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Acquisitions, Research Collaborations and License Agreements - Fair Values of Assets Acquired and Liabilities Assumed (Details) $ in Millions | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 16, 2020 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 18,862 | $ 18,882 |
ArQule |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  |  | $ 145
IPR&D MK-1026 (formerly ARQ 531) |  |  | 2,280
Licensing arrangement for ARQ 087 |  |  | 80
Deferred income tax liabilities |  |  | (361)
Other assets (liabilities), net |  |  | 34
Total identifiable net assets |  |  | 2,178
Goodwill |  |  | 512
Consideration transferred |  |  | $ 2,690
ArQule | Measurement Input, Discount Rate |  |  |
Business Acquisition [Line Items] |  |  |
Present value discount rate |  |  | 0.125

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