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Associated companies (Details 3) - Roche Holding AG, Switzerland - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]      
Proportion of voting rights held in associate 33.30% 33.30% 33.30%
Proportion of ownership interest in associate 6.20% 6.20% 6.20%
Dividends received $ 487 $ 460  
Publicly quoted market value of the Novartis interest $ 18,800 $ 16,900  
Useful life measured as period of time, intangible assets other than goodwill 20 years