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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable trade | $ 503 | $ 339
Salaries, withholdings and payroll taxes | 452 | 536
Ticket taxes and fees | 302 | 318
Aircraft maintenance payable | 43 | 33
Fuel payable | 65 | 86
Dividends payable | 0 | 107
Third party services | 177 | 176
Other payable | 166 | 223
Accounts payable | $ 1,708 | $ 1,818

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