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REVENUE Contract liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 14, 2019
Oct. 31, 2020
Revenue from Contract with Customer [Abstract]    
Balance at October 31, 2019   $ 510
Deferral of revenue billed in current period, net of recognition   377
Deferred revenue arising out of acquisitions $ 10  
Revenue recognized that was deferred as of the beginning of the period   (336)
Foreign Currency Exchange Rate, Translation   5
Capitalized Contract Cost [Line Items]    
Balance at October 31, 2020   $ 566