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Intangible assets - Summary of impairment charges (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Impairment of intangible assets      
Impairment charges $ 55 $ 119  
Carrying value 20,006 19,728 $ 20,947
Launched products      
Impairment of intangible assets      
Impairment charges 0 85  
Products in development      
Impairment of intangible assets      
Impairment charges $ 55 $ 34