REVENUE - Revenue by End Markets (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
Pharmaceutical and Biopharmaceutical
Net revenue	531	400	1,052	823
Chemical and Energy
Net revenue	314	267	642	579
Diagnostics and Clinical
Net revenue	233	200	449	394
Food
Net revenue	144	114	306	244
Academia and Government
Net revenue	143	115	285	256
Environmental and Forensics
Net revenue	$ 160	$ 142	$ 339	$ 299