REVENUE - Revenue by Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Net revenue	$ 1,525	$ 1,238	$ 3,073	$ 2,595
Instrumentation
Net revenue	632	491	1,313	1,084
Non-Instrumentation and Other
Net revenue	$ 893	$ 747	$ 1,760	$ 1,511