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Revenue - Revenue by Species (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue from External Customer [Line Items]    
Revenue $ 1,455 $ 1,366
Cattle    
Revenue from External Customer [Line Items]    
Revenue 380 416
Swine    
Revenue from External Customer [Line Items]    
Revenue 149 175
Poultry    
Revenue from External Customer [Line Items]    
Revenue 139 136
Fish    
Revenue from External Customer [Line Items]    
Revenue 23 22
Other    
Revenue from External Customer [Line Items]    
Revenue 16 21
Livestock    
Revenue from External Customer [Line Items]    
Revenue 707 770
Horses    
Revenue from External Customer [Line Items]    
Revenue 688 549
Horses    
Revenue from External Customer [Line Items]    
Revenue 41 41
Companion animal    
Revenue from External Customer [Line Items]    
Revenue $ 729 $ 590