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Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2015
USD ($)
organization
Segments
Reportable_Segments
$ / shares
Jun. 30, 2014
USD ($)
Segments
Reportable_Segments
investment
$ / shares
Jun. 30, 2013
USD ($)
$ / shares
Jun. 30, 2012
USD ($)
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Valuation allowance [1] $ 455 $ 429 $ 443 $ 143
Finance notes and related accrued interest, net, total 161 158    
Finance notes and related accrued interest, net, current $ 53 $ 51    
Largest group purchasing organizations | organization 2      
Portion of inventories held at LIFO, percentage 58.00% 61.00%    
Inventories valued at LIFO amount higher than average cost value $ 114 $ 98    
Reserves for excess and obsolete inventory 57 44    
Depreciation $ 254 $ 265 269  
Interest rate on long-term projects (approximates weighted-average on long-term obligations) 2.54%      
Number of operating segments | Segments 2 2    
Number of reportable segments | Reportable_Segments 2 2    
Goodwill impairment $ 829 $ 829 829  
Number of other investments sold | investment   2    
Proceeds from sale of investments   $ 47    
Gain on sale of investments 5 32 0  
Gain on sale of investment, net of tax   20    
Investments in fixed income corporate debt securities, classified as held-to-maturity     $ 72  
Vendor reserves $ 88 $ 82    
Cash dividends per common share | $ / shares $ 1.37 $ 1.21 $ 1.025  
Sales returns and allowances $ 2,000 $ 1,700 $ 2,300  
Shipping and handling costs 454 430 419  
Allowance for Accounts Receivable        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Valuation allowance [1] 135 137 134 126
Allowance for Finance Notes Receivable        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Valuation allowance [1] 14 18 17 16
Allowance Sales Returns and Allowances        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Valuation allowance [1],[2] $ 305 $ 273 291 $ 0
Minimum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Receivable financing agreement term 270 days      
Fair value discount rate, reporting unit valuations 8.50%      
Maximum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Receivable financing agreement term 5 years      
Fair value discount rate, reporting unit valuations 11.00%      
Nuclear Pharmacy Services Division        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Goodwill impairment     829  
Goodwill impairment, net of tax     $ 799  
Walgreen Co | Pharmaceutical        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Revenue, major customer, percentage 0.00% 4.00% 20.00%  
Group Purchasing Organizations        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Revenue, major customer, percentage 18.00% 17.00% 13.00%  
Building and Improvements | Minimum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Useful life of property and equipment 3 years      
Building and Improvements | Maximum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Useful life of property and equipment 39 years      
Machinery and Equipment | Minimum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Useful life of property and equipment 3 years      
Machinery and Equipment | Maximum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Useful life of property and equipment 20 years      
Furniture and Fixtures | Minimum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Useful life of property and equipment 3 years      
Furniture and Fixtures | Maximum        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Useful life of property and equipment 7 years      
[1] Amounts included herein pertain to the continuing operations of the Company.
[2] Effective June 30, 2013, we prospectively updated our policy to accrue for estimated sales returns and allowances at the time of sale based upon historical customer return trends, margin rates and processing costs. Prior to this change in policy, we recognized sales returns as a reduction of revenue and cost of products sold for the sales price and cost, respectively, when products were returned.