SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,261	$ 1,274	$ 3,856	$ 3,796
Income from operations	230	225	547	691
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	557	544	1,721	1,680
Income from operations	126	118	382	384
Diagnostics and Genomics
Segment Reporting Information
Net revenue	241	263	753	752
Income from operations	41	50	132	132
Agilent CrossLab
Segment Reporting Information
Net revenue	463	467	1,382	1,364
Income from operations	132	122	373	342
Segment Total
Segment Reporting Information
Net revenue	1,261	1,274	3,856	3,796
Income from operations	$ 299	$ 290	$ 887	$ 858