v3.25.4
Goodwill and other intangible assets - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, net   $ 21,566 $ 26,639    
Impairment charge   $ 1,200      
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]   Other General Expense      
Intangible assets, net   $ 22,276 27,699    
Amortization charges associated with finite-lived intangible assets   4,300 4,800 $ 3,200  
Total estimated amortization of finite-lived intangible assets for 2026   3,600      
Total estimated amortization of finite-lived intangible assets for 2027   3,500      
Total estimated amortization of finite-lived intangible assets for 2028   2,800      
Total estimated amortization of finite-lived intangible assets for 2029   2,300      
Total estimated amortization of finite-lived intangible assets for 2030   2,200      
Finite-lived intangible assets, gross   54,350 55,062    
In-process research and development          
Finite-Lived Intangible Assets [Line Items]          
IPR&D impairment charge       $ 783  
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]       Other General Expense  
Developed-product-technology rights          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, net   21,051 26,017    
Finite-lived intangible assets, gross   47,805 $ 48,611    
Otezla | Developed-product-technology rights          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, fair value disclosure $ 4,000 3,000      
Finite-lived intangible assets, net 4,800 3,400      
Impairment charge $ 800 400      
TAVNEOS | Developed-product-technology rights          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross   2,500      
TAVNEOS, US Market | Developed-product-technology rights          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross   $ 2,400      
UPLIZNA | In-process research and development          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net         $ 350
UPLIZNA | In-process research and development          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life         11 years