SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,357	$ 1,284
Income from operations	215	250
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	638	607
Income from operations	158	159
Diagnostics and Genomics
Segment Reporting Information
Net revenue	249	235
Income from operations	34	33
Agilent CrossLab
Segment Reporting Information
Net revenue	470	442
Income from operations	119	105
Segment Total
Segment Reporting Information
Net revenue	1,357	1,284
Income from operations	$ 311	$ 297