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Acquisitions and Divestitures (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 01, 2017
Oct. 31, 2016
Oct. 31, 2018
Oct. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]        
Goodwill $ 339 $ 5,622 $ 5,968 $ 5,622
Amortizable intangible assets 521      
Net assets assumed 191      
Total fair value of consideration $ 1,051      
Divestiture | Open Text Corporation        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration to divest   475    
Gain recognized   $ 401