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DERIVATIVE INSTRUMENTS - BALANCE SHEET CLASSIFICATION (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive loss | $ (465) | $ (448)
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] | Fuel Hedge Contracts, Current [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Current | 8 | 2
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] | Fuel Hedge Contracts, Noncurrent [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Noncurrent | 3 | 2
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Current | 1 | 3
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Noncurrent | 2 | 7
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Other Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Current | (5) | (3)
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Noncurrent | (5) | (4)
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 | $ (13) | $ (1)

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