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Significant transactions (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 08, 2021
May 27, 2020
Jun. 30, 2021
Jun. 30, 2020
Significant Transactions [Line Items]        
Purchase of intangible assets     $ 411 $ 32
Simbrinza        
Significant Transactions [Line Items]        
Purchase of intangible assets $ 355      
Series 2030 notes        
Significant Transactions [Line Items]        
Proceeds from borrowings   $ 750    
Borrowings, interest rate   2.60%