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Goodwill and intangible assets - Goodwill and intangible asset by segment (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill $ 9,689 $ 8,765
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 8,970 8,905
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 739 557
Technologies    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 91 131
Currently marketed products    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,380 1,332
Marketing know-how    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 3,099 3,338
Other (including software)    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 400 427
Operating segments | Technologies    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 91  
Operating segments | Surgical    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 4,577 4,504
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 564 555
Operating segments | Surgical | Technologies    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 91 131
Operating segments | Surgical | Currently marketed products    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 583 229
Operating segments | Surgical | Marketing know-how    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 3,099 3,338
Operating segments | Surgical | Other (including software)    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 240 251
Operating segments | Vision Care    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 2,132 1,281
Operating segments | Vision Care | Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 4,426 4,361
Operating segments | Vision Care | Acquired in-process research & development    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 175 2
Operating segments | Vision Care | Currently marketed products    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 1,797 1,103
Operating segments | Vision Care | Other (including software)    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill 160 176
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