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Acquisitions, Research Collaborations and License Agreements - Values of Assets Acquired and Liabilities Assumed, ArQule (Details) $ in Millions | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 16, 2020 USD ($)
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Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Goodwill | $ 20,212 | $ 20,238 |
ArQule |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Cash and cash equivalents |  |  | $ 145
IPR&D |  |  | 2,280
Intangible assets |  |  | 80
Deferred income tax liabilities |  |  | (361)
Other assets and liabilities, net |  |  | 34
Total identifiable net assets |  |  | 2,178
Goodwill |  |  | 512
Consideration transferred |  |  | $ 2,690
ArQule | Measurement Input, Discount Rate |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Present value discount rate |  |  | 0.125

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