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Segmentation of key figures - Segment contribution and reconciliation to income before taxes (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
Other revenues 19 14 41 29
Cost of net sales (1,196) (1,108) (2,267) (2,171)
Cost of other revenues (12) (14) (31) (28)
Selling, general & administration (870) (837) (1,683) (1,639)
Research & development (245) (220) (467) (419)
Other income 5 5 154 11
Other expense (31) (4) (60) (23)
Operating income 247 318 715 686
Interest expense (51) (50) (100) (95)
Other financial income & expense 4 12 13 24
Share of (loss) from associated companies (1) 0 (15) 0
Income before taxes 199 280 613 615
Operating segments        
Disclosure of operating segments [line items]        
Net sales 2,577 2,482 5,028 4,926
Operating segments | Surgical        
Disclosure of operating segments [line items]        
Net sales 1,455 1,423 2,786 2,761
Other revenues 0 0 1 0
Cost of net sales (553) (510) (1,049) (980)
Cost of other revenues 0 0 (1) 0
Selling, general & administration (372) (368) (728) (720)
Research & development (152) (142) (295) (272)
Other income 0 0 0 0
Other expense 0 0 0 0
Operating income 378 403 714 789
Operating segments | Vision Care        
Disclosure of operating segments [line items]        
Net sales 1,122 1,059 2,242 2,165
Other revenues 19 14 40 29
Cost of net sales (416) (422) (813) (838)
Cost of other revenues (12) (14) (30) (28)
Selling, general & administration (415) (390) (788) (758)
Research & development (90) (67) (162) (132)
Other income 0 0 0 0
Other expense 0 0 0 0
Operating income 208 180 489 438
Not allocated to segments        
Disclosure of operating segments [line items]        
Net sales 0 0 0 0
Other revenues 0 0 0 0
Cost of net sales (227) (176) (405) (353)
Cost of other revenues 0 0 0 0
Selling, general & administration (83) (79) (167) (161)
Research & development (3) (11) (10) (15)
Other income 5 5 154 11
Other expense (31) (4) (60) (23)
Operating income (339) (265) (488) (541)
Interest expense (51) (50) (100) (95)
Other financial income & expense 4 12 13 24
Share of (loss) from associated companies $ (1) $ 0 $ (15) $ 0