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Revenue Recognition - Disaggregated Operating Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 2,060 $ 1,250 $ 2,508
Total passenger revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 2,000 1,207 2,445
Fare      
Disaggregation of Revenue [Line Items]      
Total operating revenues 806 548 1,205
Total non-fare passenger revenue      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,194 659 1,240
Baggage      
Disaggregation of Revenue [Line Items]      
Total operating revenues 457 229 496
Service fees      
Disaggregation of Revenue [Line Items]      
Total operating revenues 521 303 488
Seat selection      
Disaggregation of Revenue [Line Items]      
Total operating revenues 170 84 187
Other      
Disaggregation of Revenue [Line Items]      
Total operating revenues 46 43 69
Other revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 60 $ 43 $ 63