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Share-Based Payments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of stock approved and registered with the SEC 25,000,000    
Shares available for future grant 14,000,000    
Length of time to exercise stock options after termination 3 months    
Period following separation service 60 days    
Expected stock price volatility [1] 26.70% 23.92% 24.72%
Accelerated vesting of outstanding stock options $ 1 $ 2  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price percentage of the fair market value price at date of grant 100.00%    
Award vesting period 3 years    
Contractual term 10 years    
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 7    
Weighted-average period over which RSU cost is expected to be recognized (years) 7 months 6 days    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 33    
Weighted-average period over which RSU cost is expected to be recognized (years) 1 year 2 months 12 days    
Granted (in shares) 738,643    
Shares outstanding 747,412    
Deferred Stock Units (DSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 0    
Shares outstanding 72,838 72,246  
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 9    
Weighted-average period over which RSU cost is expected to be recognized (years) 1 year 9 months 12 days    
Granted (in shares) 198,445    
Shares outstanding 11,861    
Expected stock price volatility 23.80% 21.80%  
PSUs | Peer Companies      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected stock price volatility 25.20% 23.50%  
PSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target units 0.00%    
PSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target units 200.00%    
[1] For 2016 and 2015, determined 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. For 2014, determined using implied volatility.