Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from External Customer [Line Items]
Revenue	$ 2,361	$ 2,180	$ 4,551	$ 4,180
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	18	20	38	37
Vaccines
Revenue from External Customer [Line Items]
Revenue	445	430	897	859
Parasiticides
Revenue from External Customer [Line Items]
Revenue	600	568	1,104	1,000
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	264	244	545	532
Dermatology
Revenue from External Customer [Line Items]
Revenue	418	359	781	651
Other pharmaceutical
Revenue from External Customer [Line Items]
Revenue	153	170	309	348
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	74	84	151	171
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	103	96	185	189
Other non-pharmaceutical
Revenue from External Customer [Line Items]
Revenue	65	64	126	132
Total products and services
Revenue from External Customer [Line Items]
Revenue	2,343	2,160	4,513	4,143
Pain & Sedation
Revenue from External Customer [Line Items]
Revenue	$ 221	$ 145	$ 415	$ 261