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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Change in Contract With Customer, Liability [Roll Forward]        
Beginning balance $ 4,884 $ 4,623 $ 4,789 $ 4,447
Amounts deferred associated with points awarded 842 656 1,579 1,121
Ending balance 4,884 4,719 4,884 4,719
Passenger Customer        
Change in Contract With Customer, Liability [Roll Forward]        
Revenue recognized from points redeemed (821) (549) (1,445) (826)
Other        
Change in Contract With Customer, Liability [Roll Forward]        
Revenue recognized from points redeemed $ (21) $ (11) $ (39) $ (23)