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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Sep. 30, 2019
$ / shares
$ / item
Dec. 31, 2018
$ / shares
Sep. 30, 2018
$ / shares
Jan. 05, 2018
shares
Dec. 31, 2017
$ / shares
 [1]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
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       $ 19.93 $ 24.35 $ 24.86   $ 23.34
Number of units issued     200,000          
Value of unit issued | $     $ 10,001,000          
Number of registered units       2,280,000,000        
Issued units             912,318,300  
Prior to Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Net Asset Value Per Unit | $ / shares $ 5.69   $ 50.00          
Issued units 97,466,476              
Stockholders' Equity Note, Stock Split, Conversion Ratio 4              
Following Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Net Asset Value Per Unit | $ / shares $ 22.76              
Capital Units, Outstanding 24,366,619              
Creation Baskets [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of units per basket | $ / item       100,000        
Redemption Baskets [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of units per basket | $ / item       100,000        
Open Futures Contracts - Long [Member] | United States Contracts | NYMEX Natural Gas Futures Contracts [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts       11,023        
Open Futures Contracts - Long [Member] | United States Contracts | ICE Natural Gas Futures LD1 H Contracts [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts       0        
[1] On January 4, 2018, there was a 1for4 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 1for4 reverse share split on a retroactive basis.