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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of fair value, assets and liabilities measured on recurring basis | 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):
| December 31, 2017 |  | December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | $ | — |  |  | $ | 14,747 |  |  | $ | — |  |  | $ | 14,747 |  |  | $ | — |  |  | $ | 12,603 |  |  | $ | — |  |  | $ | 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 | 4,061 |  |  | — |  |  | — |  |  | 4,061 |  |  | 5,529 |  |  | — |  |  | — |  |  | 5,529 |
Residential mortgage and asset-backed securities | — |  |  | 4,058 |  |  | — |  |  | 4,058 |  |  | — |  |  | 3,602 |  |  | — |  |  | 3,602 |
U.S. government agencies securities | — |  |  | 926 |  |  | — |  |  | 926 |  |  | — |  |  | 975 |  |  | — |  |  | 975 |
Non-U.S. government securities | — |  |  | 664 |  |  | — |  |  | 664 |  |  | — |  |  | 720 |  |  | — |  |  | 720 |
Municipal debt securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 27 |  |  | — |  |  | 27 |
Equity securities | 635 |  |  |  |  |  | — |  |  | 635 |  |  | 428 |  |  | — |  |  | — |  |  | 428 |
Deferred compensation plan | 116 |  |  | — |  |  | — |  |  | 116 |  |  | 84 |  |  | — |  |  | — |  |  | 84 |
Foreign currency derivative contracts | — |  |  | 13 |  |  | — |  |  | 13 |  |  | — |  |  | 336 |  |  | — |  |  | 336 |
Total | $ | 9,526 |  |  | $ | 25,539 |  |  | $ | — |  |  | $ | 35,065 |  |  | $ | 11,505 |  |  | $ | 19,206 |  |  | $ | — |  |  | $ | 30,711 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 116 |  |  | $ | — |  |  | $ | — |  |  | $ | 116 |  |  | $ | 84 |  |  | $ | — |  |  | $ | — |  |  | $ | 84 |
Foreign currency derivative contracts | — |  |  | 93 |  |  | — |  |  | 93 |  |  | — |  |  | 37 |  |  | — |  |  | 37 |
Contingent consideration | — |  |  | — |  |  | 15 |  |  | 15 |  |  | — |  |  | — |  |  | 25 |  |  | 25 |
Total | $ | 116 |  |  | $ | 93 |  |  | $ | 15 |  |  | $ | 224 |  |  | $ | 84 |  |  | $ | 37 |  |  | $ | 25 |  |  | $ | 146 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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