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FAIR VALUE MEASUREMENTS - Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Fair Value
Cash equivalents	$ 1,864	$ 1,619
Restricted cash equivalents	198	351
Long-term investments and related	3,079	2,372
Fuel hedge contracts	15	(17)
Level 1
Fair Value
Cash equivalents	1,864	1,619
Restricted cash equivalents	198	351
Long-term investments and related	2,764	2,085
Fuel hedge contracts	0	0
Level 2
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	179	160
Fuel hedge contracts	15	(17)
Level 3
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	136	127
Fuel hedge contracts	$ 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.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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The aggregate value of all restricted investments.

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