Revenue - Revenue by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Revenues	$ 7,776	$ 6,675	$ 6,260
Vaccines
Revenue from External Customer [Line Items]
Revenues	1,673	1,476	1,483
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenues	966	821	780
Dermatology [Member]
Revenue from External Customer [Line Items]
Revenues	1,180	941	770
Anti-infectives
Revenue from External Customer [Line Items]
Revenues	1,215	1,206	1,254
Parasiticides
Revenue from External Customer [Line Items]
Revenues	1,635	1,173	966
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenues	231	210	184
Medicated feed additives
Revenue from External Customer [Line Items]
Revenues	420	460	470
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenues	374	305	268
Total Products and Services
Revenue from External Customer [Line Items]
Revenues	7,694	6,592	6,175
Contract Manufacturing and Human Health Diagnostics [Member]
Revenue from External Customer [Line Items]
Revenues	$ 82	$ 83	$ 85