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DEBT Debt (Textuals) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018
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