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Goodwill and intangible assets (Details 3) - Operating segments [member]
Dec. 31, 2020
Innovative Medicines  
Disclosure of detailed information about intangible assets [line items]  
Terminal Growth Rate 1.50%
Discount Rate (post-tax) 6.50%
Sandoz  
Disclosure of detailed information about intangible assets [line items]  
Terminal Growth Rate 1.50%
Discount Rate (post-tax) 6.50%