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SHARE-BASED COMPENSATION Allocated Share-based compensation expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense $ 27 $ 18 $ 67 $ 45
Cost of Products and Services        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense 6 5 15 11
Research and Development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense 2 2 6 5
Selling, General and Administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs        
Share-based compensation expense $ 19 $ 11 $ 46 $ 29