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REVENUE - Revenue by Region (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Disaggregation of Revenue [Line Items]
Net revenue	$ 5,339	$ 5,163	$ 4,914
Americas
Disaggregation of Revenue [Line Items]
Net revenue	1,968	1,861
Europe
Disaggregation of Revenue [Line Items]
Net revenue	1,443	1,441
Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	1,928	1,861
Life Sciences and Applied Markets
Disaggregation of Revenue [Line Items]
Net revenue	2,392	2,302	2,270
Life Sciences and Applied Markets | Americas
Disaggregation of Revenue [Line Items]
Net revenue	784	692
Life Sciences and Applied Markets | Europe
Disaggregation of Revenue [Line Items]
Net revenue	540	551
Life Sciences and Applied Markets | Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	1,068	1,059
Diagnostics and Genomics
Disaggregation of Revenue [Line Items]
Net revenue	1,047	1,021	943
Diagnostics and Genomics | Americas
Disaggregation of Revenue [Line Items]
Net revenue	517	505
Diagnostics and Genomics | Europe
Disaggregation of Revenue [Line Items]
Net revenue	371	368
Diagnostics and Genomics | Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	159	148
Agilent CrossLab
Disaggregation of Revenue [Line Items]
Net revenue	1,900	1,840	$ 1,701
Agilent CrossLab | Americas
Disaggregation of Revenue [Line Items]
Net revenue	667	664
Agilent CrossLab | Europe
Disaggregation of Revenue [Line Items]
Net revenue	532	522
Agilent CrossLab | Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenue	$ 701	$ 654

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