SHARE-BASED COMPENSATION Allocated Share-based compensation expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 19	$ 18	$ 64	$ 58
Cost of Products and Services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	5	4	16	13
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	2	2	7	6
Selling, General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 12	$ 12	$ 41	$ 39