REVENUE - Revenue by End Markets (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
Pharmaceutical and Biopharmaceutical
Net revenue	440	416	1,263	1,178
Chemical and Energy
Net revenue	260	291	839	899
Diagnostics and Clinical
Net revenue	178	198	572	578
Food
Net revenue	123	116	367	359
Academia and Government
Net revenue	119	103	375	333
Environmental and Forensics
Net revenue	$ 141	$ 150	$ 440	$ 449