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INCOME TAXES Tax credit carryforward (Details) - Foreign Tax Authority - Capital Loss Carryforward [Member] $ in Millions | Oct. 31, 2020 USD ($)
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Tax Credit Carryforward [Line Items] |
Tax Credit Carryforward, Amount | $ 145
Foreign entities [Member] |
Tax Credit Carryforward [Line Items] |
Tax Credit Carryforward, Amount | $ 4

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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Period Type: |

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- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_CapitalLossCarryforwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=keys_ForeignentitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |