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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 1,605 | $ 1,312
Deferred Tax Liabilities, Intangible Assets | 16 | 17
Deferred Tax Liabilities, Other | 3 | 49
Gross deferred tax liabilities | 1,916 | 1,734
Mileage Plan | (455) | (436)
Inventory obsolescence | (23) | (21)
Employee benefits | (159) | (145)
Net operating losses | (166) | (28)
Other - net | (77) | (88)
Deferred tax assets | (1,237) | (1,177)
Valuation allowance | 16 | 17
Net deferred tax liabilities | 695 | 574
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance | 16 | 17
Deferred Tax Liabilities, Other Finite-Lived Assets | 292 | 356
Deferred Tax Assets - Leasing Arrangement | 329 | 392
Deferred Tax Assets, Leasehold Maintenance | (28) | $ (67)
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | 684 |
Income Taxes Receivable | 4 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | $ 467 |

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