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DERIVATIVE INSTRUMENTS - BALANCE SHEET CLASSIFICATION (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive loss | $ (303) | $ (310)
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] | Fuel Hedge Contracts, Current [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Current | 2 | 3
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] | Fuel Hedge Contracts, Noncurrent [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Noncurrent | 2 | 4
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Other Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Current | (5) | (6)
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Noncurrent | (13) | (13)
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Accumulated Other Comprehensive Loss [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive loss | $ 18 | $ 19

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