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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
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):
| December 31, 2019 |  | December 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | 2,433 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,433 |  |  | $ | 3,969 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,969 |
Certificates of deposit | — |  |  | 3,517 |  |  | — |  |  | 3,517 |  |  | — |  |  | 4,361 |  |  | — |  |  | 4,361 |
U.S. government agencies securities | — |  |  | 1,081 |  |  | — |  |  | 1,081 |  |  | — |  |  | 938 |  |  | — |  |  | 938 |
Non-U.S. government securities | — |  |  | 174 |  |  | — |  |  | 174 |  |  | — |  |  | 305 |  |  | — |  |  | 305 |
Corporate debt securities | — |  |  | 9,204 |  |  | — |  |  | 9,204 |  |  | — |  |  | 13,067 |  |  | — |  |  | 13,067 |
Residential mortgage and asset-backed securities | — |  |  | 91 |  |  | — |  |  | 91 |  |  | — |  |  | 1,524 |  |  | — |  |  | 1,524 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment in Galapagos | 3,477 |  |  | — |  |  | — |  |  | 3,477 |  |  | 622 |  |  | — |  |  | — |  |  | 622 |
Money market funds | 7,069 |  |  | — |  |  | — |  |  | 7,069 |  |  | 5,305 |  |  | — |  |  | — |  |  | 5,305 |
Other publicly traded equity securities | 322 |  |  | — |  |  | — |  |  | 322 |  |  | 259 |  |  | — |  |  | — |  |  | 259 |
Deferred compensation plan | 171 |  |  | — |  |  | — |  |  | 171 |  |  | 124 |  |  | — |  |  | — |  |  | 124 |
Foreign currency derivative contracts | — |  |  | 37 |  |  | — |  |  | 37 |  |  | — |  |  | 78 |  |  | — |  |  | 78 |
Total | $ | 13,472 |  |  | $ | 14,104 |  |  | $ | — |  |  | $ | 27,576 |  |  | $ | 10,279 |  |  | $ | 20,273 |  |  | $ | — |  |  | $ | 30,552 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ | 171 |  |  | $ | — |  |  | $ | — |  |  | $ | 171 |  |  | $ | 124 |  |  | $ | — |  |  | $ | — |  |  | $ | 124 |
Foreign currency derivative contracts | — |  |  | 8 |  |  | — |  |  | 8 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Total | $ | 171 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 179 |  |  | $ | 124 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 125 |
Summary of classification of Galapagos equity investment | The following table summarizes the classification of our equity investment in Galapagos in our Consolidated Balance Sheets (in millions):
| December 31, 2019 |  | December 31, 2018
Prepaid and other current assets | $ | — |  |  | $ | 622 |
Other long-term assets | 3,477 |  |  | — |
Total | $ | 3,477 |  |  | $ | 622 |
Summary of classification of other equity securities | The following table summarizes the classification of our other equity securities in our Consolidated Balance Sheets (in millions):
| December 31, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 7,069 |  |  | $ | 5,305 |
Prepaid and other current assets | 319 |  |  | 241 |
Other long-term assets | 174 |  |  | 142 |
Total | $ | 7,562 |  |  | $ | 5,688 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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