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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 1,282 | $ 1,110
Deferred Tax Liabilities, Intangible Assets | 39 | 0
Other—net | 26 | 23
Gross deferred tax liabilities | 1,347 | 1,133
Mileage Plan | (310) | (208)
Inventory obsolescence | (23) | (22)
Deferred gains | (8) | (8)
Employee benefits | (196) | (167)
Fuel hedge contracts | 0 | (5)
Acquired net operating losses | (289) | 0
Other—net | (62) | (41)
Gross deferred tax assets | (888) | (451)
Valuation allowance | 4 | 0
Net deferred tax liabilities | 463 | $ 682
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | 773 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss | $ 344 |

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