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Document and Entity Information
Dec. 06, 2021
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0000100517
Document Type 8-K
Document Period End Date Dec. 06, 2021
Entity Registrant Name UNITED AIRLINES HOLDINGS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-06033
Entity Tax Identification Number 36-2675207
Entity Address, Address Line One 233 S. Wacker Drive
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60606
City Area Code (872)
Local Phone Number 825-4000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, $0.01 par value
Trading Symbol UAL
Security Exchange Name NASDAQ
Warrant [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Preferred Stock Purchase Rights
Security Exchange Name NASDAQ