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Revenue Recognition - Schedule of Disaggregated Operating Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 3,724 $ 3,775 $ 3,589
Total passenger revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 3,598 3,683 3,509
Fare      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,481 1,435 1,277
Total non-fare passenger revenue      
Disaggregation of Revenue [Line Items]      
Total operating revenues 2,117 2,248 2,232
Service fees      
Disaggregation of Revenue [Line Items]      
Total operating revenues 947 1,005 943
Baggage      
Disaggregation of Revenue [Line Items]      
Total operating revenues 746 862 880
Seat selection      
Disaggregation of Revenue [Line Items]      
Total operating revenues 297 264 281
Other      
Disaggregation of Revenue [Line Items]      
Total operating revenues 127 117 128
Other revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 126 $ 92 $ 80