v3.26.3
Revenue - Passenger Revenue Breakout (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Total passenger revenues $ 8,422 $ 6,949 $ 24,104 $ 20,621
Passenger        
Disaggregation of Revenue [Line Items]        
Total passenger revenues 7,754 6,313 22,091 18,751
Passenger non-loyalty        
Disaggregation of Revenue [Line Items]        
Total passenger revenues 6,122 4,896 17,414 15,110
Passenger loyalty - air transportation        
Disaggregation of Revenue [Line Items]        
Total passenger revenues 734 805 2,188 2,475
Passenger ancillary sold separately        
Disaggregation of Revenue [Line Items]        
Total passenger revenues $ 898 $ 612 $ 2,489 $ 1,166