REVENUE- Revenue by Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Net revenue	$ 1,525	$ 1,238	$ 3,073	$ 2,595
Life Sciences and Applied Markets
Net revenue	674	526	1,396	1,164
Agilent CrossLab
Net revenue	536	449	1,068	919
Diagnostics and Genomics
Net revenue	315	263	609	512
Americas
Net revenue	581	457	1,136	951
Americas | Life Sciences and Applied Markets
Net revenue	231	170	455	379
Americas | Agilent CrossLab
Net revenue	187	161	366	328
Americas | Diagnostics and Genomics
Net revenue	163	126	315	244
Europe
Net revenue	415	334	852	726
Europe | Life Sciences and Applied Markets
Net revenue	155	111	345	278
Europe | Agilent CrossLab
Net revenue	154	131	301	264
Europe | Diagnostics and Genomics
Net revenue	106	92	206	184
Asia Pacific
Net revenue	529	447	1,085	918
Asia Pacific | Life Sciences and Applied Markets
Net revenue	288	245	596	507
Asia Pacific | Agilent CrossLab
Net revenue	195	157	401	327
Asia Pacific | Diagnostics and Genomics
Net revenue	$ 46	$ 45	$ 88	$ 84