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Segmentation of key figures (Details 11) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Profit sharing income $ 835 $ 734 $ 877
Royalty income 300 147 188
Milestone income 50 231 173
Other 54 67 28
Other revenues 1,239 1,179 1,266
Innovative Medicines      
Disclosure of operating segments [line items]      
Profit sharing income 835 732 874
Royalty income 107 104 162
Milestone income 39 201 128
Other 37 55 24
Sandoz      
Disclosure of operating segments [line items]      
Profit sharing income 0 2 3
Royalty income 25 19 10
Milestone income 11 30 45
Other 17 12 4
Corporate      
Disclosure of operating segments [line items]      
Royalty income 168 24 16
Operating segments [member] | Innovative Medicines      
Disclosure of operating segments [line items]      
Other revenues 1,018 1,092 1,188
Operating segments [member] | Sandoz      
Disclosure of operating segments [line items]      
Other revenues 53 63 62
Operating segments [member] | Corporate      
Disclosure of operating segments [line items]      
Other revenues $ 168 $ 24 $ 16