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Revenue Recognition - Contract Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]    
Air traffic liability - passenger travel $ 1,443 $ 1,323
Air traffic liability - loyalty program (air transportation) 976 891
Deferred revenue 547 613
Total $ 2,966 $ 2,827