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SUPPLEMENTAL FINANCIAL INFORMATION - Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Voluntary Separation Program | $ 48 | $ 65
Profitsharing and savings plans | 151 | 141
Vacation pay | 657 | 516
Health | 192 | 163
Workers compensation | 178 | 133
Property and income taxes | 53 | 63
Interest | 23 | 34
Bonus and incentive pay | 208 | 2,022
Reinsurance payable | 249 | 190
Aircraft maintenance | 92 | 26
Other | 355 | 253
Accrued liabilities | $ 2,206 | $ 3,606

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