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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Summary of assets and liabilities measured at fair value | The following table summarizes the types of assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in millions):
| June 30, 2018 |  | December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | $ | — |  |  | $ | 12,092 |  |  | $ | — |  |  | $ | 12,092 |  |  | $ | — |  |  | $ | 14,747 |  |  | $ | — |  |  | $ | 14,747 |
U.S. treasury securities | 3,391 |  |  | — |  |  | — |  |  | 3,391 |  |  | 4,061 |  |  | — |  |  | — |  |  | 4,061 |
Residential mortgage and asset-backed securities | — |  |  | 2,657 |  |  | — |  |  | 2,657 |  |  | — |  |  | 4,058 |  |  | — |  |  | 4,058 |
U.S. government agencies securities | — |  |  | 872 |  |  | — |  |  | 872 |  |  | — |  |  | 926 |  |  | — |  |  | 926 |
Certificates of deposit | — |  |  | 3,145 |  |  | — |  |  | 3,145 |  |  | — |  |  | 5,131 |  |  | — |  |  | 5,131 |
Non-U.S. government securities | — |  |  | 404 |  |  | — |  |  | 404 |  |  | — |  |  | 664 |  |  | — |  |  | 664 |
Marketable equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 7,060 |  |  | — |  |  | — |  |  | 7,060 |  |  | 4,714 |  |  | — |  |  | — |  |  | 4,714 |
Equity securities | 663 |  |  | — |  |  | — |  |  | 663 |  |  | 635 |  |  | — |  |  | — |  |  | 635 |
Deferred compensation plan | 131 |  |  | — |  |  | — |  |  | 131 |  |  | 116 |  |  | — |  |  | — |  |  | 116 |
Foreign currency derivative contracts | — |  |  | 53 |  |  | — |  |  | 53 |  |  | — |  |  | 13 |  |  | — |  |  | 13 |
Total | $ | 11,245 |  |  | $ | 19,223 |  |  | $ | — |  |  | $ | 30,468 |  |  | $ | 9,526 |  |  | $ | 25,539 |  |  | $ | — |  |  | $ | 35,065 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 131 |  |  | $ | — |  |  | $ | — |  |  | $ | 131 |  |  | $ | 116 |  |  | $ | — |  |  | $ | — |  |  | $ | 116 |
Foreign currency derivative contracts | — |  |  | 11 |  |  | — |  |  | 11 |  |  | — |  |  | 93 |  |  | — |  |  | 93 |
Total | $ | 131 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 142 |  |  | $ | 116 |  |  | $ | 93 |  |  | $ | — |  |  | $ | 209 |
Summary of the Classification of Marketable Equity Securities | The following table summarizes the classification of our marketable equity securities in our Condensed Consolidated Balance Sheets (in millions):
| June 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 7,060 |  |  | $ | 4,714 |
Prepaid and other current assets | 666 |  |  | 637 |
Other long-term assets | 128 |  |  | 114 |
Total | $ | 7,854 |  |  | $ | 5,465 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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