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Goodwill and other intangible assets - Goodwill and intangible asset by segment (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill $ 9,060 $ 9,689
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 8,926 8,926
Alcon brand name    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,980 2,980
Acquired in-process research & development    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 739 739
Technologies    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 60 91
Currently marketed products    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,018 2,380
Marketing know-how    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,861 3,099
Other (including software)    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 402 400
Operating segments | Surgical    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 4,260 4,577
Operating segments | Surgical | Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 4,544 4,544
Operating segments | Surgical | Acquired in-process research & development    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 564 564
Operating segments | Surgical | Technologies    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 60 91
Operating segments | Surgical | Currently marketed products    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 534 583
Operating segments | Surgical | Marketing know-how    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,861 3,099
Operating segments | Surgical | Other (including software)    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 241 240
Operating segments | Vision Care    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 1,820 2,132
Operating segments | Vision Care | Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 4,382 4,382
Operating segments | Vision Care | Acquired in-process research & development    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 175 175
Operating segments | Vision Care | Currently marketed products    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 1,484 1,797
Operating segments | Vision Care | Other (including software)    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 161 160
Not allocated to segments    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,980 2,980
Not allocated to segments | Alcon brand name    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill $ 2,980 $ 2,980