UNG's securities using the fair value hierarchy (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	$ 145,950,000	$ 532,370,156
United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	1,475,440	80,696,279
OTC Commodity Swap Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	(1,631)	(2,205)
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	145,950,000	532,370,156
Level 1 | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	1,475,440	80,696,279
Level 2 | OTC Commodity Swap Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	$ (1,631)	$ (2,205)

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- Definition

Line items represents the information pertaining to fair value of financial instruments.

+ References

No definition available.

+ Details

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- 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/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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