DEBT Facility (Details) - USD ($)
$ in Millions
6 Months Ended
Feb. 15, 2017
Jan. 30, 2017
Apr. 30, 2017
Apr. 30, 2016
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.30%      
Amortization of Debt Issuance Costs     $ 9 $ 0
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Term 5 years      
Facility, Description On February 15, 2017, we entered into an amended and restated credit agreement (the “Revolving Credit Facility”) that replaced our existing $450 million unsecured credit facility dated September 15, 2014. The Revolving Credit Facility provides for a $450 million, five-year unsecured revolving credit facility that will expire on February 15, 2022 and bears interest at an annual rate of LIBOR + 1.30%. In addition, the Revolving Credit Facility permits us to increase the total commitments under this credit facility by up to $150 million in the aggregate on one or more occasions upon request. We may use amounts borrowed under the facility for general corporate purposes. As of April 30, 2017, we had $140 million of borrowings outstanding under the Revolving Credit Facility. We were in compliance with the covenants of the Revolving Credit Facility during the six months ended April 30, 2017.      
Facility, Initiation Date     Feb. 15, 2017  
Facility, Maximum Borrowing Capacity $ 450      
Facility, Expiration Date     Feb. 15, 2022  
Debt Instrument, Description of Variable Rate Basis LIBOR + 1.30%      
Additional drawings on credit facility $ 150      
Facility, Outstanding     $ 140  
Facility, Covenant Compliance     We were in compliance with the covenants of the Revolving Credit Facility during the six months ended April 30, 2017.  
Bridge Loan [Member]        
Line of Credit Facility [Line Items]        
Facility, Description   On January 30, 2017, we entered into a commitment letter, pursuant to which certain lenders agreed to provide a senior unsecured 364-day bridge loan facility of up to $1.684 billion (“the Bridge Facility”) for the purpose of providing the financing to support Keysight's acquisition of Ixia. Under the terms of commitment letter, the Bridge Facility was automatically terminated upon the Ixia acquisition on April 18, 2017. For the three months ended April 30, 2017, we incurred costs in connection with the Bridge Facility of $9 million that were amortized to interest expense.    
Facility, Initiation Date     Jan. 30, 2017  
Facility, Maximum Borrowing Capacity   $ 1,684    
Facility, Expiration Date     Apr. 18, 2017  
Line of Credit Facility, Expiration Period   364 days    
Amortization of Debt Issuance Costs     $ 9