SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,525	$ 1,238	$ 3,073	$ 2,595
Income from operations	288	102	616	317
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	674	526	1,396	1,164
Income from operations	154	98	353	256
Diagnostics and Genomics
Segment Reporting Information
Net revenue	315	263	609	512
Income from operations	69	57	124	91
Agilent CrossLab
Segment Reporting Information
Net revenue	536	449	1,068	919
Income from operations	141	122	283	241
Segment Total
Segment Reporting Information
Net revenue	1,525	1,238	3,073	2,595
Income from operations	$ 364	$ 277	$ 760	$ 588