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Depreciation and Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Dec. 31, 2014
Depreciation and Amortization [Abstract]      
Depreciation expense $ 298 $ 256  
Intangible asset and other amortization 84 63  
Total depreciation and amortization expense $ 382 $ 319  
Business Acquisition [Line Items]      
Ownership percentage 45.00%    
Alliance Boots [Member]      
Business Acquisition [Line Items]      
Remaining ownership percentage     55.00%
Ownership percentage 45.00%   100.00%
Alliance Boots [Member] | Previously Reported [Member]      
Business Acquisition [Line Items]      
Ownership percentage 45.00%   45.00%