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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 29, 2020
Nov. 01, 2020
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Innovation Associates, Inc.            
Business Acquisition [Line Items]            
Cash consideration $ 451          
McKesson Corporation, GEHE Pharma Handel            
Business Acquisition [Line Items]            
Controlling interest percentage   70.00%        
Noncash purchase consideration   $ 296        
Other Acquisitions            
Business Acquisition [Line Items]            
Cash consideration     $ 19 $ 27 $ 85 $ 166