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Related parties - Narrative (Details) - USD ($)
$ in Millions
Dec. 28, 2021
Nov. 24, 2021
Affiliated Entity | Steve Shulman | VillageMD    
Related Party Transaction [Line Items]    
Percentage of outstanding shares owned 1.20%  
VillageMD    
Related Party Transaction [Line Items]    
Value of purchase tender offer   $ 1,900
VillageMD | Affiliated Entity    
Related Party Transaction [Line Items]    
Value of purchase tender offer $ 1,900  
Payments for stock consideration $ 117  
Number of shares tendered (in shares) 287,781