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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable trade | $ 278 | $ 339
Salaries, withholdings and payroll taxes | 519 | 536
Ticket taxes and fees | 391 | 318
Aircraft maintenance payable | 49 | 33
Fuel payable | 85 | 86
Dividends payable | 95 | 107
Third party services | 210 | 176
Other payable | 184 | 223
Accounts payable | $ 1,811 | $ 1,818

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