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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]    
Passenger travel $ 1,888 $ 2,026
Loyalty revenue - air transportation 167 156
Loyalty revenue 107 100
Other revenue 47 46
Total operating revenue $ 2,209 $ 2,328