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DERIVATIVE INSTRUMENTS - FAIR VALUE OF HEDGE POSITIONS (Details) gallons in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) gallons aircraft numberOfInterestRateSwaps | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Payments for (Proceeds from) Hedge, Investing Activities | $ 14 | $ 19 | $ (21)
Interest Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | $ (10) |  |
B737-800 [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Capital Leased Assets, Number of Units | aircraft | 1 |  |
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | gallons | 300 |  |
Interest rate swaps agreements [Member] | Secured Debt [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | $ 614 |  |
Number of interest rate swap agreements | numberOfInterestRateSwaps | 13 |  |

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