Revenue - Revenue by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Revenues	$ 9,256	$ 8,544	$ 8,080
Vaccines
Revenue from External Customer [Line Items]
Revenues	1,827	1,771	1,718
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenues	658	678	623
Dermatology [Member]
Revenue from External Customer [Line Items]
Revenues	1,655	1,427	1,329
Anti-infectives
Revenue from External Customer [Line Items]
Revenues	1,100	1,057	1,081
Parasiticides
Revenue from External Customer [Line Items]
Revenues	2,153	1,947	1,860
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenues	253	254	250
Medicated feed additives
Revenue from External Customer [Line Items]
Revenues	293	354	360
Animal health diagnostics
Revenue from External Customer [Line Items]
Revenues	386	376	353
Total Products and Services
Revenue from External Customer [Line Items]
Revenues	9,176	8,466	7,994
Contract Manufacturing and Human Health Diagnostics [Member]
Revenue from External Customer [Line Items]
Revenues	80	78	86
Pain & Sedation
Revenue from External Customer [Line Items]
Revenues	$ 851	$ 602	$ 420