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SUPPLEMENTAL FINANCIAL INFORMATION - Accounts Payable (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Accounts Payable [Abstract] |  |
Accounts payable trade | $ 265 | $ 277
Salaries, withholdings and payroll taxes | 400 | 456
Ticket taxes and fees | 302 | 242
Aircraft maintenance payable | 140 | 65
Fuel payable | 161 | 188
Dividends payable | 107 | 107
Customer reimbursements and refunds | 8 | 311
Accrued third party services | 269 | 196
Other payable | 210 | 162
Accounts payable | $ 1,862 | $ 2,004

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