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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Available-for-sale investment securities	$ 1,137	$ 351
Recurring
Assets
Cash equivalents	1,460	641
Available-for-sale investment securities	1,137	351
Aircraft fuel derivatives		8
Recurring | Level 1
Assets
Cash equivalents	1,330	611
Available-for-sale investment securities	0	0
Aircraft fuel derivatives		0
Recurring | Level 2
Assets
Cash equivalents	130	30
Available-for-sale investment securities	1,137	351
Aircraft fuel derivatives		8
Recurring | Level 3
Assets
Cash equivalents	0	0
Available-for-sale investment securities	$ 0	0
Aircraft fuel derivatives		$ 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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