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Segment Information - Segment Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]      
Inventory Adjustments $ 69    
Number of Operating Segments | segment 2    
Assets $ 11,545 $ 10,777  
Proceeds from Sale of Buildings 20    
CEO Transition Costs [Member]      
Segment Reporting Information [Line Items]      
Restructuring and Other Cost Productivity Charges 10    
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Litigation Settlement, Expense     $ 5
Stand Up Costs     3
Charges to operating model     3
Segment Reconciling Items | Zoetis Initiatives      
Segment Reporting Information [Line Items]      
Restructuring and Other Cost Productivity Charges $ 7 9 20
Employee Severance [Member] | Europe      
Segment Reporting Information [Line Items]      
Severance Costs   $ 7 $ 4