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Cover
May 27, 2020
Entity Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 27, 2020
Entity File Number 001-06033
Entity Registrant Name UNITED AIRLINES HOLDINGS, INC.
Entity Central Index Key 0000100517
Entity Tax Identification Number 36-2675207
Entity Incorporation, State or Country Code DE
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
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol UAL
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
UNITED AIRLINES, INC.  
Entity Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 27, 2020
Entity File Number 001-10323
Entity Registrant Name UNITED AIRLINES, INC.
Entity Central Index Key 0000319687
Entity Tax Identification Number 74-2099724
Entity Incorporation, State or Country Code DE
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