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Financial Instruments - Investments - Unrealized Gains and Losses Related to Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Financial Instruments [Abstract] |  |  |  |  |
Net gains recognized during the period on investments in equity securities | [1],[2] | $ (732) | $ (36) | $ (478) | $ (147)
Less: Net (gains)/losses recognized during the period on equity securities sold during the period |  | 1 | (6) | (18) | (10)
Net unrealized gains during the reporting period on equity securities still held at the reporting date | [3] | $ (733) | $ (31) | $ (459) | $ (137)
[1] | The gains in the second quarter of 2020 include, among other things, unrealized gains of $508 million related to our investment in Allogene and unrealized gains of $61 million related to our investment in BioNTech. The gains in the first six months of 2020 include, among other things, unrealized gains of $374 million related to our investment in Allogene and unrealized gains of $127 million related to our investment in BioNTech. The gains in the first six months of 2019 included, among other things, unrealized gains of $104 million related to our investment in Cortexyme, Inc. For additional information on investments, see Note 7B.
[2] | The net gains on investments in equity securities are reported in Other (income)/deductions––net. For additional information, see Note 4.
[3] | Included in net unrealized gains are observable price changes on equity securities without readily determinable fair values. Since January 1, 2018, there were cumulative impairments and downward adjustments of $67 million and upward adjustments of $66 million. Impairments, downward and upward adjustments were not significant in the second quarter and the first six months of 2020 and 2019.

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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