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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Jan. 04, 2018
$ / shares
shares
Feb. 21, 2012
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Dec. 31, 2019
contract
$ / shares
$ / item
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
 [1]
Dec. 31, 2016
$ / shares
 [1]
Organization, Consolidation and Presentation of Financial Statements Disclosure                
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         $ 16.91 $ 24.35 $ 23.34 $ 37.18
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 CUSIP number for UNG's shares changed to 912318201            
Operations Commenced Date       Apr. 18, 2007        
Reverse unit split ratio 4 4            
Pre-split units of USNG automatically exchanged for one post-split unit 4 4            
Prior to Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure                
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                
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                
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 Futures Contracts - Long [Member] | United States Contracts                
Organization, Consolidation and Presentation of Financial Statements Disclosure                
Number of Contracts         20,310 [2] 12,935 [3]    
Open 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         20,310      
[1] On January 4, 2018, there was a 1for4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.
[2] Collateral amounted to $83,410,316 on open futures contracts.
[3] Collateral amounted to $100,299,442 on open futures contracts.