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Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	5 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 11, 2024
Definite-lived intangible assets
Gross carrying amount		$ 89,743	$ 89,743	$ 83,333
Accumulated amortization		(34,877)	(34,877)	(28,026)
Net carrying amount		54,866	54,866	55,307
Indefinite-lived intangible assets		5,202	5,202	303
Total intangible assets gross carrying amount		94,945	94,945	83,636
Total intangible assets, net		$ 60,068	60,068	55,610
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]	Research and development	Research and development
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets		$ 5,202	5,202	303
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure						$ 6,900
Impairment of intangible assets			4,476	4,229	$ 770
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]	Research and development	Research and development
Emraclidine
Definite-lived intangible assets
Indefinite-lived intangible assets						2,400
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets						$ 2,400
AGN-151607
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 630
Developed product rights
Definite-lived intangible assets
Gross carrying amount		$ 81,428	81,428	75,142
Accumulated amortization		(28,253)	(28,253)	(22,455)
Net carrying amount		53,175	53,175	52,687
License agreements
Definite-lived intangible assets
Gross carrying amount		8,315	8,315	8,191
Accumulated amortization		(6,624)	(6,624)	(5,571)
Net carrying amount		$ 1,691	$ 1,691	$ 2,620