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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 12 Months Ended
Jan. 04, 2018
$ / shares
shares
Feb. 21, 2012
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
$ / item
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
 [1]
Dec. 31, 2017
$ / shares
 [1]
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         $ 9.20 $ 16.91 $ 24.35 $ 23.34
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 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      
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.