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Acquisitions, Divestitures, Research Collaborations and Licensing Agreements - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Jul. 09, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 21,668 |  | $ 21,197 | $ 21,204
Elanco Animal Health Incorporated Aqua Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Inventories |  | $ 65 |  |
Property, plant and equipment |  | 66 |  |
Other assets and liabilities, net |  | 23 |  |
Total identifiable net assets |  | 785 |  |
Goodwill |  | 518 |  |
Consideration transferred |  | $ 1,303 |  |
Discount rate |  | 8.50% |  |
Elanco Animal Health Incorporated Aqua Business | Product Rights - Clynay |  |  |  |
Business Acquisition [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 Acquisition [Line Items] |  |  |  |
Product rights and other |  | $ 291 |  |
Estimated useful life of intangible assets |  | 15 years |  |

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