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COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES - Summary of Warrants Outstanding (Details) - $ / shares
shares in Millions
Dec. 31, 2024
Aug. 31, 2024
Class of Warrant or Right [Line Items]    
Number of Shares of UAL Common Stock (in shares) 3,513,714.0  
Exercise Price (in dollars per share)   $ 31.50
PSP2 Warrants    
Class of Warrant or Right [Line Items]    
Number of Shares of UAL Common Stock (in shares) 2,011,924.0  
Exercise Price (in dollars per share) $ 43.26  
PSP3 Warrants    
Class of Warrant or Right [Line Items]    
Number of Shares of UAL Common Stock (in shares) 1,501,790.0  
Exercise Price (in dollars per share) $ 53.92