Acquisitions and Divestitures (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended		3 Months Ended			12 Months Ended
		Jul. 31, 2018	Nov. 14, 2017	May 11, 2017	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2019	Jun. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Business Acquisition [Line Items]
Business acquisition, name of acquired entity									Abaxis, Inc. (Abaxis), a California corporation and a leader in the development, manufacture and marketing of diagnostic instruments for veterinary point-of-care services
Proceeds from Sale of Property, Plant, and Equipment										$ 21	$ 56		$ 37
Gain (Loss) on Disposition of Assets										$ 20	40	[1]	$ (11)	[1]
Abaxis Inc
Business Acquisition [Line Items]
Share price of acquisition (in dollars per share)		$ 83.00
Cash and cash equivalents		$ 64
Short term investments		107
Accounts receivable		30
Inventories		79
Other current assets		6
Property, plant and equipment		54
Identifiable intangible assets		894
Other noncurrent assets		29
Accounts payable		(21)
Accrued compensation and related items		(10)
Other current liabilities		(22)
Other noncurrent liabilities		(11)
Noncurrent deferred tax liabilities		(214)
Total net assets acquired		985
Goodwill		977
Total consideration		1,962
Cash paid to shareholders		1,898
Agribusiness Products
Business Acquisition [Line Items]
Amount to be received under agreement	[2]				$ 47
Gain (Loss) on Disposition of Assets	[2]						$ 42				$ 42
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Guarulhos, Brazil
Business Acquisition [Line Items]
Amount to be received under agreement			$ 41			$ 8
Gain (loss) on disposal			$ (9)						$ 5
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Shenzhou, China
Business Acquisition [Line Items]
Amount to be received under agreement				$ 3
Gain (loss) on disposal				$ 2
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Laurinburg, North Carolina and Longmont, Colorado Manufacturing Sites | United States
Business Acquisition [Line Items]
Gain (loss) on disposal								$ 4
Variable Interest Entity, Primary Beneficiary | Jilin Pfizer Guoyuan Animal Health Co Ltd
Business Acquisition [Line Items]
Ownership share (percentage)							55.00%			55.00%
Measurement period adjustment [Member] | Abaxis Inc
Business Acquisition [Line Items]
Property, plant and equipment		5
Identifiable intangible assets		3						$ 1
Other current liabilities		(4)
Goodwill		$ 6

[1] For 2018, represents a gain on the divestiture of certain agribusiness products within our International segment, and a net loss related to sales of certain manufacturing sites and products as part of our supply network strategy initiative. For 2017, primarily represents a net loss related to sales of certain manufacturing sites and products, including our manufacturing site in Guarulhos, Brazil, as part of our operational efficiency initiative and supply network strategy.

[2] Includes adjustments for foreign currency translation. For 2018, also includes $2 million related to the divestiture of certain agribusiness products within our International segment.