Acquisitions and Divestitures - Supplemental Pro Forma Financial Information (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Acquisition-related costs		$ 61
Amortization expense of finite-lived intangible assets		157	$ 100	$ 95
Depreciation expense		152	142	145
Adjustment to inventory	$ 18
Interest expense, net of capitalized interest		206	175	166
Share-based compensation expense		53	44	$ 37
Pro Forma [Member]
Business Acquisition [Line Items]
Acquisition-related costs		82	60
Amortization expense of finite-lived intangible assets		77	130
Depreciation expense		2	3
Adjustment to inventory		18	33
Interest expense, net of capitalized interest		36	57
Abaxis Inc
Business Acquisition [Line Items]
Revenue		5,980	5,542
Net income attributable to Zoetis Inc.		1,402	706
Share-based compensation expense		$ 4	$ 13