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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Passenger revenue                      
Passenger travel                 $ 2,551 $ 7,395 $ 7,061
Loyalty revenue - air transportation                 182 391 320
Other revenue                      
Loyalty revenue                 168 201 168
Other revenue                 56 107 109
Total revenue $ 661 $ 492 $ 215 $ 1,588 $ 2,031 $ 2,086 $ 2,105 $ 1,871 $ 2,957 $ 8,094 $ 7,658