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Acquisitions - summary of identified assets acquired and liabilities assumed (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 19, 2017
Mar. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Identifiable assets acquired and liabilities assumed          
Goodwill     $ 16,914 $ 15,632 $ 15,527
Rite Aid          
Business Acquisition [Line Items]          
Consideration $ 4,330   $ 4,157    
Identifiable assets acquired and liabilities assumed          
Inventories 1,171        
Property, plant and equipment 490        
Intangible assets 2,054        
Accrued expenses and other liabilities (54)        
Deferred income taxes 285        
Other non-current liabilities (960)        
Total identifiable net assets 2,986        
Goodwill $ 1,344        
AllianceRx Walgreens Prime          
Business Acquisition [Line Items]          
Total consideration   $ 720      
Identifiable assets acquired and liabilities assumed          
Accounts receivable   217      
Inventories   149      
Property, plant and equipment   11      
Intangible assets   331      
Trade accounts payable   (90)      
Accrued expenses and other liabilities   (1)      
Total identifiable net assets   617      
Goodwill   $ 103