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Associated companies (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]    
Balance sheet value $ 9,632 $ 8,644
Roche Holding AG, Switzerland    
Disclosure of associates [line items]    
Novartis share of estimated net assets 2,585  
Novartis share of re-appraised intangible assets 117  
Implicit Novartis goodwill 3,233  
Current value of share in net identifiable assets and goodwill 5,935  
Accumulated equity accounting adjustments and translation effects less dividends received 3,472  
Balance sheet value $ 9,407 $ 8,445