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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]        
Passenger travel $ 2,308 $ 1,773 $ 5,959 $ 3,717
Loyalty revenue - air transportation 107 83 360 196
Loyalty revenue 102 80 287 206
Other revenue 45 36 137 84
Total revenue $ 2,562 $ 1,972 $ 6,743 $ 4,203