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Share-Based Payments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 12,000,000    
Period following separation service 60 days    
Expected stock price volatility [1] 23.61% 23.26% 26.70%
Accelerated vesting of outstanding stock options $ 0    
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 (in years) 3 years    
Contractual term (in years) 10 years    
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 8    
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year 3 days    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 58    
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year 3 months 12 days    
Granted (in shares) 438,283    
Shares outstanding 556,066    
Deferred Stock Units (DSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 0 0  
Shares outstanding 73,802 73,359  
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 12    
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year 12 days    
Granted (in shares) 109,574    
Shares outstanding 110,158    
Expected stock price volatility 21.90% 23.10%  
PSUs | Peer Companies      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected stock price volatility 25.10% 25.50%  
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] 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.