v3.26.3
Revenue Recognition - Schedule of Disaggregated Operating Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 1,355 $ 886 $ 3,626 $ 2,727
Total passenger revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,327 854 3,514 2,636
Fare        
Disaggregation of Revenue [Line Items]        
Total operating revenues 665 330 1,727 1,028
Total non-fare passenger revenue        
Disaggregation of Revenue [Line Items]        
Total operating revenues 662 524 1,787 1,608
Service fees        
Disaggregation of Revenue [Line Items]        
Total operating revenues 281 234 717 720
Baggage        
Disaggregation of Revenue [Line Items]        
Total operating revenues 239 178 688 569
Seat selection        
Disaggregation of Revenue [Line Items]        
Total operating revenues 91 78 262 228
Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 51 34 120 91
Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 28 $ 32 $ 112 $ 91