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Segmentation of key figures - Net sales and other revenues by segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disclosure of operating segments [line items]        
Net sales $ 2,577 $ 2,482 $ 5,028 $ 4,926
Total other revenues 19 14 41 29
Net sales and other revenues 2,596 2,496 5,069 4,955
Operating segments        
Disclosure of operating segments [line items]        
Net sales 2,577 2,482 5,028 4,926
Surgical | Operating segments        
Disclosure of operating segments [line items]        
Net sales 1,455 1,423 2,786 2,761
Total other revenues 0 0 1 0
Surgical | Implantables | Operating segments        
Disclosure of operating segments [line items]        
Net sales 456 464 876 897
Surgical | Consumables | Operating segments        
Disclosure of operating segments [line items]        
Net sales 777 736 1,489 1,422
Surgical | Equipment/other | Operating segments        
Disclosure of operating segments [line items]        
Net sales 222 223 421 442
Vision Care | Operating segments        
Disclosure of operating segments [line items]        
Net sales 1,122 1,059 2,242 2,165
Total other revenues 19 14 40 29
Vision Care | Contact lenses | Operating segments        
Disclosure of operating segments [line items]        
Net sales 692 636 1,380 1,307
Vision Care | Ocular health | Operating segments        
Disclosure of operating segments [line items]        
Net sales $ 430 $ 423 $ 862 $ 858