Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Revenue	$ 2,002	$ 1,990	$ 6,040	$ 5,809
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	23	21	59	57
Vaccines
Revenue from External Customer [Line Items]
Revenue	449	421	1,300	1,251
Parasiticides
Revenue from External Customer [Line Items]
Revenue	422	396	1,417	1,246
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	284	329	802	909
Dermatology
Revenue from External Customer [Line Items]
Revenue	348	326	978	859
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	252	243	771	717
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	78	99	261	314
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	83	95	268	283
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	63	60	184	173
Total products and services
Revenue from External Customer [Line Items]
Revenue	$ 1,979	$ 1,969	$ 5,981	$ 5,752