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Significant transactions (Details 2) - USD ($)
$ in Millions
12 Months Ended
Apr. 08, 2019
Dec. 31, 2019
Mar. 31, 2019
Disclosure of detailed information about business combination [line items]      
Gain on distribution of Alcon Inc. to Novartis AG shareholders $ 4,691 $ 4,691  
Discontinued operations      
Disclosure of detailed information about business combination [line items]      
Net assets derecognized (20,025)    
Derecognition of distribution liability 23,434    
Difference between net assets and distribution liability 3,409    
Distribution of dividend to dividend bearing shares 1,273    
Cumulative currency translation gains/losses recycled through income statement 123    
Transaction costs recognized in the consolidated income statement $ (114)    
Gain on distribution of Alcon Inc. to Novartis AG shareholders   $ 4,691  
Alcon | Discontinued operations      
Disclosure of detailed information about business combination [line items]      
Derecognition of distribution liability     $ 26,400