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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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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- Definition 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 + Details
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