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SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,274	$ 1,203	$ 3,796	$ 3,620
Income from operations	225	221	691	660
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	544	540	1,680	1,673
Income from operations	118	122	384	389
Diagnostics and Genomics
Segment Reporting Information
Net revenue	263	237	752	687
Income from operations	50	43	132	115
Agilent CrossLab
Segment Reporting Information
Net revenue	467	426	1,364	1,260
Income from operations	122	98	342	281
Segment Total
Segment Reporting Information
Net revenue	1,274	1,203	3,796	3,620
Income from operations	$ 290	$ 263	$ 858	$ 785

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The net result for the period of deducting operating expenses from operating revenues.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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