Segment Information Selected Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 2,151	$ 2,002	$ 6,331		$ 6,040
Cost of sales	638	607	1,833		1,801
Other (income)/deductions—net	6	(3)	(151)		6
Income before provision for taxes on income	717	667	2,286	[1]	2,064	[1]
Depreciation and amortization	124	115	365	[1],[2]	346	[1],[2]
Acquisition-related costs	2	0	4		0
Other business activities
Segment Reporting Information [Line Items]
Income before provision for taxes on income	(124)	(106)	(354)		(315)
Depreciation and amortization	9	7	24	[2]	21	[2]
Operating Segments
Segment Reporting Information [Line Items]
Income before provision for taxes on income	1,237	1,165	3,640		3,562
Depreciation and amortization	43	33	125	[2]	102	[2]
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Revenue	1,174	1,090	3,344		3,201
Cost of sales	228	204	645		587
Gross profit	$ 946	$ 886	$ 2,699		$ 2,614
Gross margin, percentage	80.60%	81.30%	80.70%		81.70%
Operating expenses	$ 202	$ 206	$ 602		$ 578
Other (income)/deductions—net	0	1	0		(6)
Income before provision for taxes on income	744	679	2,097		2,042
Depreciation and amortization	19	12	58	[2]	40	[2]
Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	956	889	2,929	[3]	2,780	[3]
Cost of sales	306	256	912		809
Gross profit	$ 650	$ 633	$ 2,017		$ 1,971
Gross margin, percentage	68.00%	71.20%	68.90%		70.90%
Operating expenses	$ 156	$ 150	$ 473		$ 456
Other (income)/deductions—net	1	(3)	1		(5)
Income before provision for taxes on income	493	486	1,543		1,520
Depreciation and amortization	24	21	67	[2]	62	[2]
Corporate
Segment Reporting Information [Line Items]
Income before provision for taxes on income	(258)	(245)	(722)		(771)
Depreciation and amortization	33	33	95	[2]	99	[2]
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	0	0	0	[2]	0	[2]
Purchase accounting adjustments	(39)	(40)	(124)		(120)
Purchase accounting adjustments, Depreciation and Amortization	39	40	118	[2]	120	[2]
Acquisition-related costs	(3)	(1)	(8)		(4)
Certain significant items, Earnings	(23)	(6)	45	[4]	(10)	[4]
Certain significant items, Depreciation and Amortization	0	0	0	[2],[4]	0	[2],[4]
Other unallocated	(73)	(100)	(191)		(278)
Other Unallocated, Depreciation and Amortization	$ 0	$ 2	$ 3	[2]	$ 4	[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 $627 million and $590 million for the nine months ended September 30, 2023 and 2022, 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.For the nine months ended September 30, 2022, primarily represents inventory and asset impairment charges related to the consolidation of manufacturing sites in China as well as employee termination and exit costs associated with cost-reduction and productivity initiatives in certain international markets.