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ORGANIZATION AND BUSINESS (Additional Information) (Details)
 1 Months Ended
Jan. 04, 2018
$ / shares
shares
Feb. 21, 2012
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Sep. 30, 2018
$ / shares
$ / Unit
Dec. 31, 2017
$ / shares
 [1]
Sep. 30, 2017
$ / shares
 [1]
Dec. 31, 2016
$ / 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 | $ / Unit         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         $ 24.86 $ 23.34 $ 26.18 $ 37.18
Number of units issued | shares       200,000        
Value of unit issued | $       $ 10,001,000        
Number of registered units         2,080,000,000      
Committee For Uniform Securities Identification Procedure Cusip CUSIP number for UNG's shares changed to 912318300 CUSIP number for UNG's shares changed to 912318201            
Operations Commenced Date       Apr. 18, 2007        
United States [Member] | Open Futures Contracts Long [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts [2]         14,654      
United States [Member] | NYMEX Natural Gas Futures Contracts [Member] | Open Futures Contracts Long [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts         8,654      
United States [Member] | ICE Natural Gas Futures LD1 H Contracts [Member] | Open Futures Contracts Long [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts         6,000      
Prior to Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Net Asset Value Per Unit | $ / shares $ 5.69 $ 5.51   $ 50.00        
Issued units | shares 97,466,476 174,297,828            
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 [Line Items]                
Net Asset Value Per Unit | $ / shares $ 22.76 $ 22.04            
Capital Units, Outstanding | shares 24,366,619 43,574,457            
Creation Baskets [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of units per basket | $ / Unit         100,000      
Redemption Baskets [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of units per basket | $ / Unit         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 to reflect the 1-for-4 reverse share split on a retroactive basis.
[2] Collateral amounted to $19,957,672 on open futures contracts.