Revenue - Revenue by Major Species (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
Operating Segments | United States Segment
Revenue from External Customer [Line Items]
Revenues		4,555	4,313	4,042
Operating Segments | International Segment
Revenue from External Customer [Line Items]
Revenues	[1]	3,911	3,681	3,652
Livestock
Revenue from External Customer [Line Items]
Revenues		2,890	2,791	3,005
Livestock | United States Segment
Revenue from External Customer [Line Items]
Revenues		1,026	972	1,052
Livestock | International Segment
Revenue from External Customer [Line Items]
Revenues		1,864	1,819	1,953
Companion Animal
Revenue from External Customer [Line Items]
Revenues		5,576	5,203	4,689
Companion Animal | United States Segment
Revenue from External Customer [Line Items]
Revenues		3,529	3,341	2,990
Companion Animal | International Segment
Revenue from External Customer [Line Items]
Revenues		2,047	1,862	1,699
Contract Manufacturing and Human Health Diagnostics [Member]
Revenue from External Customer [Line Items]
Revenues		$ 78	$ 86	$ 82

[1] Revenue denominated in euros was $853 million in 2023, $774 million in 2022 and $814 million in 2021.