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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 29, 2020
Nov. 01, 2020
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Innovation Associates            
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     $ 28 $ 60 $ 66 $ 140