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Acquisitions - Schedule of consideration (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Nov. 30, 2017
Aug. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 15,931 $ 15,632
AllianceRx Walgreens Prime      
Business Acquisition [Line Items]      
Total consideration $ 720    
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