Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from External Customer [Line Items]
Revenue	$ 2,180	$ 2,052	$ 4,180	$ 4,038
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	20	18	37	36
Vaccines
Revenue from External Customer [Line Items]
Revenue	430	446	859	851
Parasiticides
Revenue from External Customer [Line Items]
Revenue	568	536	1,000	995
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	244	233	532	518
Dermatology
Revenue from External Customer [Line Items]
Revenue	359	319	651	630
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	315	265	609	519
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	84	85	171	183
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	96	87	189	185
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	64	63	132	121
Total products and services
Revenue from External Customer [Line Items]
Revenue	$ 2,160	$ 2,034	$ 4,143	$ 4,002