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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2022
FAIR VALUE OF FINANCIAL INSTRUMENTS |
Schedule of valuation of UNG's securities using the fair value hierarchy | The following table summarizes the valuation of UNG’s securities at June 30, 2022 using the fair value hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At June 30, 2022 |  | Total |  | Level I |  | Level II |  | Level III
Short-Term Investments | ​ | $ | 336,150,000 | ​ | $ | 336,150,000 | ​ | $ | — | ​ | $ | —
Exchange-Traded Futures Contracts | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
United States Contracts | ​ |  | (134,883,200) | ​ |  | (134,883,200) | ​ |  | — | ​ |  | —
​ The following table summarizes the valuation of UNG’s securities at December 31, 2021 using the fair value hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2021 |  | Total |  | Level I |  | Level II |  | Level III
Short-Term Investments | ​ | $ | 243,443,000 | ​ | $ | 243,443,000 | ​ | $ | — | ​ | $ | —
Exchange-Traded Futures Contracts | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
United States Contracts | ​ |  | 1,362,413 | ​ |  | 1,362,413 | ​ |  | — | ​ |  | —
Schedule of fair value of derivative instruments | Fair Value of Derivative Instruments ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Condensed |  | ​ | ​ |  | ​ | ​
​ | ​ | Statements of | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Financial | ​ | ​ | ​ | ​ | Fair Value at
​ | ​ | Condition | ​ | Fair Value at | ​ | December 31,
Derivatives not Accounted for as Hedging Instruments | ​ | Location | ​ | June 30, 2022 | ​ | 2021
Futures - Commodity Contracts |  | Assets | ​ | $ | (134,883,200) | ​ | $ | 1,362,413
Schedule of effect of derivative instruments on the condensed statements of operations | The Effect of Derivative Instruments on the Condensed Statements of Operations ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | For the six months ended | For the six months ended | ​
​ | ​ | ​ | ​ | June 30, 2022 | ​ | ​ | June 30, 2021 | ​
​ |  | ​ |  | ​ | ​ |  | Change in |  | ​ | ​ |  | Change in |
​ | ​ | Location of | ​ | Realized | ​ | Unrealized | ​ | Realized | ​ | Unrealized | ​
​ | ​ | Gain (Loss) | ​ | gain (Loss) | ​ | Gain (Loss) on | ​ | Gain (Loss) | ​ | Gain (Loss) on | ​
Derivatives not | ​ | on Derivatives | ​ | on Derivatives | ​ | Derivatives | ​ | in Derivatives | ​ | Derivatives | ​
Accounted for as | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​ | Recognized in | ​
Hedging Instruments | ​ | Income | ​ | Income | ​ | Income | ​ | Income | ​ | Income | ​
Futures - Commodity Contracts | ​ | Realized gain (loss) on closed positions | ​ | $ | 293,316,560 |  | ​ | ​ | ​ | $ | 64,321,100 |  | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Change in unrealized gain (loss) on open positions | ​ | ​ | ​ | ​ | $ | (136,245,613) | ​ | ​ | ​ | ​ | $ | 42,023,861 | ​

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI https://asc.fasb.org/topic&trid=2155941 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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