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Acquisitions - narrative (Details)
$ / shares in Units, £ in Millions
12 Months Ended
Sep. 19, 2017
USD ($)
store
distribution_center
Jan. 01, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
segment
$ / shares
shares
Dec. 31, 2014
GBP (£)
segment
shares
Aug. 31, 2017
USD ($)
segment
shares
Aug. 31, 2015
USD ($)
Jun. 28, 2017
store
distribution_center
Aug. 31, 2016
USD ($)
shares
Business Acquisition [Line Items]                
Purchase price consideration (in shares) | shares         1,172,513,618     1,172,513,618
Goodwill         $ 15,632,000,000 $ 16,372,000,000   $ 15,527,000,000
Number of reportable segments | segment     3 3 3      
Rite Aid                
Business Acquisition [Line Items]                
Number of stores expected to be acquired | store             2,186  
Number of distribution centers expected to be acquired | distribution_center             3  
Alliance Boots                
Business Acquisition [Line Items]                
Percentage of issued and outstanding capital acquired     55.00%          
Ownership interest (as a percent)     100.00%          
Total consideration     $ 15,851,000,000          
Total purchase price cash consideration     $ 4,874,000,000 £ 3,133        
Spot rate (in usd per gbp)     1.56          
Purchase price consideration(in shares) | shares     144,300,000 144,300,000        
Common stock at fair value     $ 10,977,000,000          
Closing market price per share (in dollars per share) | $ / shares     $ 76.05          
Net consideration transferred     $ 13,292,000,000          
Consideration attributed to WBAD     2,559,000,000          
Remeasurement gain           563,000,000    
Fair value of the investment in Alliance Boots held before the Second Step Transaction     8,149,000,000          
Goodwill     14,861,000,000          
Legal and professional fees incurred           $ 87,000,000    
Fair value of assets acquired     3,700,000,000          
Estimated manufacturing profit in acquired finished goods inventory capitalized     $ 106,000,000          
Walgreens Boots Alliance Development GmbH                
Business Acquisition [Line Items]                
Ownership interest (as a percent)     100.00%          
Ownership interest prior to step transaction (as a percent)     50.00%          
Noncontrolling interest (as a percent)     27.50%          
Equity method ownership option to repurchase shares, amount   $ 100,000            
Alliance Healthcare Italia Distribuzione S.p.A.                
Business Acquisition [Line Items]                
Equity interest in Alliance Boots   5.00%            
Purchase price consideration (in shares) | shares   320            
Previously Reported | Alliance Boots                
Business Acquisition [Line Items]                
Equity interest in Alliance Boots     45.00%          
Subsequent Event | Rite Aid                
Business Acquisition [Line Items]                
Number of stores expected to be acquired | store 1,932              
Number of distribution centers expected to be acquired | distribution_center 3              
Total consideration to be transferred $ 4,375,000,000              
Retail Pharmacy USA | Alliance Boots                
Business Acquisition [Line Items]                
Goodwill     $ 7,300,000,000          
Goodwill arising from synergies     3,500,000,000          
Goodwill based on a with and without analysis     3,800,000,000          
Retail Pharmacy International | Alliance Boots                
Business Acquisition [Line Items]                
Goodwill     3,900,000,000          
Pharmaceutical Wholesale | Alliance Boots                
Business Acquisition [Line Items]                
Goodwill     $ 3,700,000,000