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Document And Entity Information
 3 Months Ended
Mar. 31, 2022
shares
Document And Entity Information  
Document Type 10-Q
Amendment Flag false
Document Quarterly Report true
Document Period End Date Mar. 31, 2022
Document Transition Report false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus Q1
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 0
Entity Emerging Growth Company false
Entity Small Business false
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Shell Company false