Segment Information Selected Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 2,388	$ 2,151	$ 6,939		$ 6,331
Cost of sales	701	638	2,012		1,833
Other (income)/deductions—net	(16)	6	1		(151)
Income before provision for taxes on income	874	717	2,401	[1]	2,286	[1]
Depreciation and amortization	121	124	374	[1],[2]	365	[1],[2]
Other business activities
Segment Reporting Information [Line Items]
Income before provision for taxes on income	(137)	(124)	(411)		(354)
Depreciation and amortization	9	9	29	[2]	24	[2]
Operating Segments
Segment Reporting Information [Line Items]
Income before provision for taxes on income	1,431	1,237	4,112		3,640
Depreciation and amortization	45	43	138	[2]	125	[2]
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Revenue	1,346	1,174	3,817		3,344
Cost of sales	258	228	707		645
Gross profit	$ 1,088	$ 946	$ 3,110		$ 2,699
Gross margin, percentage	80.80%	80.60%	81.50%		80.70%
Operating expenses	$ 199	$ 202	$ 593		$ 602
Other (income)/deductions—net	0	0	0		0
Income before provision for taxes on income	889	744	2,517		2,097
Depreciation and amortization	20	19	65	[2]	58	[2]
Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	1,021	956	3,063	[3]	2,929	[3]
Cost of sales	321	306	976		912
Gross profit	$ 700	$ 650	$ 2,087		$ 2,017
Gross margin, percentage	68.60%	68.00%	68.10%		68.90%
Operating expenses	$ 157	$ 156	$ 491		$ 473
Other (income)/deductions—net	1	1	1		1
Income before provision for taxes on income	542	493	1,595		1,543
Depreciation and amortization	25	24	73	[2]	67	[2]
Corporate
Segment Reporting Information [Line Items]
Income before provision for taxes on income	(306)	(258)	(893)		(722)
Depreciation and amortization	31	33	96	[2]	95	[2]
Reconciling Items
Segment Reporting Information [Line Items]
Purchase accounting adjustments	(35)	(39)	(107)		(124)
Purchase accounting adjustments, Depreciation and Amortization	35	39	107	[2]	118	[2]
Acquisition and divestiture-related costs	(7)	(3)	(12)		(8)
Acquisition and divestiture-related costs, Depreciation and Amortization	0	0	0	[2]	0	[2]
Certain significant items, Earnings	(1)	(23)	(77)	[4]	45	[4]
Certain significant items, Depreciation and Amortization	0	0	0	[2],[4]	0	[2],[4]
Other unallocated	(71)	(73)	(211)		(191)
Other unallocated, Depreciation and Amortization	$ 1	$ 0	$ 4	[2]	$ 3	[2]

[1] Defined as income before provision for taxes on income.

[2] Certain production facilities are shared. Depreciation and amortization is allocated to the reportable operating segments based on estimates of where the benefits of the related assets are realized.

[3] Revenue denominated in euros was $694 million and $627 million for the nine months ended September 30, 2024 and 2023, respectively.

[4] For the nine months ended September 30, 2023, primarily consisted of a gain on the sale of a majority interest in our pet insurance business, partially offset by employee termination costs related to organizational structure refinements and certain asset impairment charges related to our precision animal health and diagnostics businesses.