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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Marketable Securities

The carrying values of investment securities consisted of the following at December 31, 2019 and 2018 (in millions):

		December 31, 2019				December 31, 2018
Available-for-sale securities
Time deposits		$	325			$	190
U.S. Treasury		—				39
Commercial paper		20				—
Debt securities		6				7
Total available-for-sale securities		351				236
Held-to-maturity securities
U.S. Treasury		—				180
Corporate bonds		21				—
Total held-to-maturity securities		21				180
Total investment securities		$	372			$	416

Property, Plant and Equipment

Estimated useful lives and residual values for our property and equipment are as follows:

Property and Equipment Type		Estimated Useful Life		Residual Value
Aircraft		25 years		20	%
Inflight entertainment systems		5-10 years		0	%
Aircraft parts		Fleet life		10	%
Flight equipment leasehold improvements		Lower of lease term or economic life		0	%
Ground property and equipment		2-10 years		0	%
Leasehold improvements—other		Lower of lease term or economic life		0	%
Buildings on leased land		Lease term		0	%

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- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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