Revenue - Revenue by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Revenues	$ 8,544	$ 8,080	$ 7,776
Vaccines
Revenue from External Customer [Line Items]
Revenues	1,771	1,718	1,673
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenues	1,280	1,043	966
Dermatology [Member]
Revenue from External Customer [Line Items]
Revenues	1,427	1,329	1,180
Anti-infectives
Revenue from External Customer [Line Items]
Revenues	1,057	1,081	1,215
Parasiticides
Revenue from External Customer [Line Items]
Revenues	1,947	1,860	1,635
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenues	254	250	231
Medicated feed additives
Revenue from External Customer [Line Items]
Revenues	354	360	420
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenues	376	353	374
Total Products and Services
Revenue from External Customer [Line Items]
Revenues	8,466	7,994	7,694
Contract Manufacturing and Human Health Diagnostics [Member]
Revenue from External Customer [Line Items]
Revenues	$ 78	$ 86	$ 82