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Acquisitions, Divestitures, Research Collaborations and Licensing Agreements - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jul. 09, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 21,697 |  | $ 21,197
Elanco Animal Health Incorporated Aqua Business |  |  |
Business Acquisition [Line Items] |  |  |
Inventories |  | $ 74 |
Property, plant and equipment |  | 67 |
Other assets and liabilities, net |  | 24 |
Total identifiable net assets |  | 796 |
Goodwill |  | 505 |
Consideration transferred |  | $ 1,301 |
Discount rate |  | 8.50% |
Elanco Animal Health Incorporated Aqua Business | Product Rights |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | $ 340 |
Elanco Animal Health Incorporated Aqua Business | Other Product Rights |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | $ 291 |
Identifiable intangible assets, useful life |  | 15 years |

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