Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Revenue	$ 2,190	$ 2,000
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	20	17
Vaccines
Revenue from External Customer [Line Items]
Revenue	452	429
Parasiticides
Revenue from External Customer [Line Items]
Revenue	504	432
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	281	288
Dermatology
Revenue from External Customer [Line Items]
Revenue	363	292
Other pharmaceutical
Revenue from External Customer [Line Items]
Revenue	156	178
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	77	87
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	82	93
Other non-pharmaceutical
Revenue from External Customer [Line Items]
Revenue	61	68
Total products and services
Revenue from External Customer [Line Items]
Revenue	2,170	1,983
Pain & Sedation
Revenue from External Customer [Line Items]
Revenue	$ 194	$ 116