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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Decrease in goodwill		$ 18	$ 2
Accumulated goodwill impairment losses		0
Aggregate amortization expense related to finite-lived intangible assets		$ 1,800	$ 1,700	$ 1,200
Discount rate of acquired IPR&D		7.50%	6.50%	8.00%
In-process research and development impairment		$ 2,700	$ 0	$ 0
In Process Research And Development Trodelvy For HR+/HER2-
Intangible Assets [Line Items]
Indefinite-lived intangible assets, fair value	$ 6,100	6,100
In Process Research And Development Trodelvy For HR+/HER2- | Fair Value, Nonrecurring
Intangible Assets [Line Items]
In-process research and development impairment	2,700	2,700
MYR
Intangible Assets [Line Items]
Decrease in goodwill	$ 18	$ 18
Immunomedics, Inc. | In Process Research And Development Trodelvy For HR+/HER2-
Intangible Assets [Line Items]
Aggregate fair value of acquired IPR&D				$ 8,800
Immunomedics, Inc. | In Process Research And Development Trodelvy For HR+/HER2- | Measurement Input, Discount Rate
Intangible Assets [Line Items]
Discount rate, measurement input	6.75%

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