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Acquisitions, Research Collaborations and License Agreements - Fair Value of Assets Acquired and Liabilities Assumed (Details) $ in Millions | Mar. 31, 2020 USD ($) | Jan. 16, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Goodwill | $ 19,767 |  | $ 19,425
ArQule |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Cash and cash equivalents |  | $ 145 |
Licensing arrangement |  | 80 |
Deferred income tax liabilities |  | (434) |
Other assets and liabilities, net |  | 35 |
Total identifiable net assets |  | 2,276 |
Goodwill |  | 414 |
Consideration transferred |  | $ 2,690 |
Measurement Input, Discount Rate | ArQule |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Present value discount rate |  | 0.125 |
IPR&D MK-1026 | ArQule |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
IPR&D |  | $ 2,280 |
IPR&D MK-7075 | ArQule |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
IPR&D |  | $ 170 |

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