v3.26.1
Significant acquisition of businesses (Details) - USD ($)
Feb. 27, 2026
Jun. 30, 2026
Dec. 31, 2025
Disclosure of detailed information about business combination [line items]      
Identifiable assets acquired (liabilities assumed)   $ 10,600,000,000  
Goodwill recognised as of acquisition date   1,400,000,000  
Other current assets recognised as of acquisition date   100,000,000  
Intangible assets other than goodwill   42,074,000,000 $ 29,411,000,000
Marketable securities recognised as of acquisition date   700,000,000  
Cash acquired recognized as of acquisition date   $ 400,000,000  
Avidity Biosciences, Inc.      
Disclosure of detailed information about business combination [line items]      
Portion of consideration paid (received) consisting of cash and cash equivalents $ 12,000,000,000.0    
Identifiable assets acquired (liabilities assumed) 10,600,000,000    
Goodwill recognised as of acquisition date 1,400,000,000    
Cash offer per ordinary share 72.00    
Deferred tax liability (asset) 1,900,000,000    
Other net assets liabilities 100,000,000    
Marketable securities recognised as of acquisition date 700,000,000    
Cash acquired recognized as of acquisition date 400,000,000    
Avidity Biosciences, Inc. | Acquired research and development [member]      
Disclosure of detailed information about business combination [line items]      
Intangible assets other than goodwill 11,300,000,000    
Avidity Biosciences, Inc. | Acquired research and development [member] | DM1 [member]      
Disclosure of detailed information about business combination [line items]      
Intangible assets other than goodwill $ 7,500,000,000