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DEBT Debt (Textuals) (Details) - USD ($) $ in Millions	Jan. 31, 2020	Oct. 31, 2019
Debt Disclosure [Abstract]
Letters of Credit Outstanding, Amount	$ 38	$ 37
Long Term Debt Fair Value Over Carrying Value	$ 175	$ 139

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

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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