REVENUE - Revenue by Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Net revenue	$ 1,261	$ 1,274	$ 3,856	$ 3,796
Instrumentation
Net revenue	526	505	1,610	1,563
Non-Instrumentation and Other
Net revenue	$ 735	$ 769	$ 2,246	$ 2,233