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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 22, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-06033    
Entity Registrant Name United Airlines Holdings, Inc.    
Entity Address, Address Line One 233 South 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    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-2675207    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 17.9
Entity Common Stock, Shares Outstanding   328,025,881  
Documents Incorporated by Reference
Certain information required by Items 10, 11, 12 and 13 of Part III of this Form 10-K is incorporated by reference for United Airlines Holdings, Inc. from its definitive proxy statement for its 2024 Annual Meeting of Stockholders.
    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Entity Central Index Key 0000100517    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol UAL    
Security Exchange Name NASDAQ    
Preferred Stock Purchase Rights      
Document Information [Line Items]      
Title of 12(b) Security Preferred Stock Purchase Rights    
United Airlines, Inc.      
Document Information [Line Items]      
Entity File Number 001-10323    
Entity Registrant Name United Airlines, Inc.    
Entity Address, Address Line One 233 South 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    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-2099724    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   1,000  
Entity Central Index Key 0000319687