Segment Information - Income Statement (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues		$ 1,674	$ 1,584	$ 1,547	$ 1,455	$ 1,564	$ 1,480	$ 1,415	$ 1,366	$ 6,260		$ 5,825		$ 5,307
Cost of Sales	[1]									1,992		1,911		1,775
Other (income)/deductions										(57)		(83)		6
Earnings		437	$ 528	$ 455	$ 381	418	$ 418	$ 437	$ 417	1,801	[2]	1,690	[2]	1,525	[2]
Depreciation and Amortization	[2],[3]									412		308		242
Acquisition-related costs, earnings										43
Property, plant and equipment, less accumulated depreciation		1,940				1,658				1,940		1,658
United States
Segment Reporting Information [Line Items]
Property, plant and equipment, less accumulated depreciation		1,342				1,188				1,342		1,188
International Segment
Segment Reporting Information [Line Items]
Property, plant and equipment, less accumulated depreciation		$ 598				$ 470				598		470
Other business activities
Segment Reporting Information [Line Items]
Earnings										(348)		(337)		(313)
Depreciation and Amortization	[3]									24		23		23
Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	[3]									69
Acquisition-related costs
Segment Reporting Information [Line Items]
Depreciation and Amortization	[3]									0		0		0
United States
Segment Reporting Information [Line Items]
Revenues										3,203		2,877		2,620
Operating Segments
Segment Reporting Information [Line Items]
Earnings										3,492		3,214		2,877
Depreciation and Amortization	[3]									97		82		73
Operating Segments | United States Segment
Segment Reporting Information [Line Items]
Revenues										3,203		2,877		2,620
Cost of Sales										655		606		565
Gross Profit										$ 2,548		$ 2,271		$ 2,055
Gross Margin										79.60%		78.90%		78.40%
Operating Expenses										$ 543		$ 456		$ 421
Other (income)/deductions										0		0		3
Earnings										2,005		1,815		1,637
Depreciation and Amortization	[3]									44		34		29
Operating Segments | International Segment
Segment Reporting Information [Line Items]
Revenues	[4]									2,972		2,890		2,643
Cost of Sales										925		929		889
Gross Profit										$ 2,047		$ 1,961		$ 1,754
Gross Margin										68.90%		67.90%		66.40%
Operating Expenses										$ 560		$ 559		$ 515
Other (income)/deductions										0		(3)		1
Earnings										1,487		1,399		1,240
Operating Segments | International
Segment Reporting Information [Line Items]
Depreciation and Amortization	[3]									53		48		44
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Earnings										(707)		(666)		(625)
Depreciation and Amortization	[3]											59		52
Segment Reconciling Items
Segment Reporting Information [Line Items]
Purchase accounting adjustments, earnings										(234)		(162)		(88)
Purchase accounting adjustments, depreciation and amortization	[3]									219		143		88
Acquisition-related costs, earnings										(43)		(63)		(10)
Certain significant items, earnings	[5]									(67)		43		(25)
Certain significant items, depreciation and amortization	[3],[5]									0		0		0
Other unallocated, earnings										(292)		(339)		(291)
Other unallocated, deprecation and amortization	[3]									$ 3		$ 1		$ 6

[1] Exclusive of amortization of intangible assets, except as disclosed in Note 3. Significant Accounting Policies—Amortization of Intangible Assets, Depreciation and Certain Long-Lived Assets.

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

[3] 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.

[4] Revenue denominated in euros was $742 million in 2019, $745 million in 2018, and $660 million in 2017.

[5] For 2019, certain significant items primarily includes: (i) a change in estimate related to inventory costing of $69 million, (ii) CEO transition-related costs of $10 million, (iii) consulting fees, product transfer costs, employee termination costs and exit costs related to cost-reduction and productivity initiatives of $7 million, and (iv) income of $20 million resulting from a payment received pursuant to an agreement related to the 2016 sale of certain U.S. manufacturing sites. For 2018, certain significant items primarily includes: (i) a net gain of $42 million related to the divestiture of certain agribusiness products within our International segment, (ii) a net gain of $18 million related to the relocation of a manufacturing site in China, (iii) charges related to our operational efficiency initiative and supply network strategy initiative of $9 million; and (iv) employee termination costs in Europe of $7 million. For 2017, certain significant items primarily includes: (i) charges related to our operational efficiency initiative and supply network strategy initiative of $20 million; (ii) Zoetis stand-up costs of $3 million; (iii) employee termination costs in Europe of $4 million, (iv) income related to a commercial settlement in Mexico recorded in 2014 and 2016 of $5 million; and (iv) charges of $3 million associated with changes to our operating model.