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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Excess of tax over book depreciation | $ 1,110,000,000 | $ 1,042,000,000
Other—net | 23,000,000 | 22,000,000
Gross deferred tax liabilities | 1,133,000,000 | 1,064,000,000
Mileage Plan | (208,000,000) | (206,000,000)
Inventory obsolescence | (22,000,000) | (20,000,000)
Deferred gains | (8,000,000) | (10,000,000)
Employee benefits | (167,000,000) | (166,000,000)
Fuel hedge contracts | (5,000,000) | (5,000,000)
Other—net | (41,000,000) | (24,000,000)
Gross deferred tax assets | 451,000,000 | 431,000,000
Net deferred tax liabilities | 682,000,000 | $ 633,000,000
Deferred tax assets valuation allowance | $ 0 |

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