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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 1,126 | $ 1,233
Deferred Tax Liabilities, Intangible Assets | 15 | 16
Deferred Tax Liabilities, Other | 106 | 58
Gross deferred tax liabilities | 1,589 | 1,723
Mileage Plan | (385) | (337)
Inventory obsolescence | (17) | (15)
Employee benefits | (215) | (179)
Net operating losses | (27) | (13)
Other - net | (103) | (48)
Deferred tax assets | (1,201) | (1,009)
Valuation allowance | 19 | 1
Net deferred tax liabilities | 407 | 715
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Liabilities, Other Finite-Lived Assets | 342 | 416
Deferred Tax Assets - Leasing Arrangement | 381 | 417
Deferred Tax Assets, Leasehold Maintenance | (73) | $ 0
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | 644 |
Income Taxes Receivable | 225 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | 562 |
Operating Loss, Available to Offset Prior Year Income | $ 85 |

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