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Document And Entity Information - USD ($)
$ in Billions
 12 Months Ended
Oct. 31, 2015
Dec. 14, 2015
Apr. 30, 2015
Document and Entity Information [Abstract]      
Entity Registrant Name Keysight Technologies, Inc.    
Entity Central Index Key 0001601046    
Current Fiscal Year End Date --10-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 4
Entity Common Stock, Shares Outstanding   170,850,543  
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Oct. 31, 2015