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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 ($)
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