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Special Items (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unusual or Infrequent Items, or Both [Abstract]        
Spirit-related costs   $ 532 $ 92 $ 28
Union contract costs $ 26 26 105 33
Voluntary opt-out costs   17 0 0
Embraer E190 fleet transition   15 0 52
Other special items   1 0 0
Total special items   $ 591 $ 197 $ 113