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Revenue - Passenger Revenue Breakout (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total passenger revenues $ 6,428 $ 6,329
Passenger    
Disaggregation of Revenue [Line Items]    
Total passenger revenues 5,811 5,712
Passenger non-loyalty    
Disaggregation of Revenue [Line Items]    
Total passenger revenues 4,766 4,680
Passenger loyalty - air transportation    
Disaggregation of Revenue [Line Items]    
Total passenger revenues 800 799
Passenger ancillary sold separately    
Disaggregation of Revenue [Line Items]    
Total passenger revenues $ 245 $ 233