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INCOME TAXES (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Income Tax Examination [Line Items]        
Income Tax Expense (Benefit) $ 6 $ 17 $ 25 $ 51
Other Information Pertaining to Income Taxes     The decrease in effective tax rate and income tax expense from the three and nine months ended July 31, 2015 to the three and nine months ended July 31, 2016 is primarily related to the repatriation of cash to the U.S. and the corresponding realization of foreign tax credits.  
Income Tax Holiday, Aggregate Dollar Amount $ 10 $ 10 $ 27 $ 31
Income Tax Holiday, Income Tax Benefits Per Share $ 0.06 $ 0.06 $ 0.16 $ 0.18
Majority of company's entities [Member]        
Income Tax Examination [Line Items]        
Open Tax Year     2014  
Entities retained as part of separation [Member]        
Income Tax Examination [Line Items]        
Open Tax Year     2006  
Entities acquired [Member]        
Income Tax Examination [Line Items]        
Open Tax Year     2006  
Foreign Tax Authority [Member]        
Income Tax Examination [Line Items]        
Income Tax Holiday, Description     Keysight benefits from tax incentives in several jurisdictions, most significantly in Singapore, and several jurisdictions have granted us tax incentives that require renewal at various times in the future. The tax incentives provide lower rates of taxation on certain classes of income and require thresholds of investments and employment or specific types of income in those jurisdictions.  
Income Tax Holiday, Termination Date     The Singapore tax incentive is due for renewal in fiscal 2024.  
Internal Revenue Service (IRS) [Member]        
Income Tax Examination [Line Items]        
Effective Income Tax Rate Reconciliation, Percent 5.90% 19.00% 9.20% 17.70%
Income Tax Expense (Benefit) $ 6 $ 17 $ 25 $ 51
Net Discrete Tax expense (Benefit) $ (1) $ 0 $ (2) $ (7)