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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 6 Months Ended
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Jun. 30, 2021
contract
$ / shares
$ / item
Mar. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
Jun. 30, 2020
$ / shares
Mar. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of successive valuation days       30 days          
Average daily percentage change in the price of the Benchmark Futures Contract considered       10.00%          
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / item       1,000          
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission   30,000,000              
Net Asset Value Per Unit | $ / shares       $ 12.75 $ 9.61 $ 9.20 $ 10.25 $ 12.43 $ 16.91
Number of units issued | shares     200,000            
Value of unit issued | $     $ 10,001,000            
Number of registered units       2,280,000,000          
Committee For Uniform Securities Identification Procedure Cusip CUSIP number for UNG’s shares changed to 912318300                
Prior to Reverse Split [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Net Asset Value Per Unit | $ / shares $ 5.69   $ 50.00            
Issued units | shares 97,466,476                
Stockholders' Equity, Reverse Stock Split 1-for-4 reverse share split                
Following Reverse Split [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Net Asset Value Per Unit | $ / shares $ 22.76                
Capital Units, Outstanding | shares 24,366,619                
Creation Baskets [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of units per basket | $ / item       100,000          
Redemption Baskets [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of units per basket | $ / item       100,000          
Open Commodity Futures Contracts, Long [Member] | United States Contracts | NYMEX Natural Gas Futures Contracts [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of Contracts | contract       7,612