REVENUE - Revenue by Region (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023
Disaggregation of Revenue [Line Items]
Net revenue	$ 6,948	$ 6,510	$ 6,833
Americas
Disaggregation of Revenue [Line Items]
Net revenue	2,806	2,573	2,732
Europe
Disaggregation of Revenue [Line Items]
Net revenue	1,923	1,770	1,754
Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	2,219	2,167	2,347
Life Sciences and Diagnostics Markets
Disaggregation of Revenue [Line Items]
Net revenue	2,726	2,466	2,780
Life Sciences and Diagnostics Markets | Americas
Disaggregation of Revenue [Line Items]
Net revenue	1,337	1,157	1,333
Life Sciences and Diagnostics Markets | Europe
Disaggregation of Revenue [Line Items]
Net revenue	786	723	729
Life Sciences and Diagnostics Markets | Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	603	586	718
Agilent CrossLab
Disaggregation of Revenue [Line Items]
Net revenue	2,908	2,747	2,656
Agilent CrossLab | Americas
Disaggregation of Revenue [Line Items]
Net revenue	1,095	1,048	1,003
Agilent CrossLab | Europe
Disaggregation of Revenue [Line Items]
Net revenue	811	741	701
Agilent CrossLab | Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	1,002	958	952
Applied Markets
Disaggregation of Revenue [Line Items]
Net revenue	1,314	1,297	1,397
Applied Markets | Americas
Disaggregation of Revenue [Line Items]
Net revenue	374	368	396
Applied Markets | Europe
Disaggregation of Revenue [Line Items]
Net revenue	326	306	324
Applied Markets | Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	$ 614	$ 623	$ 677