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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 964 | $ 1,282
Deferred Tax Liabilities, Intangible Assets | 14 | 39
Other—net | 43 | 26
Gross deferred tax liabilities | 1,021 | 1,347
Mileage Plan | (208) | (310)
Inventory obsolescence | (16) | (23)
Deferred gains | (5) | (8)
Employee benefits | (154) | (196)
Acquired net operating losses | (127) | (289)
Other—net | (57) | (62)
Gross deferred tax assets | (567) | (888)
Valuation allowance | 0 | 4
Net deferred tax liabilities | 454 | $ 463
Operating Loss Carryforwards [Line Items] |  |
Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Asset, Income Tax Expense | 280 |
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | 525 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | $ 254 |
Minimum [Member] | Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2029 |
Minimum [Member] | State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2028 |
Maximum [Member] | Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2036 |
Maximum [Member] | State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2035 |

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