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SEGMENT INFORMATION Profitability (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Segment Reporting Information [Line Items]        
Segment Reporting, Factors Used to Identify Entity's Reportable Segments     Our three 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     Descriptions of our three reportable segments are as follows: The Communications Solutions Group serves customers spanning the worldwide commercial communications end market, which includes internet infrastructure, and the aerospace, defense and government end market. The group provides electronic design and test software, instruments, and systems used in the simulation, design, validation, manufacturing, installation and optimization of electronic equipment. The Electronic Industrial Solutions Group provides test and measurement solutions across a broad set of industries within the electronic industrial end market, focusing on high-growth applications in the automotive and energy industry and measurement solutions for semiconductor design and manufacturing, consumer electronics, education and general electronics manufacturing. The group provides electronic design and test software, instruments, and systems used in the simulation, design, validation, manufacturing, installation and optimization of electronic equipment. The Services Solutions Group provides repair, calibration and consulting services, and remarkets used Keysight equipment. In addition to providing repair and calibration support for Keysight equipment, we also calibrate non-Keysight equipment. The group serves the same markets as Keysight’s Communications Solutions and Electronic Industrial Solutions Groups, providing industry-specific services to deliver complete Keysight solutions and help customers reduce their total cost of ownership for their design and test equipment.  
Number of Operating Segments     3  
Number of Reportable Segments     3  
Business Combination Acquisition Related Fair Value Adjustments $ (3) $ 0 $ (12) $ 0
Total net revenue 715 665 2,167 2,106
Segment income from operations 106 100 299 320
Communications Solutions Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 424   1,310  
Business Combination Acquisition Related Fair Value Adjustments (3)   (12)  
Total net revenue 421 389 1,298 1,250
Segment income from operations 77 72 239 240
Electronic Industrial Solutions Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 191   575  
Business Combination Acquisition Related Fair Value Adjustments 0   0  
Total net revenue 191 175 575 558
Segment income from operations 44 32 122 110
Services Solutions Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 103   294  
Business Combination Acquisition Related Fair Value Adjustments 0   0  
Total net revenue 103 101 294 298
Segment income from operations 19 20 43 52
Total        
Segment Reporting Information [Line Items]        
Revenues 718   2,179  
Business Combination Acquisition Related Fair Value Adjustments (3)   (12)  
Total net revenue 715 665 2,167 2,106
Segment income from operations $ 140 $ 124 $ 404 $ 402