Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from External Customer [Line Items]
Revenue	$ 2,388	$ 2,151	$ 6,939	$ 6,331
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	21	21	59	58
Total products and services
Revenue from External Customer [Line Items]
Revenue	2,367	2,130	6,880	6,273
Parasiticides
Revenue from External Customer [Line Items]
Revenue	530	465	1,634	1,465
Vaccines
Revenue from External Customer [Line Items]
Revenue	468	449	1,365	1,308
Dermatology
Revenue from External Customer [Line Items]
Revenue	453	397	1,234	1,048
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	274	264	819	796
Pain and sedation
Revenue from External Customer [Line Items]
Revenue	219	147	634	408
Other pharmaceutical
Revenue from External Customer [Line Items]
Revenue	169	166	478	514
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	101	95	286	284
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	91	86	242	257
Other non-pharmaceutical
Revenue from External Customer [Line Items]
Revenue	$ 62	$ 61	$ 188	$ 193