Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

(MILLIONS OF DOLLARS, EXCEPT PER COMMON SHARE DATA)	FIRST			SECOND			THIRD			FOURTH
2018
Revenue	$	1,366		$	1,415		$	1,480		$	1,564
Costs and expenses(a)	947			973			1,015			1,132
Restructuring charges and certain acquisition-related costs	2			5			47			14
Income before provision for taxes on income	417			437			418			418
Provision for taxes on income	67			55			71			73
Net income before allocation to noncontrolling interests	350			382			347			345
Net loss attributable to noncontrolling interests	(2		)	(2		)	—			—
Net income attributable to Zoetis	$	352		$	384		$	347		$	345
Earnings per common share--basic	$	0.72		$	0.79		$	0.72		$	0.72
Earnings per common share--diluted	$	0.72		$	0.79		$	0.71		$	0.71
2017
Revenue	$	1,231		$	1,269		$	1,347		$	1,460
Costs and expenses(a)	895			924			926			1,018
Restructuring (reversals)/charges and certain acquisition-related costs	(1		)	—			8			12
Income before provision for taxes on income	337			345			413			430
Provision for taxes on income(b)	98			98			117			350
Net income before allocation to noncontrolling interests	239			247			296			80
Net income/(loss) attributable to noncontrolling interests	1			—			(2		)	(1		)
Net income attributable to Zoetis	$	238		$	247		$	298		$	81
Earnings per common share--basic	$	0.48		$	0.50		$	0.61		$	0.17
Earnings per common share--diluted	$	0.48		$	0.50		$	0.61		$	0.16

^(a)  Costs and expenses in the fourth quarter reflect seasonal trends.

^(b)  For the fourth quarter of 2017, includes a provisional net tax charge related to the impact of the Tax Act enacted on December 22, 2017. See Note 8. Tax Matters.