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Available-for-Sale Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract] |
Summary of Available-for-Sale Debt Securities at Estimated Fair Value | The following table summarizes our available-for-sale debt securities (in millions):
|  | December 31, 2019 |  | December 31, 2018
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
U.S. treasury securities |  | $ | 2,433 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,433 |  |  | $ | 3,978 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 3,969 |
Certificates of deposit |  | 3,517 |  |  | — |  |  | — |  |  | 3,517 |  |  | 4,361 |  |  | — |  |  | — |  |  | 4,361 |
U.S. government agencies securities |  | 1,081 |  |  | — |  |  | — |  |  | 1,081 |  |  | 943 |  |  | — |  |  | (5 | ) |  | 938 |
Non-U.S. government securities |  | 174 |  |  | — |  |  | — |  |  | 174 |  |  | 307 |  |  | — |  |  | (2 | ) |  | 305 |
Corporate debt securities |  | 9,203 |  |  | 2 |  |  | (1 | ) |  | 9,204 |  |  | 13,095 |  |  | 1 |  |  | (29 | ) |  | 13,067 |
Residential mortgage and asset-backed securities |  | 91 |  |  | — |  |  | — |  |  | 91 |  |  | 1,532 |  |  | — |  |  | (8 | ) |  | 1,524 |
Total |  | $ | 16,499 |  |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 16,500 |  |  | $ | 24,216 |  |  | $ | 1 |  |  | $ | (53 | ) |  | $ | 24,164 |
Summary of the Classification of Available-for-Sale Debt Securities | The following table summarizes the classification of our available-for-sale debt securities in our Consolidated Balance Sheets (in millions):
| December 31, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 2,291 |  |  | $ | 10,592 |
Short-term marketable securities | 12,721 |  |  | 12,149 |
Long-term marketable securities | 1,488 |  |  | 1,423 |
Total | $ | 16,500 |  |  | $ | 24,164 |
Summary of Available-for-Sale Debt Securities by Contractual Maturity | The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
| December 31, 2019
| Amortized Cost |  | Fair Value
Within one year | $ | 15,011 |  |  | $ | 15,012 |
After one year through five years | 1,465 |  |  | 1,465 |
After five years | 23 |  |  | 23 |
Total | $ | 16,499 |  |  | $ | 16,500 |
Summary of Available-for-Sale Debt Securities in a Continuous Loss Position Deemed not to be Other-than-Temporarily Impaired | The following table summarizes our available-for-sale debt securities that were in a continuous unrealized loss position, but were not deemed to be other-than-temporarily impaired (in millions):
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total
|  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | (1 | ) |  | $ | 1,866 |  |  | $ | — |  |  | $ | 4 |  |  | $ | (1 | ) |  | $ | 1,870 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | — |  |  | $ | 896 |  |  | $ | (9 | ) |  | $ | 1,383 |  |  | $ | (9 | ) |  | $ | 2,279 |
U.S. government agencies securities |  | — |  |  | 30 |  |  | (5 | ) |  | 553 |  |  | (5 | ) |  | 583 |
Non-U.S. government securities |  | — |  |  | 86 |  |  | (2 | ) |  | 192 |  |  | (2 | ) |  | 278 |
Corporate debt securities |  | (1 | ) |  | 1,600 |  |  | (28 | ) |  | 4,204 |  |  | (29 | ) |  | 5,804 |
Residential mortgage and asset-backed securities |  | — |  |  | 192 |  |  | (8 | ) |  | 1,186 |  |  | (8 | ) |  | 1,378 |
Total |  | $ | (1 | ) |  | $ | 2,804 |  |  | $ | (52 | ) |  | $ | 7,518 |  |  | $ | (53 | ) |  | $ | 10,322 |

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- Definition Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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