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Available-for-sale securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-for-sale debt and equity securities at estimated fair value | The following summarizes our available-for-sale securities (in millions):
|  | December 31, 2017 |  | December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate debt securities |  | $ | 14,790 |  |  | $ | 3 |  |  | $ | (46 | ) |  | $ | 14,747 |  |  | $ | 12,657 |  |  | $ | 7 |  |  | $ | (61 | ) |  | $ | 12,603 |
Certificates of deposit |  | 5,131 |  |  | — |  |  | — |  |  | 5,131 |  |  | 943 |  |  | — |  |  | — |  |  | 943 |
Money market funds |  | 4,714 |  |  | — |  |  | — |  |  | 4,714 |  |  | 5,464 |  |  | — |  |  | — |  |  | 5,464 |
U.S. treasury securities |  | 4,090 |  |  | — |  |  | (29 | ) |  | 4,061 |  |  | 5,558 |  |  | 1 |  |  | (30 | ) |  | 5,529 |
Residential mortgage and asset-backed securities |  | 4,072 |  |  | 1 |  |  | (15 | ) |  | 4,058 |  |  | 3,613 |  |  | 2 |  |  | (13 | ) |  | 3,602 |
U.S. government agencies securities |  | 934 |  |  | — |  |  | (8 | ) |  | 926 |  |  | 981 |  |  | — |  |  | (6 | ) |  | 975 |
Non-U.S. government securities |  | 668 |  |  | — |  |  | (4 | ) |  | 664 |  |  | 725 |  |  | — |  |  | (5 | ) |  | 720 |
Municipal debt securities |  | — |  |  | — |  |  | — |  |  | — |  |  | 27 |  |  | — |  |  | — |  |  | 27 |
Equity securities |  | 357 |  |  | 278 |  |  | — |  |  | 635 |  |  | 357 |  |  | 71 |  |  | — |  |  | 428 |
Total |  | $ | 34,756 |  |  | $ | 282 |  |  | $ | (102 | ) |  | $ | 34,936 |  |  | $ | 30,325 |  |  | $ | 81 |  |  | $ | (115 | ) |  | $ | 30,291 |
Summary of the classification of available-for-sale debt and equity securities | The following table summarizes the classification of our available-for-sale securities on our Consolidated Balance Sheets (in millions):
| December 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 5,195 |  |  | $ | 5,712 |
Short-term marketable securities | 17,922 |  |  | 3,666 |
Prepaid and other current assets | 635 |  |  | — |
Long-term marketable securities | 11,184 |  |  | 20,485 |
Other long-term assets | — |  |  | 428 |
Total | $ | 34,936 |  |  | $ | 30,291 |
Summary of available-for-sale securities by contractual maturity | The following table summarizes our available-for-sale securities by contractual maturity (in millions):
| December 31, 2017
| Amortized Cost |  | Fair Value
Within one year | $ | 23,139 |  |  | $ | 23,117 |
After one year through five years | 11,125 |  |  | 11,051 |
After five years through ten years | 98 |  |  | 96 |
After ten years | 37 |  |  | 37 |
Total | $ | 34,399 |  |  | $ | 34,301 |
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 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, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | (14 | ) |  | $ | 7,674 |  |  | $ | (32 | ) |  | $ | 3,561 |  |  | $ | (46 | ) |  | $ | 11,235 |
U.S. treasury securities |  | (2 | ) |  | 821 |  |  | (27 | ) |  | 3,240 |  |  | (29 | ) |  | 4,061 |
Residential mortgage and asset-backed securities |  | (4 | ) |  | 2,245 |  |  | (11 | ) |  | 1,206 |  |  | (15 | ) |  | 3,451 |
U.S. government agencies securities |  | (1 | ) |  | 206 |  |  | (7 | ) |  | 700 |  |  | (8 | ) |  | 906 |
Non-U.S. government securities |  | (1 | ) |  | 203 |  |  | (3 | ) |  | 461 |  |  | (4 | ) |  | 664 |
Total |  | $ | (22 | ) |  | $ | 11,149 |  |  | $ | (80 | ) |  | $ | 9,168 |  |  | $ | (102 | ) |  | $ | 20,317 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | (60 | ) |  | $ | 8,685 |  |  | $ | (1 | ) |  | $ | 155 |  |  | $ | (61 | ) |  | $ | 8,840 |
U.S. treasury securities |  | (30 | ) |  | 5,081 |  |  | — |  |  | — |  |  | (30 | ) |  | 5,081 |
Residential mortgage and asset-backed securities |  | (13 | ) |  | 2,180 |  |  | — |  |  | 42 |  |  | (13 | ) |  | 2,222 |
U.S. government agencies securities |  | (6 | ) |  | 897 |  |  | — |  |  | — |  |  | (6 | ) |  | 897 |
Non-U.S. government securities |  | (5 | ) |  | 714 |  |  | — |  |  | 5 |  |  | (5 | ) |  | 719 |
Certificates of deposit |  | — |  |  | 15 |  |  | — |  |  | — |  |  | — |  |  | 15 |
Municipal debt securities |  | — |  |  | 11 |  |  | — |  |  | — |  |  | — |  |  | 11 |
Total |  | $ | (114 | ) |  | $ | 17,583 |  |  | $ | (1 | ) |  | $ | 202 |  |  | $ | (115 | ) |  | $ | 17,785 |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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