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DERIVATIVE INSTRUMENTS - FAIR VALUE OF HEDGE POSITIONS (Details) gallons in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) gallons | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Payments for (Proceeds from) Hedge, Investing Activities | $ (38) | $ 14 | $ 19
Interest Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | $ (6) |  |
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | gallons | 425 |  |
Interest rate swaps agreements [Member] | Secured Debt [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | $ 469 |  |

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