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Acquisitions - Schedule of Aggregate Purchase Price Allocation Including Preliminary Allocation (Details) - USD ($)
$ in Millions
Jul. 31, 2017
Oct. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 25,491 $ 24,178
Q2 2017 YTD Acquisitions    
Business Acquisition [Line Items]    
Goodwill 1,313  
Net assets assumed 322  
Total fair value consideration 2,302  
Q2 2017 YTD Acquisitions | Amortizable intangible assets    
Business Acquisition [Line Items]    
Amortizable intangible assets 582  
Q2 2017 YTD Acquisitions | In-process research and development    
Business Acquisition [Line Items]    
Amortizable intangible assets $ 85