SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,238	$ 1,238	$ 2,595	$ 2,522
Income from operations	102	216	317	466
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	526	529	1,164	1,136
Income from operations	98	107	256	266
Diagnostics and Genomics
Segment Reporting Information
Net revenue	263	254	512	489
Income from operations	57	49	91	82
Agilent CrossLab
Segment Reporting Information
Net revenue	449	455	919	897
Income from operations	122	115	241	220
Segment Total
Segment Reporting Information
Net revenue	1,238	1,238	2,595	2,522
Income from operations	$ 277	$ 271	$ 588	$ 568