Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from External Customer [Line Items]
Revenue	$ 2,220	$ 2,190
Total products and services
Revenue from External Customer [Line Items]
Revenue	2,191	2,170
Parasiticides
Revenue from External Customer [Line Items]
Revenue	562	504
Vaccines
Revenue from External Customer [Line Items]
Revenue	447	452
Dermatology
Revenue from External Customer [Line Items]
Revenue	390	363
Anti-infectives
Revenue from External Customer [Line Items]
Revenue	249	281
Pain and sedation
Revenue from External Customer [Line Items]
Revenue	210	194
Other pharmaceutical
Revenue from External Customer [Line Items]
Revenue	159	156
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenue	103	82
Other non-pharmaceutical
Revenue from External Customer [Line Items]
Revenue	66	61
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	5	77
Contract manufacturing & human health
Revenue from External Customer [Line Items]
Revenue	$ 29	$ 20