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Associated companies (Details 4) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]        
Current assets   $ 29,673 $ 29,504  
Non-current assets   102,386 88,866  
Current liabilities   33,059 28,264  
Non-current liabilities   42,334 34,555  
Profit (loss)   8,071 11,737 $ 12,614
Other comprehensive income   3,330 (210) (406)
Comprehensive income   $ 11,401 11,527 $ 12,208
Roche Holding AG, Switzerland        
Disclosure of associates [line items]        
Current assets $ 27,700   31,300  
Non-current assets 55,700   56,400  
Current liabilities 22,500   24,100  
Non-current liabilities 23,100   23,100  
Revenue 30,400   63,800  
Profit (loss) 7,200   12,300  
Other comprehensive income (700)   (900)  
Comprehensive income $ 6,500   $ 11,400