INCOME TAXES INCOME TAXES (Tax incentives) (Details) $ in Millions	6 Months Ended
Apr. 30, 2025 USD ($)
Income Tax Disclosure [Abstract]
Tax incentives, Description	Keysight benefits from tax incentives in several jurisdictions, most significantly in Singapore and Malaysia. The tax incentives provide lower rates of taxation on certain classes of income and require thresholds of investments and employment in those jurisdictions. The Malaysia tax incentive expires October 31, 2025. The Singapore tax incentive expires July 31, 2029. The impact of the tax incentives decreased income taxes by $33 million for the six months ended April 30, 2025.
Decrease in income tax provision due to tax incentives, Aggregate Dollar Amount	$ 33

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

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