XML 37 R22.htm IDEA: XBRL DOCUMENT v3.19.1
ORGANIZATION AND BUSINESS (Additional Information) (Details)
 1 Months Ended
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Mar. 31, 2019
Contracts
$ / shares
$ / Unit
Dec. 31, 2018
$ / shares
Mar. 31, 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 | $ / 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       $ 23.42 $ 24.35 $ 22.54 $ 23.34
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            
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 | Contracts [2]       13,324      
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 | Contracts       8,324      
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 | Contracts       5,000      
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 | shares 97,466,476            
Stockholders' Equity, Reverse Stock 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            
Capital Units, Outstanding | shares 24,366,619            
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 for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.
[2] Collateral amounted to $77,620,675 on open futures contracts.