Share-Based Payments (Stock option activity) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding, Beginning Balance (in shares)		5,947,719
Granted (in shares)		952,729
Exercised (in shares)		(1,262,751)
Forfeited (in shares)		(266,913)
Outstanding, Ending Balance (in shares)		5,370,784	5,947,719
Weighted-average Exercise Price Per Share
Outstanding, Beginning Balance (in dollars per share)		$ 31.03
Granted (in dollars per share)		42.51
Exercised (in dollars per share)		28.54
Forfeited (in dollars per share)		39.41
Outstanding, Ending Balance (in dollars per share)		$ 33.23	$ 31.03
Outstanding, Weighted-average Remaining Contractual Term		7 years 2 months
Outstanding, Aggregate Intrinsic Value	[1]	$ 109
Exercisable, December 31, 2016		1,672,115
Exercisable, Weighted Average Exercise Price Per Share		$ 26.51
Exercisable, Weighted Average Remaining Contractual Term		5 years 10 months 24 days
Vested and expected to vest, Aggregate Intrinsic Value	[1]	$ 45
Weighted-average grant date fair value per stock option		$ 11.34	$ 11.70	$ 8.01
Aggregate intrinsic value on exercise		$ 23	$ 5	$ 1
Cash received upon exercise		36	9	2
Tax benefits realized related to exercise		$ 15	$ 2	$ 1

[1] Market price of underlying Zoetis common stock less exercise price.