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Fair Value (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Fair value, by balance sheet grouping

The following is a listing of our assets required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy as of December 31, 2024 and 2023 (in millions):

						As of December 31, 2024
						Level 1						Level 2						Level 3						Total
Assets
Cash equivalents						$	1,921					$	—					$	—					$	1,921
Restricted cash equivalents						89						—						—						89
Available-for-sale investment securities						—						1,609						12						1,621

						As of December 31, 2023
						Level 1						Level 2						Level 3						Total
Assets
Cash equivalents						$	724					$	—					$	—					$	724
Available-for-sale investment securities						—						314						16						330
Aircraft fuel derivatives						—						4						—						4

Debt securities, held-to-maturity

The carrying value and estimated fair value of our held-to-maturity investment securities were as follows (in millions):

			December 31, 2024									December 31, 2023
			Carrying Value			Fair Value						Carrying Value			Fair Value
Held-to-maturity investment securities			$	404		$	400					$	234		$	231

X

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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- Definition

Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

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