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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Intangible Assets [Line Items]
Accumulated goodwill impairment losses					$ 0
Aggregate amortization expense related to finite-lived intangible assets					$ 2,400	$ 2,300	$ 1,800
Discount rate of acquired IPR&D			7.50%		7.25%	7.50%	7.50%
In-process research and development impairments					$ 4,180	$ 50	$ 2,700
Fair Value, Nonrecurring | Galapagos
Intangible Assets [Line Items]
Aggregate amortization expense related to finite-lived intangible assets						$ 51
In Process Research And Development NSCLC
Intangible Assets [Line Items]
In-process research and development impairments	$ 1,800	$ 2,400
In Process Research And Development Bulevirtide | Fair Value, Nonrecurring
Intangible Assets [Line Items]
In-process research and development impairments			$ 50
In Process Research And Development Trodelvy For HR+/HER2-
Intangible Assets [Line Items]
Indefinite-lived intangible assets, fair value				$ 6,100
In Process Research And Development Trodelvy For HR+/HER2- | Fair Value, Nonrecurring
Intangible Assets [Line Items]
In-process research and development impairments				$ 2,700
Immunomedics, Inc. | In Process Research And Development NSCLC | Measurement Input, Discount Rate
Intangible Assets [Line Items]
Discount rate, measurement input	7.00%	7.00%
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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