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Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2022
Nov. 01, 2022
Document And Entity Information    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Entity File Number 001-33096  
Entity Registrant Name United States Natural Gas Fund, LP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-5576760  
Entity Address, Address Line One 1850 Mt. Diablo Boulevard, Suite 640  
Entity Address, City or Town Walnut Creek  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94596  
City Area Code 510  
Local Phone Number 522-9600  
Entity Central Index Key 0001376227  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Title of 12(b) Security Shares of United States Natural Gas Fund, LP  
Security Exchange Name NYSE  
Trading Symbol UNG  
Entity Common Stock, Shares Outstanding   26,784,588
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false