SEGMENT INFORMATION (General) (Details)	12 Months Ended
Oct. 31, 2019
Segment Reporting [Abstract]
Number of Reportable Segments	3
Segment Reporting, Factors Used to Identify Entity's Reportable Segments	Our operating segments were determined based primarily on how the chief operating decision maker views and evaluates our operations. Segment operating results are regularly reviewed by the chief operating decision maker to make decisions about resources to be allocated to each segment and to assess performance. Other factors, including market separation and customer specific applications, go-to-market channels, products and services and manufacturing are considered in determining the formation of these operating segments.
Segment Reporting, Additional Information about Entity's Reportable Segments	The Communications Solutions Group serves customers spanning the worldwide commercial communications and aerospace, defense and government end markets. The group provides electronic design and test software, instruments, systems and related services used in the simulation, design, validation, manufacturing, installation and optimization of electronic equipment. The Electronic Industrial Solutions Group provides test and measurement solutions and related services across a broad set of electronic industrial end markets, focusing on high-value applications in the automotive and energy industry and measurement solutions for consumer electronics, education, general electronics design and manufacturing, and semiconductor design and manufacturing. The group provides electronic design and test software, instruments and systems and related services used in the simulation, design, validation, manufacturing, installation and optimization of electronic equipment. The Ixia Solutions Group helps customers design, validate and optimize the performance and security resilience of their networks and associated components and applications. Network test, network visibility and security solutions help organizations and their customers strengthen their physical and virtual networks. The group’s solutions consist of software applications and services, including warranty and maintenance offerings, and high-performance hardware platforms.
Description of Effect on Previously Reported Segment Information for Change in Composition of Reportable Segments	In 2019 we completed an organizational change to align our services business with our customer-solutions-oriented, go-to-market strategy as reflected by our Keysight Leadership Model ("KLM"). This change was made to fully reflect our services delivery within the markets served and further enable the growth of our services solutions portfolio. Prior period segment results were revised to conform to the presentation. As a result, Keysight has three segments: Communications Solutions Group, Electronic Industrial Solutions Group and Ixia Solutions Group. The organizational structure continues to include centralized enterprise functions that provide support across the groups.

SEGMENT INFORMATION (General) (Details)

12 Months Ended

Oct. 31, 2019

Segment Reporting, Factors Used to Identify Entity's Reportable Segments

Our operating segments were determined based primarily on how the chief operating decision maker views and evaluates our operations. Segment operating results are regularly reviewed by the chief operating decision maker to make decisions about resources to be allocated to each segment and to assess performance. Other factors, including market separation and customer specific applications, go-to-market channels, products and services and manufacturing are considered in determining the formation of these operating segments.

Segment Reporting, Additional Information about Entity's Reportable Segments

The Communications Solutions Group serves customers spanning the worldwide commercial communications and aerospace, defense and government end markets. The group provides electronic design and test software, instruments, systems and related services used in the simulation, design, validation, manufacturing, installation and optimization of electronic equipment. The Electronic Industrial Solutions Group provides test and measurement solutions and related services across a broad set of electronic industrial end markets, focusing on high-value applications in the automotive and energy industry and measurement solutions for consumer electronics, education, general electronics design and manufacturing, and semiconductor design and manufacturing. The group provides electronic design and test software, instruments and systems and related services used in the simulation, design, validation, manufacturing, installation and optimization of electronic equipment. The Ixia Solutions Group helps customers design, validate and optimize the performance and security resilience of their networks and associated components and applications. Network test, network visibility and security solutions help organizations and their customers strengthen their physical and virtual networks. The group’s solutions consist of software applications and services, including warranty and maintenance offerings, and high-performance hardware platforms.

Description of Effect on Previously Reported Segment Information for Change in Composition of Reportable Segments

In 2019 we completed an organizational change to align our services business with our customer-solutions-oriented, go-to-market strategy as reflected by our Keysight Leadership Model ("KLM"). This change was made to fully reflect our services delivery within the markets served and further enable the growth of our services solutions portfolio. Prior period segment results were revised to conform to the presentation. As a result, Keysight has three segments: Communications Solutions Group, Electronic Industrial Solutions Group and Ixia Solutions Group. The organizational structure continues to include centralized enterprise functions that provide support across the groups.