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FAIR VALUE MEASUREMENTS - Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Cash equivalents | $ 1,854 | $ 2,021
Restricted cash equivalents | 134 | 206
Long-term investments and related | 1,647 | 1,450
Fuel hedge contracts | 12 | (47)
U.S. Government securities |  |
Fair Value |  |
Short-term investments | 1,162 | 1,587
Corporate obligations |  |
Fair Value |  |
Short-term investments | 857 | 1,614
Asset-backed securities |  |
Fair Value |  |
Short-term investments | 86 |
Other fixed income securities |  |
Fair Value |  |
Short-term investments | 65 | 67
Level 1 |  |
Fair Value |  |
Cash equivalents | 1,854 | 2,021
Restricted cash equivalents | 134 | 206
Long-term investments and related | 1,342 | 1,305
Fuel hedge contracts | 0 | 0
Level 1 | U.S. Government securities |  |
Fair Value |  |
Short-term investments | 239 | 122
Level 1 | Corporate obligations |  |
Fair Value |  |
Short-term investments | 0 | 0
Level 1 | Asset-backed securities |  |
Fair Value |  |
Short-term investments | 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 | 130 | 38
Fuel hedge contracts | 12 | (47)
Level 2 | U.S. Government securities |  |
Fair Value |  |
Short-term investments | 923 | 1,465
Level 2 | Corporate obligations |  |
Fair Value |  |
Short-term investments | 857 | 1,614
Level 2 | Asset-backed securities |  |
Fair Value |  |
Short-term investments | 86 |
Level 2 | Other fixed income securities |  |
Fair Value |  |
Short-term investments | 65 | 67
Level 3 |  |
Fair Value |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 175 | 107
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 | Asset-backed securities |  |
Fair Value |  |
Short-term investments | 0 |
Level 3 | Other fixed income securities |  |
Fair Value |  |
Short-term investments | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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