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SHARE-BASED COMPENSATION (Allocation of period costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Share-based Compensation Expense, Allocation of Recognized Period Costs [Line Items]        
Share-based Compensation Expense $ 19 $ 16 $ 73 $ 66
Cost of products and services        
Share-based Compensation Expense, Allocation of Recognized Period Costs [Line Items]        
Share-based Compensation Expense 4 2 13 11
Research and development        
Share-based Compensation Expense, Allocation of Recognized Period Costs [Line Items]        
Share-based Compensation Expense 4 4 15 13
Selling, general and administrative        
Share-based Compensation Expense, Allocation of Recognized Period Costs [Line Items]        
Share-based Compensation Expense $ 11 $ 10 $ 45 $ 42