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Revenue Recognition - Disaggregated Operating Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 973 $ 967 $ 1,838 $ 1,815
Total passenger revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 950 945 1,795 1,775
Fare        
Disaggregation of Revenue [Line Items]        
Total operating revenues 355 361 679 664
Total non-fare passenger revenue        
Disaggregation of Revenue [Line Items]        
Total operating revenues 595 584 1,116 1,111
Service fees        
Disaggregation of Revenue [Line Items]        
Total operating revenues 266 245 482 462
Baggage        
Disaggregation of Revenue [Line Items]        
Total operating revenues 233 232 437 453
Seat selection        
Disaggregation of Revenue [Line Items]        
Total operating revenues 67 74 131 146
Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 29 33 66 50
Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 23 $ 22 $ 43 $ 40