v3.26.1
Revenue Recognition - Schedule of Disaggregated Operating Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 1,279 $ 929 $ 2,271 $ 1,841
Total passenger revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,235 898 2,187 1,782
Fare        
Disaggregation of Revenue [Line Items]        
Total operating revenues 613 348 1,062 698
Total non-fare passenger revenue        
Disaggregation of Revenue [Line Items]        
Total operating revenues 622 550 1,125 1,084
Service fees        
Disaggregation of Revenue [Line Items]        
Total operating revenues 266 252 436 486
Baggage        
Disaggregation of Revenue [Line Items]        
Total operating revenues 234 186 449 391
Seat selection        
Disaggregation of Revenue [Line Items]        
Total operating revenues 88 81 171 150
Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 34 31 69 57
Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 44 $ 31 $ 84 $ 59