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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Goodwill and Intangible Assets [Line Items]    
Goodwill $ 23,971 $ 23,108
Increase in goodwill due to foreign currency translation adjustments 815  
Amount of reductions of goodwill relating to impairments 0  
Gross amount of amortizable intangible assets 27,500 27,100
Accumulated amortization of intangible assets 22,800 21,300
Decrease in intangible assets due to foreign currency translation adjustments 76  
Estimated annual amortization expense, intangible assets, 2025 1,700  
Estimated annual amortization expense, intangible assets, 2026 1,500  
Estimated annual amortization expense, intangible assets, 2027 1,200  
Estimated annual amortization expense, intangible assets, 2028 700  
Estimated annual amortization expense, intangible assets, 2029 600  
Indefinite-lived intangible assets related to in-process R&D acquired in a business combination 894 $ 784
Established Pharmaceuticals    
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 $ 17,400