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Acquisitions - narrative (Details)
$ in Millions
12 Months Ended
Aug. 31, 2020
USD ($)
distribution_center
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
store
Business Acquisition [Line Items]      
Goodwill $ 15,268 $ 16,560 $ 16,914
Rite Aid Corporation      
Business Acquisition [Line Items]      
Number of distribution centers expected to be acquired | distribution_center 3    
Number of stores acquired | store     1,932
Consideration     $ 4,157
Goodwill   1,331  
Rite Aid Corporation - Second And Third Distribution Center      
Business Acquisition [Line Items]      
Number of distribution centers acquired | distribution_center 2    
Payments to acquire business $ 91    
Rite Aid Corporation - First Distribution Center      
Business Acquisition [Line Items]      
Payments to acquire business   61  
Retail Pharmacy USA      
Business Acquisition [Line Items]      
Payments to acquire business $ 258 $ 304