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Special Items (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Special items          
Union contract costs $ 26 $ 26 $ 8 $ 26 $ 104
Voluntary opt-out costs   1 0 17 0
Spirit-related costs   0 25 532 64
Embraer E190 fleet transition costs   0 0 15 0
Total special items   $ 27 $ 33 $ 590 $ 168