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Associated companies (Details 1) - Roche Holding AG, Switzerland - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]    
Proportion of voting rights held in associate 33.30% 33.30%
Proportion of ownership interest in associate 6.20% 6.20%
Dividends received $ 522  
Gain on divestment of interests in associated companies 14,556  
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations $ 20,700