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Supplemental information - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 24, 2021
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
Nov. 23, 2021
Increase (Decrease) in Temporary Equity [Roll Forward]            
Beginning balance   $ 157 $ 2,787 $ 1,042 $ 319  
Recognition of acquisition of subsidiary   0 0 0 2,489  
Acquisitions of non-controlling interests   0 (2,047) 0 (2,047)  
Net loss attributable to Redeemable non-controlling interests   (1) (12) (24) (33)  
Redemption price adjustments   0 83 440 90  
Reclassifications from redeemable non-controlling interests   0 0 (1,314) 0  
Other   3 2 14 (6)  
Ending balance   158 812 158 812  
Conversion of Stock [Line Items]            
Acquisitions of non-controlling interests   $ 0 (2,047) $ 0 (2,047)  
VillageMD            
Increase (Decrease) in Temporary Equity [Roll Forward]            
Acquisitions of non-controlling interests     1,900   1,900  
Conversion of Stock [Line Items]            
Acquisitions of non-controlling interests     $ 1,900   $ 1,900  
Value of purchase tender offer $ 1,900          
Outstanding equity interest percentage 63.00%         30.00%
McKesson Corporation, GEHE Pharma Handel            
Conversion of Stock [Line Items]            
Outstanding equity interest percentage     30.00%   30.00%