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SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)	Jul. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,586	$ 1,261	$ 4,659	$ 3,856
Income from operations	336	230	952	547
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	680	557	2,076	1,721
Income from operations	170	126	523	382
Diagnostics and Genomics
Segment Reporting Information
Net revenue	346	241	955	753
Income from operations	78	41	202	132
Agilent CrossLab
Segment Reporting Information
Net revenue	560	463	1,628	1,382
Income from operations	164	132	447	373
Segment Total
Segment Reporting Information
Net revenue	1,586	1,261	4,659	3,856
Income from operations	$ 412	$ 299	$ 1,172	$ 887

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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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