SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended
	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,548	$ 1,357
Income from operations	328	215
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	722	638
Income from operations	199	158
Diagnostics and Genomics
Segment Reporting Information
Net revenue	294	249
Income from operations	55	34
Agilent CrossLab
Segment Reporting Information
Net revenue	532	470
Income from operations	142	119
Segment Total
Segment Reporting Information
Net revenue	1,548	1,357
Income from operations	$ 396	$ 311