v3.26.1
Revenue - Revenue by Major Species (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]
Companion animal        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 1,708 1,790 3,227 3,331
Companion animal | U.S.        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 1,044 1,176 1,909 2,149
Companion animal | International        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 664 614 1,318 1,182
Livestock        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 731 651 1,451 1,278
Livestock | U.S.        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 222 180 447 390
Livestock | International        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 509 471 1,004 888
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
Operating Segments | U.S.        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue 1,266 1,356 2,356 2,539
Operating Segments | International        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenue $ 1,173 $ 1,085 $ 2,322 [3] $ 2,070 [3]
[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.
[3] Revenue denominated in euros was $545 million and $480 million for the six months ended June 30, 2026 and 2025, respectively.