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Revenue Recognition - Current And Non-Current Air Traffic Liability (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Revenue From Contract With Customer [Roll Forward]    
Beginning balance $ 891 $ 733
TrueBlue® points redeemed (253) (113)
TrueBlue® points earned and sold 289 186
Ending balance $ 927 $ 806