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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Passenger revenue $ 13,748 $ 12,759
Passenger    
Disaggregation of Revenue [Line Items]    
Passenger revenue 11,131 10,411
Ticket    
Disaggregation of Revenue [Line Items]    
Passenger revenue 9,833 9,239
Loyalty travel awards    
Disaggregation of Revenue [Line Items]    
Passenger revenue 844 743
Travel-related services    
Disaggregation of Revenue [Line Items]    
Passenger revenue $ 454 $ 429