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Acquisitions - Summarized Fair Values of Assets Acquired and Liabilities Assumed (Details) - Immunomedics, Inc. $ in Millions	Oct. 23, 2020 USD ($)
Business Acquisition [Line Items]
Cash and cash equivalents	$ 726
Inventories	946
Intangible assets
Deferred income taxes	(4,565)
Liability related to future royalties	(1,100)
Other assets (and liabilities), net	64
Total identifiable net assets	16,606
Goodwill	3,991
Total consideration transferred	20,597
Acquired IPR&D
Intangible assets
Acquired IPR&D	15,760
Intangible asset - Trodelvy for mTNBC
Intangible assets
Finite-lived intangible asset	4,600
Outlicense contract
Intangible assets
Finite-lived intangible asset	$ 175

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