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SHARE-BASED COMPENSATION Allocated Share-based compensation expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense $ 18 $ 16 $ 45 $ 40
Cost of Products and Services        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense 5 4 11 9
Research and Development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense 2 2 5 4
Selling, General and Administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense $ 11 $ 10 $ 29 $ 27