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Acquisitions, Research Collaborations and Licensing Agreements - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2021 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 19, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 21,197 | $ 21,204 | $ 21,264 |
Acceleron Pharma Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 340
Investments |  |  |  |  | 285
IPR&D - sotatercept |  |  |  |  | 6,380
Product rights - Reblozyl (12 year useful life) |  |  |  |  | 3,830
Estimated useful life of intangible assets, acquired | 12 years |  |  |  |
Deferred income tax liabilities, net |  |  |  |  | (1,814)
Other assets and liabilities, net |  |  |  |  | 82
Total identifiable net assets |  |  |  |  | 9,103
Goodwill |  |  |  |  | 2,411
Consideration transferred |  |  |  |  | $ 11,514
Acceleron Pharma Inc. | Measurement Input, Discount Rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Present value discount rate |  |  |  |  | 0.075
Discount rate |  |  |  |  | 0.060

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