DEBT Facility (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Line of Credit Facility [Line Items]
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. During the three months ended July 31, 2017, we repaid $140 million of borrowings outstanding under the Revolving Credit Facility. As of July 31, 2017, we had no borrowings outstanding under the Revolving Credit Facility. We were in compliance with the covenants of the Revolving Credit Facility during the nine months ended July 31, 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	$ 0
Facility, Covenant Compliance	We were in compliance with the covenants of the Revolving Credit Facility during the nine months ended July 31, 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 nine months ended July 31, 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
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.30%
Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	3 years
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR + 1.50%
Debt Instrument, Basis Spread on Variable Rate	1.50%