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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

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