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Acquisitions (Details)
$ / shares in Units, £ in Millions
9 Months Ended
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2014
GBP (£)
shares
May. 31, 2015
USD ($)
shares
Jan. 01, 2015
Dec. 30, 2014
$ / shares
Aug. 31, 2014
USD ($)
shares
Business Acquisition [Line Items]            
Equity method investment ownership interest percentage (in hundredths)     45.00%      
Common shares transfer (in shares) | shares     1,172,513,618     1,028,180,150
Total purchase price $ 15,900,000,000   $ 13,300,000,000      
Noncontrolling interest acquired     366,000,000     $ 104,000,000
Total purchase price cash consideration $ 4,900,000,000 £ 3,133        
Spot rate 1.56 1.56        
Purchase price consideration, common shares (in shares) | shares 144,300,000 144,300,000        
Purchase price consideration common shares fair value $ 11,000,000,000          
Closing market price per share (in dollars per share) | $ / shares         $ 76.05  
Alliance Boots [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Percentage of issued and outstanding capital acquired (in hundredths) 55.00% 55.00%        
Equity method investment ownership interest percentage (in hundredths) 100.00% 100.00%        
Total purchase price     15,851,000,000      
Total purchase price cash consideration     4,874,000,000      
Purchase price consideration common shares fair value     8,293,000,000      
Preliminary impact of equity transactions [Abstract]            
Consideration attributable to WBAD     2,569,000,000      
Less: Carrying value of the Company's pre-existing noncontrolling interest     130,000,000      
Impact to additional paid in capital     $ 2,439,000,000      
Alliance Boots [Member] | Previously Reported [Member]            
Business Acquisition [Line Items]            
Equity method investment ownership interest percentage (in hundredths) 45.00% 45.00% 45.00%      
Walgreens Boots Alliance Development GmbH [Member]            
Business Acquisition [Line Items]            
Equity method investment ownership interest percentage (in hundredths)     100.00%      
Ownership interest percentage prior to Second Step Transaction (in hundredths)     50.00%      
Noncontrolling interest (in hundredths)     27.50%      
Equity method ownership option to repurchase shares, amount     $ 100,000      
Noncontrolling interest acquired     $ 2,600,000,000      
Alliance Healthcare Italia Distribuzione S.p.A. [Member]            
Business Acquisition [Line Items]            
Equity method investment ownership interest percentage (in hundredths)       5.00%    
Common shares transfer (in shares) | shares     320