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Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]      
Total foreign currency forward-exchange contracts $ (6) $ (38)  
Unrecognized net gains/(losses) on derivative instruments [1] 36 42 $ (58)
Foreign Exchange Forward | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value [Line Items]      
Total foreign currency forward-exchange contracts (1) (1)  
Gain (loss) on derivative contracts not designated as hedging instruments $ (58) (20)  
Foreign Exchange Forward | Derivatives Not Designated as Hedging Instruments | Maximum      
Derivatives, Fair Value [Line Items]      
Derivative, Term of Contract 3 years    
Foreign Exchange Forward | Derivatives Not Designated as Hedging Instruments | Minimum      
Derivatives, Fair Value [Line Items]      
Derivative, Term of Contract 60 days    
Foreign Exchange Forward | Derivatives Not Designated as Hedging Instruments | Other current assets      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts $ (22) (16)  
Foreign Exchange Forward | Derivatives Not Designated as Hedging Instruments | Other current liabilities      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts (21) (15)  
Forward Starting Interest Rate Swap Contract [Member] | Derivatives Designated as Hedging Instruments | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Total foreign currency forward-exchange contracts (10) (17)  
Forward Starting Interest Rate Swap Contract [Member] | Derivatives Designated as Hedging Instruments | Other non-current liabilities      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts 0 (5)  
Cross-currency interest rate swap contracts | Derivatives Designated as Hedging Instruments      
Derivatives, Fair Value [Line Items]      
Unrecognized net gains/(losses) on derivative instruments 36 42  
Gains/(losses) on derivative instruments 16 12  
Collateral received 21 23  
Additional Collateral, Aggregate Fair Value $ 8    
Cross-currency interest rate swap contracts | Derivatives Designated as Hedging Instruments | Maximum      
Derivatives, Fair Value [Line Items]      
Derivative, Term of Contract 3 years    
Cross-currency interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other current assets      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts $ (21) (12)  
Cross-currency interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other current liabilities      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts 9 3  
Cross-currency interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts (19) (14)  
Cross-currency interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other non-current liabilities      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts 4 0  
Fixed to Floating Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments | Other non-current liabilities      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts 0 2  
Forward starting interest rate swap contracts | Derivatives Designated as Hedging Instruments      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts 5 37  
Unrecognized net gains/(losses) on derivative instruments (2) 18  
zts_FixedtoFloatInterestRateSwap | Derivatives Designated as Hedging Instruments | Other non-current liabilities      
Derivatives, Fair Value [Line Items]      
Foreign currency forward-exchange contracts $ 32 $ 0  
[1] Presented net of reclassification adjustments, which are not material in any period presented. Reclassification adjustments related to benefit plans are generally reclassified, as part of net periodic pension cost, into Cost of sales, Selling, general and administrative expenses, and/or Research and development expenses, as appropriate, in the Consolidated Statements of Income.