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Goodwill and intangible assets - Intangible asset impairment charges (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges $ (61)         $ 62 $ 225 $ 167  
Cash flow projection forecast duration           5 years      
Discount rate, measurement input                  
Disclosure of detailed information about intangible assets [line items]                  
Significant unobservable input, assets | shares 0.078                
Research and development                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges             (180)    
Cost of net sales                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges               106  
Surgical                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges           $ 60 178 66  
Recoverable amount $ 15             65  
Surgical | Discount rate, measurement input                  
Disclosure of detailed information about intangible assets [line items]                  
Significant unobservable input, assets | shares           0.075      
Surgical | Research and development                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges     $ 178            
Surgical | Cost of net sales                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges (59)             65  
Vision Care                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges           $ 2 $ 47 101  
Recoverable amount       $ 48         $ 88
Vision Care | Discount rate, measurement input                  
Disclosure of detailed information about intangible assets [line items]                  
Significant unobservable input, assets | shares           0.070      
Vision Care | Research and development                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges $ 2 $ 2     $ (61)        
Vision Care | Cost of net sales                  
Disclosure of detailed information about intangible assets [line items]                  
Impairment charges       $ 45       $ 41