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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Marketable securities

The carrying values of investment securities consisted of the following at December 31, 2020 and 2019 (in millions):

						December 31, 2020						December 31, 2019
Available-for-sale securities
Time deposits						$	1,130					$	325
Commercial paper						—						20
Debt securities						7						6
Total available-for-sale securities						1,137						351
Held-to-maturity securities
Corporate bonds						—						21
Total held-to-maturity securities						—						21
Total investment securities						$	1,137					$	372

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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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=120391452&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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