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Identifiable Intangible Assets and Goodwill - Goodwill (Detail) $ in Millions | 6 Months Ended
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Jun. 28, 2020 USD ($)
Goodwill [Roll Forward] |  |
Balance, December 31, 2019 | $ 58,653 | [1]
Other | (204) | [2]
Balance, June 28, 2020 | 58,449 | [1]
Operating Segments [Member] | Biopharma [Member] |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2019 | 48,202 |
Other | (155) | [2]
Balance, June 28, 2020 | 48,047 |
Operating Segments [Member] | Upjohn [Member] |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2019 | 10,451 |
Other | (49) | [2]
Balance, June 28, 2020 | $ 10,401 |
[1] | Amounts may not add due to rounding.
[2] | Primarily represents the impact of foreign exchange.

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- Definition Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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