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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable trade | $ 305 | $ 277
Salaries, withholdings and payroll taxes | 356 | 456
Ticket taxes and fees | 475 | 242
Aircraft maintenance payable | 82 | 65
Fuel payable | 111 | 188
Dividends payable | 107 | 107
Customer reimbursements and refunds | 7 | 311
Accrued third party services | 273 | 196
Other payable | 166 | 162
Accounts payable | $ 1,882 | $ 2,004

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