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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Change in Contract With Customer, Liability [Roll Forward]    
Beginning balance $ 4,849 $ 4,916
Amounts deferred associated with points awarded 817 893
Ending balance 4,841 4,987
Passenger Customer    
Change in Contract With Customer, Liability [Roll Forward]    
Revenue recognized from points redeemed (800) (799)
Other    
Change in Contract With Customer, Liability [Roll Forward]    
Revenue recognized from points redeemed $ (25) $ (23)