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Share-Based Payments (Narrative) (Details) - USD ($)
12 Months Ended 15 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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     25,000,000  
Shares available for future grant 11,000,000     11,000,000  
Period following separation service 60 days        
Expected stock price volatility [1] 24.33% 23.08% 23.61%    
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 $ 8,000,000     $ 8,000,000  
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 $ 39,000,000     $ 39,000,000  
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year        
Granted (in shares) 239,745        
Shares outstanding 627,818        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 144.06        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 983,466 1,460,535   983,466  
Deferred Stock Units (DSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 0        
Shares outstanding 74,688 74,273      
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 $ 18,000,000     $ 18,000,000  
Weighted-average period over which RSU cost is expected to be recognized (in years) 1 year 1 month 6 days        
Granted (in shares) 85,279        
Shares outstanding 141,594        
Expected stock price volatility 20.20% 20.30%      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 217.49        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 344,271 419,396   344,271  
PSUs | Peer Companies          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected stock price volatility 24.80% 25.30%      
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     37,265  
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost $ 6,000,000 $ 2,000,000   $ 8,000,000  
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
[1] 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.