Share-Based Payments (Stock option valuation assumptions) (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Expected dividend yield	[1]	0.75%	0.69%	0.76%
Risk-free interest rate	[2]	2.56%	2.74%	2.29%
Expected stock price volatility	[3]	23.08%	23.61%	23.26%
Expected term (in years)	[4]	5 years 8 months 12 days	6 years 6 months	6 years 6 months

[1] Determined using a constant dividend yield during the expected term of the Zoetis stock option.

[2] Determined using the interpolated yield on U.S. Treasury zero-coupon issues.

[3] etermined using an equal weighting between historical volatility of the Zoetis stock price and implied volatility. The selection of the blended historical and implied volatility approach was based on our assessment that this calculation of expected volatility is more representative of future stock price trends.

[4] Determined using expected exercise and post-vesting termination patterns.