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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 ($)
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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Business Combination, Recognized Identifiable Assets Acquired (Liabilities) Assumed, Other Assets And Liabilities, Net

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Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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