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REVENUE Contract cost (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Nov. 01, 2019
Nov. 01, 2018
Capitalized Contract Cost [Line Items]        
Balance at beginning of period $ 28 $ 0    
Costs capitalized on November 1, 2018 due to ASC 606 adoption     $ 0 $ 29
Costs capitalized during the period 86 63    
Costs amortized during the period (83) (64)    
Balance at end of period $ 31 $ 28