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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 12 Months Ended
Jan. 04, 2018
$ / shares
shares
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Dec. 31, 2021
contract
USD ($)
$ / shares
$ / item
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / 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         $ 12.39 $ 9.20 $ 16.91 $ 24.35
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 912318300              
Stockholders' Equity, Reverse Stock Split   0.25            
Prior to Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure                
Net Asset Value Per Unit | $ / shares $ 5.69 $ 5.69   $ 50.00        
Issued units | shares 97,466,476 97,466,476            
Stockholders' Equity, Reverse Stock Split 0.25              
Following Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure                
Net Asset Value Per Unit | $ / shares $ 22.76 $ 22.76            
Capital Units, Outstanding | shares 24,366,619 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 [Member] | NYMEX Natural Gas Futures Contracts [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure                
Number of Contracts | contract         9,961