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Goodwill and Intangible Assets - Definite-Lived Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Aug. 29, 2023
Definite-lived intangible assets
Amortization of intangible assets					$ 7,622	$ 7,946	$ 7,689
Finite-Lived Intangible Assets, Net		$ 55,307			54,866	55,307
Finite-Lived Intangible Assets, Fair Value Disclosure								$ 4,000
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]			Cost of products sold
Anticipated annual amortization expense
2025					7,300
2026					6,700
2027					6,100
2028					6,300
2029					5,700
Imbruvica
Definite-lived intangible assets
Definite-lived intangible assets impairment charges	$ 2,100
Vuity
Definite-lived intangible assets
Definite-lived intangible assets impairment charges				$ 770
Coolsculpting
Definite-lived intangible assets
Finite-Lived Intangible Assets, Fair Value Disclosure		1,300				1,300
Liletta
Definite-lived intangible assets
Finite-Lived Intangible Assets, Fair Value Disclosure		561				561
Liletta and Coolsculpting
Definite-lived intangible assets
Definite-lived intangible assets impairment charges		1,400
Developed product rights
Definite-lived intangible assets
Finite-Lived Intangible Assets, Net		52,687			53,175	52,687
Developed product rights \| Imbruvica
Definite-lived intangible assets
Finite-Lived Intangible Assets, Net								$ 1,900
Developed product rights \| Coolsculpting
Definite-lived intangible assets
Finite-Lived Intangible Assets, Net		290				290
Developed product rights \| Liletta
Definite-lived intangible assets
Finite-Lived Intangible Assets, Net		241				241
License agreements
Definite-lived intangible assets
Finite-Lived Intangible Assets, Net		$ 2,620			$ 1,691	$ 2,620
Minimum
Definite-lived intangible assets
Amortization period					1 year
Maximum
Definite-lived intangible assets
Amortization period					16 years
Weighted Average \| Developed product rights
Definite-lived intangible assets
Amortization period					12 years
Weighted Average \| License agreements
Definite-lived intangible assets
Amortization period					11 years