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Depreciation and Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Dec. 31, 2014
Depreciation and Amortization [Abstract]          
Depreciation expense $ 339 $ 267 $ 906 $ 787  
Intangible asset and other amortization 99 71 358 214  
Total depreciation and amortization expense $ 438 $ 338 $ 1,264 $ 1,001  
Business Acquisition [Line Items]          
Ownership percentage (in hundredths) 45.00%   45.00%    
Depreciation and amortization expense included in inventory fair value adjustment $ 106   $ 106    
Alliance Boots [Member]          
Business Acquisition [Line Items]          
Remaining ownership percentage (in hundredths)         55.00%
Ownership percentage (in hundredths)         100.00%
Depreciation and amortization expense included in inventory fair value adjustment $ 106   $ 106    
Alliance Boots [Member] | Previously Reported [Member]          
Business Acquisition [Line Items]          
Ownership percentage (in hundredths) 45.00%   45.00%   45.00%