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Acquisitions (Details 2) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 18,306 $ 17,537 $ 17,516
2019 Acquisitions      
Business Acquisition [Line Items]      
Goodwill 767    
Net tangible assets assumed 239    
Total fair value consideration 1,612    
2019 Acquisitions | Intangible Assets      
Business Acquisition [Line Items]      
Intangible assets 465    
2019 Acquisitions | In-process research and development      
Business Acquisition [Line Items]      
Intangible assets $ 141    
2017 Acquisitions      
Business Acquisition [Line Items]      
Goodwill     1,433
Net tangible assets assumed     334
Total fair value consideration     2,455
2017 Acquisitions | Intangible Assets      
Business Acquisition [Line Items]      
Intangible assets     603
2017 Acquisitions | In-process research and development      
Business Acquisition [Line Items]      
Intangible assets     $ 85