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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 1,145 | $ 1,126
Deferred Tax Liabilities, Intangible Assets | 19 | 15
Deferred Tax Liabilities, Other | 76 | 106
Gross deferred tax liabilities | 1,591 | 1,589
Mileage Plan | (416) | (385)
Inventory obsolescence | (17) | (17)
Employee benefits | (127) | (215)
Net operating losses | (25) | (27)
Other - net | (34) | (103)
Deferred tax assets | (1,033) | (1,201)
Valuation allowance | 20 | 19
Net deferred tax liabilities | 578 | 407
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Liabilities, Other Finite-Lived Assets | 351 | 342
Deferred Tax Assets - Leasing Arrangement | 374 | 381
Deferred Tax Assets, Leasehold Maintenance | (40) | $ (73)
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Income Taxes Receivable | 285 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | $ 413 |

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