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Revenue Recognition - Current And Non-Current Air Traffic Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenue From Contract With Customer [Roll Forward]    
Beginning balance $ 1,072 $ 1,000
TrueBlue® points redeemed passenger (634) (605)
TrueBlue® points earned and sold 713 701
TrueBlue® points redeemed other (26) (24)
Ending balance $ 1,125 $ 1,072