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Available-for-Sale Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Securities, Available-for-sale [Abstract] |
Summary of Available-for-Sale Securities at Estimated Fair Value | The following table summarizes our available-for-sale debt securities (in millions):
|  | September 30, 2018 |  | December 31, 2017
|  | 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 |  | $ | 3,090 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 3,075 |  |  | $ | 4,090 |  |  | $ | — |  |  | $ | (29 | ) |  | $ | 4,061 |
Certificates of deposit |  | 4,392 |  |  | — |  |  | — |  |  | 4,392 |  |  | 5,131 |  |  | — |  |  | — |  |  | 5,131 |
U.S. government agencies securities |  | 938 |  |  | — |  |  | (6 | ) |  | 932 |  |  | 934 |  |  | — |  |  | (8 | ) |  | 926 |
Non-U.S. government securities |  | 262 |  |  | — |  |  | (2 | ) |  | 260 |  |  | 668 |  |  | — |  |  | (4 | ) |  | 664 |
Corporate debt securities |  | 12,792 |  |  | 2 |  |  | (37 | ) |  | 12,757 |  |  | 14,790 |  |  | 3 |  |  | (46 | ) |  | 14,747 |
Residential mortgage and asset-backed securities |  | 2,049 |  |  | — |  |  | (12 | ) |  | 2,037 |  |  | 4,072 |  |  | 1 |  |  | (15 | ) |  | 4,058 |
Total |  | $ | 23,523 |  |  | $ | 2 |  |  | $ | (72 | ) |  | $ | 23,453 |  |  | $ | 29,685 |  |  | $ | 4 |  |  | $ | (102 | ) |  | $ | 29,587 |
Summary of the Classification of Available-for-Sale Securities | The following table summarizes the classification of our available-for-sale debt securities in our Condensed Consolidated Balance Sheets (in millions):
|  | September 30, 2018 |  | December 31, 2017
Cash and cash equivalents |  | $ | 7,178 |  |  | $ | 481 |
Short-term marketable securities |  | 13,897 |  |  | 17,922 |
Long-term marketable securities |  | 2,378 |  |  | 11,184 |
Total |  | $ | 23,453 |  |  | $ | 29,587 |
Summary of Available-for-Sale Securities by Contractual Maturity | The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
|  | September 30, 2018
|  | Amortized Cost |  | Fair Value
Within one year |  | $ | 21,130 |  |  | $ | 21,075 |
After one year through five years |  | 2,313 |  |  | 2,299 |
After five years through ten years |  | 58 |  |  | 57 |
After ten years |  | 22 |  |  | 22 |
Total |  | $ | 23,523 |  |  | $ | 23,453 |
Summary of Available-for-Sale 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, 2018 |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | (1 | ) |  | $ | 1,339 |  |  | $ | (14 | ) |  | $ | 1,613 |  |  | $ | (15 | ) |  | $ | 2,952 |
U.S. government agencies securities |  | — |  |  | 285 |  |  | (6 | ) |  | 612 |  |  | (6 | ) |  | 897 |
Non-U.S. government securities |  | — |  |  | — |  |  | (2 | ) |  | 234 |  |  | (2 | ) |  | 234 |
Corporate debt securities |  | (6 | ) |  | 2,636 |  |  | (31 | ) |  | 3,602 |  |  | (37 | ) |  | 6,238 |
Residential mortgage and asset-backed securities |  | (1 | ) |  | 409 |  |  | (11 | ) |  | 1,300 |  |  | (12 | ) |  | 1,709 |
Total |  | $ | (8 | ) |  | $ | 4,669 |  |  | $ | (64 | ) |  | $ | 7,361 |  |  | $ | (72 | ) |  | $ | 12,030 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | (2 | ) |  | $ | 821 |  |  | $ | (27 | ) |  | $ | 3,240 |  |  | $ | (29 | ) |  | $ | 4,061 |
U.S. government agencies securities |  | (1 | ) |  | 206 |  |  | (7 | ) |  | 700 |  |  | (8 | ) |  | 906 |
Non-U.S. government securities |  | (1 | ) |  | 203 |  |  | (3 | ) |  | 461 |  |  | (4 | ) |  | 664 |
Corporate debt securities |  | (14 | ) |  | 7,674 |  |  | (32 | ) |  | 3,561 |  |  | (46 | ) |  | 11,235 |
Residential mortgage and asset-backed securities |  | (4 | ) |  | 2,245 |  |  | (11 | ) |  | 1,206 |  |  | (15 | ) |  | 3,451 |
Total |  | $ | (22 | ) |  | $ | 11,149 |  |  | $ | (80 | ) |  | $ | 9,168 |  |  | $ | (102 | ) |  | $ | 20,317 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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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=82897076&loc=d3e27290-111563 + Details
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