Stockholders' Equity - Changes in Common Shares and Treasury Stock (Details) - USD ($) $ in Billions		3 Months Ended			6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019		Dec. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized		6,000,000,000			6,000,000,000			6,000,000,000
Preferred stock, shares authorized		1,000,000,000			1,000,000,000			1,000,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 1.4			$ 1.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued, shares		501,900,000	501,900,000		501,891,243	501,900,000
Treasury stock, shares					26,363,033	22,300,000	[1]
Treasury stock acquired, shares	[1],[2]					(3,100,000)
Common stock issued, shares		501,891,243	501,900,000		501,891,243	501,900,000
Treasury stock, shares		26,891,765	24,100,000	[1]	26,891,765	24,100,000	[1]
Share Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired, shares	[1],[3]					(1,400,000)
December 2018 Share Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount								$ 2.0

[1] Shares may not add due to rounding.

[2] Reflects the acquisition of treasury shares in connection with the share repurchase program. For additional information see Note 13. Stockholders' Equity.

[3] 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 12. Share-based Payments and Note 13. Stockholders' Equity.