Identifiable Intangible Assets and Goodwill - Goodwill (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Balance, December 31, 2018	$ 53,411	[1]
Other	(59)	[2]
Balance, June 30, 2019	53,352	[1]
Operating Segments [Member] | Biopharma [Member]
Goodwill [Roll Forward]
Balance, December 31, 2018	42,927
Other	(47)	[2]
Balance, June 30, 2019	42,880
Operating Segments [Member] | Upjohn [Member]
Goodwill [Roll Forward]
Balance, December 31, 2018	10,484
Other	(12)	[2]
Balance, June 30, 2019	$ 10,472

[1] Amounts may not add due to rounding.

[2] Primarily reflects the impact of foreign exchange.