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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets
Available-for-sale investment securities	$ 680	$ 800
Equity investment securities	11	26
Fair Value, Recurring
Assets
Cash equivalents	1,004	1,515
Available-for-sale investment securities	680	800
Equity investment securities	11	26
Aircraft fuel derivatives	3	0
Fair Value, Recurring | Level 1
Assets
Cash equivalents	1,004	1,515
Available-for-sale investment securities	0	0
Equity investment securities	11	26
Aircraft fuel derivatives	0	0
Fair Value, Recurring | Level 2
Assets
Cash equivalents	0	0
Available-for-sale investment securities	680	800
Equity investment securities	0	0
Aircraft fuel derivatives	3	0
Fair Value, Recurring | Level 3
Assets
Cash equivalents	0	0
Available-for-sale investment securities	0	0
Equity investment securities	0	0
Aircraft fuel derivatives	$ 0	$ 0

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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 value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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