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Acquisitions - Summarized Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2021	Mar. 04, 2021	Dec. 31, 2020	Oct. 23, 2020
MYR
Intangible assets:
Deferred income taxes, net		$ (513)
Other assets (and liabilities), net		(187)
Total identifiable net assets		1,335
Goodwill		226
Total consideration		1,561
MYR | Acquired IPR&D
Intangible assets:
Acquired IPR&D		1,190
MYR | Hepcludex
Intangible assets:
Finite-lived intangible asset		$ 845
Immunomedics, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents				$ 726
Inventories	$ 294		$ 797	946
Intangible assets:
Deferred income taxes, net				(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				20,597
Immunomedics, Inc. | Acquired IPR&D
Intangible assets:
Acquired IPR&D				15,760
Immunomedics, Inc. | Trodelvy
Intangible assets:
Finite-lived intangible asset				4,600
Immunomedics, Inc. | Outlicense contract
Intangible assets:
Finite-lived intangible asset				$ 175

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