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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]        
Passenger travel $ 2,162 $ 1,322 $ 3,651 $ 1,945
Loyalty revenue - air transportation 140 66 253 113
Loyalty revenue 95 81 184 126
Other revenue 48 30 93 48
Total revenue $ 2,445 $ 1,499 $ 4,181 $ 2,232