Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Revenue	$ 2,151	$ 2,002	$ 6,331	$ 6,040
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	21	23	58	59
Vaccines
Revenue from External Customer [Line Items]
Revenue	449	449	1,308	1,300
Parasiticides
Revenue from External Customer [Line Items]
Revenue	465	422	1,465	1,417
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	264	284	796	802
Dermatology
Revenue from External Customer [Line Items]
Revenue	397	348	1,048	978
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	313	252	922	771
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	86	78	257	261
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	95	83	284	268
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	61	63	193	184
Total products and services
Revenue from External Customer [Line Items]
Revenue	$ 2,130	$ 1,979	$ 6,273	$ 5,981