Identifiable Intangible Assets and Goodwill - Goodwill (Detail) $ in Millions	9 Months Ended
	Sep. 27, 2020 USD ($)
Goodwill [Roll Forward]
Balance, beginning	$ 58,653
Additions	727	[1]
Other	522	[2]
Balance, ending	59,902
Operating Segments [Member] | Biopharma [Member]
Goodwill [Roll Forward]
Balance, beginning	48,202
Additions	727	[1]
Other	420	[2]
Balance, ending	49,349
Operating Segments [Member] | Upjohn [Member]
Goodwill [Roll Forward]
Balance, beginning	10,451
Additions	0	[1]
Other	102	[2]
Balance, ending	$ 10,553

[1] Additions primarily represents the impact of measurement period adjustments related to our Array acquisition (see Note 2A).

[2] Represents the impact of foreign exchange.