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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of Assets/(Liabilities) Measured at Fair Value on a Recurring Basis

Assets (Liabilities) Measured at Fair Value on a Recurring Basis(1)

			December 31, 2024												Valuation Technique
(in millions)			Total			Level 1			Level 2			Level 3
Cash equivalents			$	1,619		$	1,619		$	—		$	—		(a)
Restricted cash equivalents			351			351			—			—			(a)
Long-term investments and related			2,372			2,085			160			127			(a)(b)
Fuel hedge contracts			(17)			—			(17)			—			(a)(b)

			December 31, 2023												Valuation Technique
(in millions)			Total			Level 1			Level 2			Level 3
Cash equivalents			$	1,545		$	1,545		$	—		$	—		(a)
Restricted cash equivalents			653			653			—			—			(a)
Short-term investments
U.S. Government securities			859			204			655			—			(a)
Corporate obligations			218			—			218			—			(a)
Other fixed income securities			50			—			50			—			(a)
Long-term investments and related			2,867			2,614			134			119			(a)(b)
Fuel hedge contracts			5			—			5			—			(a)(b)

(1)See Note 9, "Employee Benefit Plans," for fair value of benefit plan assets.

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- References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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