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Revenue Recognition - Current And Non-Current Air Traffic Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Revenue From Contract With Customer [Roll Forward]    
Beginning balance $ 891 $ 733
TrueBlue® points redeemed (360) (196)
TrueBlue® points earned and sold 445 308
Ending balance $ 976 $ 845