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Intangible assets other than goodwill (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Disclosure of detailed information about intangible assets [line items]        
Impairment of intangibles $ 61 $ 0 $ 61 $ 45
Discount rate, measurement input | Intangible assets        
Disclosure of detailed information about intangible assets [line items]        
Significant unobservable input, assets 0.078   0.078  
Surgical        
Disclosure of detailed information about intangible assets [line items]        
Recoverable amount of CGU $ 15   $ 15  
Surgical | Cost of net sales        
Disclosure of detailed information about intangible assets [line items]        
Impairment of intangibles 59   59  
Vision Care        
Disclosure of detailed information about intangible assets [line items]        
Recoverable amount of CGU   $ 48   48
Vision Care | Cost of net sales        
Disclosure of detailed information about intangible assets [line items]        
Impairment of intangibles       $ 45
Vision Care | Research and development        
Disclosure of detailed information about intangible assets [line items]        
Impairment of intangibles $ 2   $ 2