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Share-Based Payments (Narrative) (Details) - USD ($)
12 Months Ended 15 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Aug. 20, 2018
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 11,000,000        
Period following separation service 60 days        
Expected stock price volatility [1] 23.08% 23.61% 23.26%    
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 $ 7,000,000        
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year        
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 $ 43,000,000        
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year 1 month 13 days        
Granted (in shares) 363,447        
Shares outstanding 829,067        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 88.09        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,460,535 1,975,659      
Deferred Stock Units (DSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 0        
Shares outstanding 74,273 73,802      
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax $ 21,000,000        
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year 3 months 18 days        
Granted (in shares) 190,170        
Shares outstanding 159,216        
Expected stock price volatility 20.30% 21.90%      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 101.51        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 419,396 390,841      
PSUs | Peer Companies          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected stock price volatility 25.30% 25.10%      
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%        
Chief Executive Officer [Member] | PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 37,265        
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost $ 2,000,000        
Abaxis Inc [Member] | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   502,766      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 85.26        
Equity Issued in Business Combination, Fair Value Disclosure   $ 33,000,000     $ 10,000,000
Forecast [Member] | Chief Executive Officer [Member] | PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost       $ 8,000,000  
[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.