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REVENUE Capitalized Contractual Cost (Details) - USD ($)
$ in Millions
 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Nov. 01, 2018
Capitalized Contract Cost [Line Items]      
Capitalized Contract Cost, Judgment Capitalized incremental costs are allocated to the individual performance obligations in proportion to the transaction price allocated to each performance obligation and amortized based on the pattern of performance for the underlying performance obligation. Contract costs related to initial contracts and renewals are amortized over the same period because the commissions paid on both the initial contract and renewals are commensurate with one another.    
Balance at October 31, 2019 $ 28 $ 0  
Cost capitalized on day1 due to ASC 606 adoption 0   $ 29
Costs capitalized during the period 49 47  
Costs amortized during the period (50) (50)  
Ending balance $ 27 $ 26