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Available-for-Sale Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Securities, Available-for-sale [Abstract] |
Reconciliation of Available-for-Sale Debt Securities from Cost Basis to Fair Value | The following table summarizes our available-for-sale debt securities (in millions):
|  | June 30, 2020 |  |  |  |  |  |  |  | December 31, 2019 |  |  |  |  |  |
|  | 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 |  | $ | 2,479 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 2,498 |  |  | $ | 2,433 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,433 |
Certificates of deposit |  | 2,783 |  |  | — |  |  | — |  |  | 2,783 |  |  | 3,517 |  |  | — |  |  | — |  |  | 3,517 |
U.S. government agencies securities |  | 101 |  |  | — |  |  | — |  |  | 101 |  |  | 1,081 |  |  | — |  |  | — |  |  | 1,081 |
Non-U.S. government securities |  | 145 |  |  | — |  |  | — |  |  | 145 |  |  | 174 |  |  | — |  |  | — |  |  | 174 |
Corporate debt securities |  | 8,755 |  |  | 31 |  |  | (2) |  |  | 8,784 |  |  | 9,203 |  |  | 2 |  |  | (1) |  |  | 9,204 |
Residential mortgage and asset-backed securities |  | 621 |  |  | 3 |  |  | — |  |  | 624 |  |  | 91 |  |  | — |  |  | — |  |  | 91 |
Total |  | $ | 14,884 |  |  | $ | 53 |  |  | $ | (2) |  |  | $ | 14,935 |  |  | $ | 16,499 |  |  | $ | 2 |  |  | $ | (1) |  |  | $ | 16,500 |
Summary of Classification of Available-for-Sale Debt Securities | The following table summarizes the classification of our available-for-sale debt securities in our Condensed Consolidated Balance Sheets (in millions):
|  | June 30, 2020 |  | December 31, 2019
Cash and cash equivalents |  | $ | 491 |  |  | $ | 2,291 |
Short-term marketable securities |  | 12,168 |  |  | 12,721 |
Long-term marketable securities |  | 2,276 |  |  | 1,488 |
Total |  | $ | 14,935 |  |  | $ | 16,500 |
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):
|  | June 30, 2020 |  |
|  | Amortized Cost |  | Fair Value
Within one year |  | $ | 12,623 |  |  | $ | 12,659 |
After one year through five years |  | 2,197 |  |  | 2,212 |
After five years |  | 64 |  |  | 64 |
Total |  | $ | 14,884 |  |  | $ | 14,935 |
Summary of Available-for-Sale Debt Securities in a Continuous Loss Position | The following table summarizes our available-for-sale debt securities in an unrealized loss position (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
June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | (2) |  |  | $ | 1,175 |  |  | $ | — |  |  | $ | — |  |  | $ | (2) |  |  | $ | 1,175 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | (1) |  |  | $ | 1,866 |  |  | $ | — |  |  | $ | 4 |  |  | $ | (1) |  |  | $ | 1,870 |

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
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