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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 1,233 | $ 1,066
Deferred Tax Liabilities, Intangible Assets | 16 | 15
Deferred Tax Liabilities, Other | 58 | 43
Gross deferred tax liabilities | 1,723 | 1,124
Mileage Plan | (337) | (315)
Inventory obsolescence | (15) | (15)
Employee benefits | (179) | (172)
Acquired net operating losses | (13) | (64)
Other - net | (48) | (48)
Deferred tax assets | (1,009) | (614)
Valuation allowance | 1 | 2
Net deferred tax liabilities | 715 | 512
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Liabilities, Other Finite-Lived Assets | 416 | 0
Deferred Tax Assets - Leasing Arrangement | 417 | $ 0
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | 45 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | $ 55 |

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