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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Change in Contract With Customer, Liability [Roll Forward]    
Beginning balance $ 4,789 $ 4,447
Amounts deferred associated with points awarded 736 466
Ending balance 4,884 4,623
Passenger Customer    
Change in Contract With Customer, Liability [Roll Forward]    
Revenue recognized from points redeemed (624) (278)
Other    
Change in Contract With Customer, Liability [Roll Forward]    
Revenue recognized from points redeemed $ (17) $ (12)