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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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