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Goodwill and other intangible assets - Summary of movements of goodwill and intangible assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   $ 9,689    
Amortization charge   745 $ 653 $ 590
Impairment charges $ (61) 0 (62) (225)
Intangible assets and goodwill at end of period   9,060 9,689  
Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   22,138 20,507  
Impact of business combination     1,025  
Impact of asset acquisitions   2 407  
Additions   115 208  
Disposals and derecognitions   (14) (9)  
Intangible assets and goodwill at end of period   22,241 22,138 20,507
Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   (12,449) (11,742)  
Amortization charge   (745) (653)  
Disposals and derecognitions   13 8  
Impairment charges     (62)  
Intangible assets and goodwill at end of period   (13,181) (12,449) (11,742)
Goodwill        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   8,926    
Intangible assets and goodwill at end of period   8,926 8,926  
Goodwill | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   8,926 8,905  
Impact of business combination     21  
Intangible assets and goodwill at end of period   8,926 8,926 8,905
Goodwill | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   0 0  
Intangible assets and goodwill at end of period   0 0 0
Alcon brand name        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   2,980    
Intangible assets and goodwill at end of period   2,980 2,980  
Alcon brand name | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   2,980 2,980  
Intangible assets and goodwill at end of period   2,980 2,980 2,980
Alcon brand name | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   0 0  
Intangible assets and goodwill at end of period   0 0 0
Acquired in-process research & development        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   739    
Intangible assets and goodwill at end of period   739 739  
Acquired in-process research & development | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   920 737  
Impact of business combination     175  
Impact of asset acquisitions     10  
Disposals and derecognitions   (2) (2)  
Intangible assets and goodwill at end of period   918 920 737
Acquired in-process research & development | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   (181) (180)  
Disposals and derecognitions   2 2  
Impairment charges     (3)  
Intangible assets and goodwill at end of period   (179) (181) (180)
Technologies        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   91    
Intangible assets and goodwill at end of period   60 91  
Technologies | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   5,369 5,369  
Intangible assets and goodwill at end of period   5,369 5,369 5,369
Technologies | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   (5,278) (5,238)  
Amortization charge   (31) (40)  
Intangible assets and goodwill at end of period   (5,309) (5,278) (5,238)
Currently marketed products        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   2,380    
Intangible assets and goodwill at end of period   2,018 2,380  
Currently marketed products | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   6,189 4,803  
Impact of business combination     850  
Impact of asset acquisitions     385  
Additions   19 151  
Disposals and derecognitions   (4)    
Intangible assets and goodwill at end of period   6,204 6,189 4,803
Currently marketed products | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   (3,809) (3,471)  
Amortization charge   (381) (279)  
Disposals and derecognitions   4    
Impairment charges     (59)  
Intangible assets and goodwill at end of period   (4,186) (3,809) (3,471)
Marketing know-how        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   3,099    
Intangible assets and goodwill at end of period   2,861 3,099  
Marketing know-how | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   5,960 5,960  
Intangible assets and goodwill at end of period   5,960 5,960 5,960
Marketing know-how | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   (2,861) (2,622)  
Amortization charge   (238) (239)  
Intangible assets and goodwill at end of period   (3,099) (2,861) (2,622)
Other intangible assets (including software)        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   400    
Intangible assets and goodwill at end of period   402 400  
Other intangible assets (including software) | Cost        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   720 658  
Impact of asset acquisitions   2 12  
Additions   96 57  
Disposals and derecognitions   (8) (7)  
Intangible assets and goodwill at end of period   810 720 658
Other intangible assets (including software) | Accumulated depreciation        
Reconciliation of changes in intangible assets and goodwill [abstract]        
Intangible assets and goodwill at beginning of period   (320) (231)  
Amortization charge   (95) (95)  
Disposals and derecognitions   7 6  
Intangible assets and goodwill at end of period   $ (408) $ (320) $ (231)