Share-based Payments (Stock option activity) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding, December 31, 2014 (in shares)		5,541,313
Granted (in shares)		862,403
Exercised (in shares)		(293,355)
Forfeited (in shares)		(162,642)
Outstanding, December 31, 2015 (in shares)		5,947,719	5,541,313
Exercisable, December 31, 2015		369,306
Exercisable, Weighted Average Exercise Price Per Share		$ 31.68
Exercisable, Weighted Average Remaining Contractual Term		1 year 10 months 24 days
Weighted-average Exercise Price Per Share
Outstanding, December 31, 2014 (in dollars per share)		$ 28.56
Granted (in dollars per share)		46.01
Exercised (in dollars per share)		28.99
Forfeited (in dollars per share)		29.68
Outstanding, December 31, 2015 (in dollars per share)		$ 31.03	$ 28.56
Outstanding, Weighted-average Remaining Contractual Term		7 years 6 months
Outstanding, Aggregate Intrinsic Value	[1]	$ 100
Vested and expected to vest, Aggregate Intrinsic Value	[1]	$ 6
Weighted-average grant date fair value per stock option		$ 11.70	$ 8.01
Aggregate intrinsic value on exercise		$ 5	$ 1
Cash received upon exercise		9	2
Tax benefits realized related to exercise		2	1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax		$ 10	$ 17
Weighted-average period over which RSU cost is expected to be recognized (years)		9 months 18 days	1 year 9 months 18 days

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