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Subsequent events (Details) - USD ($)
$ in Millions
Oct. 11, 2022
Sep. 20, 2022
Aug. 31, 2022
Oct. 29, 2021
Oct. 28, 2021
Shields Health Solutions          
Subsequent Event [Line Items]          
Outstanding equity interest percentage       70.00% 25.00%
Shields Health Solutions | Subsequent event          
Subsequent Event [Line Items]          
Outstanding equity interest percentage   30.00%      
Total purchase price   $ 1,370      
CareCentrix, Inc.          
Subsequent Event [Line Items]          
Outstanding equity interest percentage     55.00%    
CareCentrix, Inc. | Subsequent event          
Subsequent Event [Line Items]          
Outstanding equity interest percentage 45.00%        
Total purchase price $ 392