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FAIR VALUE MEASUREMENTS - Fair Value Measurements on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Cash equivalents | $ 1,619 | $ 1,545
Restricted cash equivalents | 351 | 653
Long-term investments and related | 2,372 | 2,867
U.S. Government securities |  |
Fair Value |  |
Short-term investments |  | 859
Corporate obligations |  |
Fair Value |  |
Short-term investments |  | 218
Other fixed income securities |  |
Fair Value |  |
Short-term investments |  | 50
Fuel hedge contracts |  |
Fair Value |  |
Fuel hedge contracts | (17) | 5
Level 1 |  |
Fair Value |  |
Cash equivalents | 1,619 | 1,545
Restricted cash equivalents | 351 | 653
Long-term investments and related | 2,085 | 2,614
Level 1 | U.S. Government securities |  |
Fair Value |  |
Short-term investments |  | 204
Level 1 | Corporate obligations |  |
Fair Value |  |
Short-term investments |  | 0
Level 1 | Other fixed income securities |  |
Fair Value |  |
Short-term investments |  | 0
Level 1 | Fuel hedge contracts |  |
Fair Value |  |
Fuel hedge contracts | 0 | 0
Level 2 |  |
Fair Value |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 160 | 134
Level 2 | U.S. Government securities |  |
Fair Value |  |
Short-term investments |  | 655
Level 2 | Corporate obligations |  |
Fair Value |  |
Short-term investments |  | 218
Level 2 | Other fixed income securities |  |
Fair Value |  |
Short-term investments |  | 50
Level 2 | Fuel hedge contracts |  |
Fair Value |  |
Fuel hedge contracts | (17) | 5
Level 3 |  |
Fair Value |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 127 | 119
Level 3 | U.S. Government securities |  |
Fair Value |  |
Short-term investments |  | 0
Level 3 | Corporate obligations |  |
Fair Value |  |
Short-term investments |  | 0
Level 3 | Other fixed income securities |  |
Fair Value |  |
Short-term investments |  | 0
Level 3 | Fuel hedge contracts |  |
Fair Value |  |
Fuel hedge contracts | $ 0 | $ 0

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