Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 23,679	$ 22,799
Increase in goodwill	576
Increase (decrease) in goodwill due to foreign currency translation adjustments	304	(431)
Amount of reductions of goodwill relating to impairments	0	0
Gross amount of amortizable intangible assets	27,700	27,200
Increase in amortizable intangible assets	305
Accumulated amortization of intangible assets	19,700	17,600
Increase (decrease) in intangible assets due to foreign currency translation adjustments	44	(150)
Estimated annual amortization expense, intangible assets, year one	1,900
Estimated annual amortization expense, intangible assets, year two	1,700
Estimated annual amortization expense, intangible assets, year three	1,600
Estimated annual amortization expense, intangible assets, year four	1,300
Estimated annual amortization expense, intangible assets, year five	700
Indefinite-lived intangible assets related to in-process R&D acquired in a business combination	787	$ 807
Increase in in-process research and development assets	$ 80
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]	Research and development	Research and development
Minimum
Goodwill and Intangible Assets [Line Items]
Amortization period of intangible assets	2 years
Maximum
Goodwill and Intangible Assets [Line Items]
Amortization period of intangible assets	20 years
Established Pharmaceutical Products
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 2,700
Nutritional Products
Goodwill and Intangible Assets [Line Items]
Goodwill	285
Diagnostic Products
Goodwill and Intangible Assets [Line Items]
Goodwill	3,600
Medical Devices
Goodwill and Intangible Assets [Line Items]
Goodwill	17,100
Impairment of indefinite-lived intangible assets in-process research and development project	$ 100	$ 111