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FAIR VALUE MEASUREMENTS - Fair Value Of Financial Instruments On A Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | $ 1,274 |
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 1,274 | $ 1,510
Total Assets | 1,283 | 1,529
Fair Value, Measurements, Recurring | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments | 9 | 8
Fair Value, Measurements, Recurring | Fuel hedge contracts - call options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 11
Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 292 | 387
Fair Value, Measurements, Recurring | Equity mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 7 | 5
Fair Value, Measurements, Recurring | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 134 | 192
Fair Value, Measurements, Recurring | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 112 | 115
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 698 | 763
Fair Value, Measurements, Recurring | Municipal securities and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 31 | 38
Fair Value, Measurements, Recurring | Debt Security, Government, Non-US |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities |  | 10
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 299 | 392
Total Assets | 299 | 392
Level 1 | Fair Value, Measurements, Recurring | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Fuel hedge contracts - call options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 0
Level 1 | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 292 | 387
Level 1 | Fair Value, Measurements, Recurring | Equity mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 7 | 5
Level 1 | Fair Value, Measurements, Recurring | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Corporate notes and bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Municipal securities and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities |  | 0
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 966 | 1,118
Total Assets | 975 | 1,137
Level 2 | Fair Value, Measurements, Recurring | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments | 9 | 8
Level 2 | Fair Value, Measurements, Recurring | Fuel hedge contracts - call options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 11
Level 2 | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Equity mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 127 | 192
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 112 | 115
Level 2 | Fair Value, Measurements, Recurring | Corporate notes and bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 696 | 763
Level 2 | Fair Value, Measurements, Recurring | Municipal securities and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 31 | 38
Level 2 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities |  | 10
Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 9 | 0
Total Assets | 9 | 0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Fuel hedge contracts - call options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 0
Level 3 | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Equity mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 7 | 0
Level 3 | Fair Value, Measurements, Recurring | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Corporate notes and bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | 2 | 0
Level 3 | Fair Value, Measurements, Recurring | Municipal securities and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities | $ 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Marketable securities |  | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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