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SUPPLEMENTAL FINANCIAL INFORMATION - Accrued Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accrued Liabilities, Current [Abstract] |  |
Voluntary Separation Program (c) | $ 65 | $ 72
Profitsharing and savings plans | 141 | 167
Vacation pay | 516 | 484
Health | 163 | 261
Workers compensation | 133 | 164
Property and income taxes | 63 | 37
Interest | 34 | 45
Contract labor and non-contract incentive accruals | 2,022 | 563
Other | 469 | 250
Accrued liabilities | 3,606 | $ 2,043
Unusual or Infrequent Item, or Both [Line Items] |  |
Incremental expense | 534 |
Flight Attendant |  |
Unusual or Infrequent Item, or Both [Line Items] |  |
Incremental expense | 180 |
Pilots |  |
Unusual or Infrequent Item, or Both [Line Items] |  |
Incremental expense | $ 354 |

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