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REVENUE - Contract Assets and Liability (Details) - USD ($)
$ in Millions
 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Oct. 31, 2019
Contract Asset      
Contract Assets (Unbilled Accounts Receivable) $ 150   $ 110
Contract Liability      
Contract liability ending balance as of October 31, 2019 386    
Net revenue deferred in the period 331    
Revenue recognized that was included in the contract liability balance at the beginning of the period (273) $ (230)  
Change in deferrals from customer cash advances, net of revenue recognized 3    
Currency Translation and Other Adjustment 4    
Contract liability ending balance as of April 30, 2020 $ 451