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Acquisitions, divestment of product rights and out-licensing - Additional information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 17, 2024
USD ($)
Jul. 01, 2024
USD ($)
Nov. 21, 2022
USD ($)
product
$ / shares
Jan. 07, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2024
USD ($)
Disclosure of detailed information about business combination [line items]                        
Goodwill         $ 8,926,000,000 $ 8,946,000,000   $ 8,946,000,000 $ 8,946,000,000 $ 8,926,000,000 $ 8,926,000,000  
Consideration paid for acquisition of businesses                 61,000,000 0 666,000,000  
Current income tax liabilities         175,000,000 104,000,000   104,000,000 104,000,000 114,000,000 175,000,000  
Pro forma net sales                     8,776,000,000  
Pro forma net income                     192,000,000  
Acquisitions of assets, net of cash acquired                 0 2,000,000 485,000,000  
Net gain on product divestments                 57,000,000 0 0  
Deferred income, current           73,000,000   73,000,000 73,000,000 78,000,000    
Deferred income           86,000,000   86,000,000 86,000,000 32,000,000    
China divestment of product rights and out-licensing                        
Disclosure of detailed information about business combination [line items]                        
Divestment, value of ordinary shares received $ 116,000,000                      
Divestment, percentage of ordinary shares received 16.70%                      
Divestment, transaction costs capitalized $ 2,000,000                      
Divestment, additional potential consideration 50,000,000                      
Net gain on product divestments           57,000,000            
Divestment, net carrying value of divested rights $ 2,000,000                      
Supply agreement, term 15 years                      
Deferred income, current $ 2,000,000                      
Deferred income $ 54,000,000                      
Ivantis, Inc.                        
Disclosure of detailed information about business combination [line items]                        
Percentage of voting equity interests acquired (as a percent)       100.00%                
Acquisitions of assets, net of cash acquired                     477,000,000  
Acquisition of assets, upfront consideration       $ 479,000,000                
Acquisition of assets, direct acquisition costs                     2,000,000  
BELKIN Vision Ltd.                        
Disclosure of detailed information about business combination [line items]                        
Percentage of voting equity interests acquired (as a percent)   100.00%                    
Goodwill   $ 20,000,000                   $ 20,000,000
Consideration transferred   92,000,000                   92,000,000
Previously-held FVOCI financial investments   20,000,000                   20,000,000
Consideration paid for acquisition of businesses   61,000,000       $ 1,000,000            
Contingent consideration, maximum amount   $ 385,000,000                    
Contingent consideration                       6,000,000
Acquisition and integration costs                 $ 1,000,000      
Acquired business, increase in net sales               1,000,000        
Acquired business, reduction in net income               $ 4,000,000        
BELKIN Vision Ltd. | Level 3                        
Disclosure of detailed information about business combination [line items]                        
Contingent consideration                       $ 6,000,000
Aerie Pharmaceuticals, Inc.                        
Disclosure of detailed information about business combination [line items]                        
Percentage of voting equity interests acquired (as a percent)     100.00%                  
Goodwill     $ 65,000,000       $ 21,000,000     21,000,000    
Consideration transferred     744,000,000             $ 744,000,000    
Consideration paid for acquisition of businesses     $ 666,000,000                  
Acquisition and integration costs                     $ 20,000,000  
Acquired business, increase in net sales         16,000,000              
Acquired business, reduction in net income         $ 32,000,000              
Number of products acquired | product     2                  
Price paid (in dollars per share) | $ / shares     $ 15.25                  
Contingent liability             $ 58,000,000