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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022												Valuation Technique
(in millions)			Total			Level 1			Level 2			Level 3
Cash equivalents			$	2,021		$	2,021		$	—		$	—		(a)
Restricted cash equivalents			206			206			—			—			(a)
Short-term investments
U.S. Government securities			1,587			122			1,465			—			(a)
Corporate obligations			1,614			—			1,614			—			(a)
Other fixed income securities			67			—			67			—			(a)
Long-term investments			1,450			1,305			38			107			(a)(b)
Hedge derivatives, net
Fuel hedge contracts			(47)			—			(47)			—			(a)(b)

			December 31, 2021												Valuation Technique
(in millions)			Total			Level 1			Level 2			Level 3
Cash equivalents			$	5,450		$	5,450		$	—		$	—		(a)
Restricted cash equivalents			635			635			—			—			(a)
Short-term investments
U.S. Government securities			3,386			1,376			2,010			—			(a)
Long-term investments			1,459			1,326			36			97			(a)(b)
Hedge derivatives, net
Fuel hedge contracts			(18)			—			(18)			—			(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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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