Revenue - Revenue by Species (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
Dogs and Cats
Revenue from External Customer [Line Items]
Revenue	1,153	1,199
Horses
Revenue from External Customer [Line Items]
Revenue	72	64
Cattle
Revenue from External Customer [Line Items]
Revenue	399	364
Swine
Revenue from External Customer [Line Items]
Revenue	142	154
Poultry
Revenue from External Customer [Line Items]
Revenue	139	124
Fish
Revenue from External Customer [Line Items]
Revenue	49	44
Sheep and other
Revenue from External Customer [Line Items]
Revenue	29	19
Livestock
Revenue from External Customer [Line Items]
Revenue	758	705
Companion animal
Revenue from External Customer [Line Items]
Revenue	1,225	1,263
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	$ 294	$ 254