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Fair Value (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax	$ 0	$ 0	$ 0
Assets
Available-for-sale investment securities	351,000,000	236,000,000
Recurring [Member]
Assets
Cash and cash equivalents	641,000,000	198,000,000
Available-for-sale investment securities	351,000,000	236,000,000
Aircraft fuel derivatives	8,000,000	0
Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	611,000,000	198,000,000
Available-for-sale investment securities	0	39,000,000
Aircraft fuel derivatives	0	0
Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	30,000,000	0
Available-for-sale investment securities	351,000,000	197,000,000
Aircraft fuel derivatives	8,000,000	0
Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Available-for-sale investment securities	0	0
Aircraft fuel derivatives	$ 0	$ 0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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