v3.26.1
Revenue - Revenue by Product (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue $ 2,468 $ 2,474 [1] $ 4,730 $ 4,672 [2]
Total products and services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 2,439 2,441 4,678 4,609
Parasiticides        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 698 660 1,284 1,232
Vaccines        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 521 510 1,040 949
Dermatology        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 398 473 747 852
Anti-infectives        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 244 222 485 460
Pain and sedation        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 217 223 420 430
Other pharmaceutical        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 168 175 326 333
Animal health diagnostics        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 123 110 240 214
Other non-pharmaceutical        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 70 68 136 139
Contract manufacturing & human health        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue $ 29 $ 33 $ 52 $ 63
[1] See Note 2. Basis of Presentation for further detail regarding the Fiscal Year Alignment.
[2] See Note 2. Basis of Presentation for further detail regarding the Fiscal Year Alignment.