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FAIR VALUE MEASUREMENTS - Fair Value Measurements on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | $ 1,545 | $ 2,021
Restricted cash equivalents | 653 | 206
Long-term investments and related | 2,867 | 1,450
U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 859 | 1,587
Corporate obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 218 | 1,614
Other fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 50 | 67
Fuel hedge contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Hedge derivatives, net | 5 | (47)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | 1,545 | 2,021
Restricted cash equivalents | 653 | 206
Long-term investments and related | 2,614 | 1,305
Level 1 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 204 | 122
Level 1 | Corporate obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 0 | 0
Level 1 | Other fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 0 | 0
Level 1 | Fuel hedge contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Hedge derivatives, net | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 134 | 38
Level 2 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 655 | 1,465
Level 2 | Corporate obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 218 | 1,614
Level 2 | Other fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 50 | 67
Level 2 | Fuel hedge contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Hedge derivatives, net | 5 | (47)
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | 0 | 0
Restricted cash equivalents | 0 | 0
Long-term investments and related | 119 | 107
Level 3 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 0 | 0
Level 3 | Corporate obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 0 | 0
Level 3 | Other fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Short-term investments | 0 | 0
Level 3 | Fuel hedge contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Hedge derivatives, net | $ 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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