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Available-for-Sale Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
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):
|  | September 30, 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 |  | $ | 2,860 |  |  | $ | 1 |  |  | $ | (1 | ) |  | $ | 2,860 |  |  | $ | 3,978 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 3,969 |
Certificates of deposit |  | 4,152 |  |  | — |  |  | — |  |  | 4,152 |  |  | 4,361 |  |  | — |  |  | — |  |  | 4,361 |
U.S. government agencies securities |  | 1,145 |  |  | — |  |  | — |  |  | 1,145 |  |  | 943 |  |  | — |  |  | (5 | ) |  | 938 |
Non-U.S. government securities |  | 192 |  |  | — |  |  | — |  |  | 192 |  |  | 307 |  |  | — |  |  | (2 | ) |  | 305 |
Corporate debt securities |  | 10,472 |  |  | 3 |  |  | (1 | ) |  | 10,474 |  |  | 13,095 |  |  | 1 |  |  | (29 | ) |  | 13,067 |
Residential mortgage and asset-backed securities |  | 231 |  |  | — |  |  | (1 | ) |  | 230 |  |  | 1,532 |  |  | — |  |  | (8 | ) |  | 1,524 |
Total |  | $ | 19,052 |  |  | $ | 4 |  |  | $ | (3 | ) |  | $ | 19,053 |  |  | $ | 24,216 |  |  | $ | 1 |  |  | $ | (53 | ) |  | $ | 24,164 |
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):
|  | September 30, 2019 |  | December 31, 2018
Cash and cash equivalents |  | $ | 3,476 |  |  | $ | 10,592 |
Short-term marketable securities |  | 13,382 |  |  | 12,149 |
Long-term marketable securities |  | 2,195 |  |  | 1,423 |
Total |  | $ | 19,053 |  |  | $ | 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):
|  | September 30, 2019
|  | Amortized Cost |  | Fair Value
Within one year |  | $ | 16,858 |  |  | $ | 16,859 |
After one year through five years |  | 2,166 |  |  | 2,166 |
After five years through ten years |  | 14 |  |  | 14 |
After ten years |  | 14 |  |  | 14 |
Total |  | $ | 19,052 |  |  | $ | 19,053 |
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
September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | (1 | ) |  | $ | 1,339 |  |  | $ | — |  |  | $ | 96 |  |  | $ | (1 | ) |  | $ | 1,435 |
U.S. government agencies securities |  | — |  |  | 902 |  |  | — |  |  | 30 |  |  | — |  |  | 932 |
Non-U.S. government securities |  | — |  |  | 25 |  |  | — |  |  | — |  |  | — |  |  | 25 |
Corporate debt securities |  | (1 | ) |  | 1,541 |  |  | — |  |  | 297 |  |  | (1 | ) |  | 1,838 |
Residential mortgage and asset-backed securities |  | — |  |  | 10 |  |  | (1 | ) |  | 171 |  |  | (1 | ) |  | 181 |
Total |  | $ | (2 | ) |  | $ | 3,817 |  |  | $ | (1 | ) |  | $ | 594 |  |  | $ | (3 | ) |  | $ | 4,411 |
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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