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Acquisitions - summary of identified assets acquired and liabilities assumed (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2018
Identifiable assets acquired and liabilities assumed      
Goodwill $ 16,560 $ 15,268 $ 16,914
Rite Aid Corporation      
Business Acquisition [Line Items]      
Consideration 4,330    
Identifiable assets acquired and liabilities assumed      
Inventories 1,171    
Property, plant and equipment 490    
Intangible assets 2,039    
Accrued expenses and other liabilities (55)    
Deferred income taxes 291    
Other non-current liabilities (937)    
Total identifiable net assets 2,999    
Goodwill $ 1,331