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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Passenger revenue                      
Passenger travel                 $ 5,304 $ 2,551 $ 7,395
Loyalty revenue - air transportation                 305 182 391
Other revenue                      
Loyalty revenue                 306 168 201
Other revenue                 122 56 107
Total revenue $ 1,834 $ 1,972 $ 1,499 $ 733 $ 661 $ 492 $ 215 $ 1,588 $ 6,037 $ 2,957 $ 8,094