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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of UNG's securities using the fair value hierarchy (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	$ 532,370,156	$ 70,950,000
United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	80,696,279	40,072,461
OTC Commodity Swap Contract
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	(2,205)	14,903,211
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	532,370,156	70,950,000
Level 1 | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	80,696,279	40,072,461
Level 2 | OTC Commodity Swap Contract
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value of securities	$ (2,205)	$ 14,903,211

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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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