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Subsequent event (Details)
shares in Millions, $ in Millions
1 Months Ended 5 Months Ended 9 Months Ended
Jan. 06, 2021
Jan. 07, 2021
clinic
Jul. 31, 2020
USD ($)
clinic
Jan. 07, 2021
USD ($)
Sep. 30, 2021
USD ($)
shares
VillageMD          
Subsequent Event [Line Items]          
Aggregate commitment to acquire equity investments     $ 1,000    
Commitment term     3 years    
Investment period     5 years    
Payments to acquire equity investments     $ 250    
VillageMD | Minimum          
Subsequent Event [Line Items]          
Number of clinics expected to be opened | clinic     500    
VillageMD | Maximum          
Subsequent Event [Line Items]          
Number of clinics expected to be opened | clinic     700    
Discontinued Operations, Disposed of by Sale | Business | Forecast          
Subsequent Event [Line Items]          
Consideration from sale         $ 6,500
Proceeds from sale         $ 6,275
Shares acquired upon sale (in shares) | shares         2
Subsequent Event | VillageMD          
Subsequent Event [Line Items]          
Commitment term   4 years      
Payments to acquire equity investments       $ 750  
Subsequent Event | VillageMD | Minimum          
Subsequent Event [Line Items]          
Number of clinics expected to be opened | clinic   600      
Subsequent Event | VillageMD | Maximum          
Subsequent Event [Line Items]          
Number of clinics expected to be opened | clinic   700      
Subsequent Event | AmerisourceBergen Corporation          
Subsequent Event [Line Items]          
Term of pharmaceutical distribution agreement 3 years