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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Assets
Available-for-sale investment securities	$ 170	$ 337
Fair Value, Recurring
Assets
Cash equivalents	599	665
Available-for-sale investment securities	170	337
Equity investment securities	11	8
Aircraft fuel derivatives	8	3
Fair Value, Recurring | Level 1
Assets
Cash equivalents	599	665
Available-for-sale investment securities	0	0
Equity investment securities	11	8
Aircraft fuel derivatives	0	0
Fair Value, Recurring | Level 2
Assets
Cash equivalents	0	0
Available-for-sale investment securities	157	324
Equity investment securities	0	0
Aircraft fuel derivatives	8	3
Fair Value, Recurring | Level 3
Assets
Cash equivalents	0	0
Available-for-sale investment securities	13	13
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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