Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer [Line Items]
Revenue	$ 2,000	$ 1,986
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	17	18
Vaccines
Revenue from External Customer [Line Items]
Revenue	429	405
Parasiticides
Revenue from External Customer [Line Items]
Revenue	432	459
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	288	285
Dermatology
Revenue from External Customer [Line Items]
Revenue	292	311
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	294	254
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	87	98
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	93	98
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	68	58
Total products and services
Revenue from External Customer [Line Items]
Revenue	$ 1,983	$ 1,968