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Acquisitions, Research Collaborations and Licensing Agreements - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Jul. 09, 2024
Business Combination [Line Items]      
Goodwill $ 21,587 $ 21,668  
Elanco Animal Health Incorporated Aqua Business      
Business Combination [Line Items]      
Inventories     $ 65
Property, plant and equipment     66
Deferred tax asset     106
Other assets and liabilities, net     23
Total identifiable net assets     891
Goodwill     412
Consideration transferred     $ 1,303
Discount rate     8.50%
Elanco Animal Health Incorporated Aqua Business | Product Rights      
Business Combination [Line Items]      
Product rights and other     $ 340
Estimated useful life of intangible assets     15 years
Elanco Animal Health Incorporated Aqua Business | Other Product Rights      
Business Combination [Line Items]      
Product rights and other     $ 291
Estimated useful life of intangible assets     15 years