CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Millions		Total		Common Stock	Treasury Stock		Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Share Repurchase Program	[2]	Share Repurchase Program Treasury Stock	[2]
Common Stock, Shares, Issued		501,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, shares	[1]	22,300,000
Beginning balance at Dec. 31, 2018		$ 2,185		$ 5	$ (1,487)		$ 1,026	$ 3,270	$ (629)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		312						312
Other comprehensive income		31							31
Share-based compensation awards	[2]	$ 17			44		(19)	(8)
Treasury stock acquired, shares	[1]	(1,700,000)	[3]							(1,100,000)
Treasury stock acquired	[3]	$ (150)			(150)	[2]
Employee benefit plan contribution from Pfizer Inc.	[4]	1					1
Dividends declared		(79)						(79)
Ending balance at Mar. 31, 2019		$ 2,317		5	$ (1,593)		1,008	3,495	(598)
Common Stock, Shares, Issued		501,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, shares	[1]	22,900,000
Common Stock, Shares, Issued		501,891,243
Treasury stock, shares		26,363,033			26,400,000	[1]
Beginning balance at Dec. 31, 2019		$ 2,708		5	$ (2,042)		1,044	4,427	(726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		423						423
Other comprehensive income		(55)							(55)
Share-based compensation awards	[2]	21			$ 40		(28)	9
Treasury stock acquired, shares	[1]				(1,800,000)	[3]						(1,200,000)
Treasury stock acquired	[3]	(250)			$ (250)
Employee benefit plan contribution from Pfizer Inc.	[4]	1					1
Dividends declared		(95)						(95)
Ending balance at Mar. 31, 2020		$ 2,753		$ 5	$ (2,252)		$ 1,017	$ 4,764	$ (781)
Common Stock, Shares, Issued		501,891,243
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, shares		27,025,890			27,000,000.0	[1]

[1] Shares may not add due to rounding.

[2] Includes the issuance of shares of Zoetis Inc. common stock and the reacquisition of shares of treasury stock associated with exercises of employee share-based awards. Also includes the reacquisition of shares of treasury stock associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information, see Note 13. Share-based Payments and Note 14. Stockholders' Equity.

[3] Reflects the acquisition of treasury shares in connection with the share repurchase program. For additional information see Note 14. Stockholders' Equity.

[4] Represents contributed capital from Pfizer Inc. associated with service credit continuation for certain Zoetis Inc. employees in Pfizer Inc.'s U.S. qualified defined benefit and U.S. retiree medical plans.