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FAIR VALUE MEASUREMENTS - Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Cash equivalents | $ 2,840 | $ 1,545
Restricted cash equivalents | 397 | 653
Long-term investments and related | 2,445 | 2,867
Fuel hedge contracts | (23) | 5
U.S. Government securities |  |
Fair Value |  |
Short-term investments | 100 | 859
Corporate obligations |  |
Fair Value |  |
Short-term investments | 10 | 218
Other fixed income securities |  |
Fair Value |  |
Short-term investments | 14 | 50
Level 1 |  |
Fair Value |  |
Cash equivalents | 2,840 | 1,545
Restricted cash equivalents | 397 | 653
Long-term investments and related | 2,188 | 2,614
Fuel hedge contracts | 0 | 0
Level 1 | U.S. Government securities |  |
Fair Value |  |
Short-term investments | 0 | 204
Level 1 | Corporate obligations |  |
Fair Value |  |
Short-term investments | 0 | 0
Level 1 | Other fixed income securities |  |
Fair Value |  |
Short-term investments | 0 | 0
Level 2 |  |
Fair Value |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 143 | 134
Fuel hedge contracts | (23) | 5
Level 2 | U.S. Government securities |  |
Fair Value |  |
Short-term investments | 100 | 655
Level 2 | Corporate obligations |  |
Fair Value |  |
Short-term investments | 10 | 218
Level 2 | Other fixed income securities |  |
Fair Value |  |
Short-term investments | 14 | 50
Level 3 |  |
Fair Value |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 114 | 119
Fuel hedge contracts | 0 | 0
Level 3 | U.S. Government securities |  |
Fair Value |  |
Short-term investments | 0 | 0
Level 3 | Corporate obligations |  |
Fair Value |  |
Short-term investments | 0 | 0
Level 3 | Other fixed income securities |  |
Fair Value |  |
Short-term investments | $ 0 | $ 0

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