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DEBT Debt (Textuals) (Details) - USD ($) $ in Millions | Apr. 30, 2019 | Oct. 31, 2018
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Debt Disclosure [Abstract] |  |
Letters of Credit Outstanding, Amount | $ 28 | $ 26
Long Term Debt Fair Value Over Carrying Value | $ 57 | $ 3

X
- Definition Long Term Debt Fair Value Over Carrying Value + References No definition available. + Details
Name: | keys_LongTermDebtFairValueOverCarryingValue
Namespace Prefix: | keys_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant