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Divestiture (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2016
Oct. 31, 2015
Acquisitions      
Goodwill $ 5,672 $ 5,672 $ 5,680
Divestitures      
Proceeds from business divestitures   $ 61  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Divestiture of software assets      
Divestitures      
Proceeds from divestiture of certain software assets $ 170