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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 805
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478072/944-805-50-1

+ Details

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

- Definition

Weighted-average period of amortization for finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

+ References

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of identifiable indefinite-lived intangible asset acquired in business combination and recognized at acquisition date. Excludes goodwill and financial asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of identifiable intangible asset acquired in business combination and recognized at acquisition date. Excludes goodwill and financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-41

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 45
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-45

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of identifiable finite-lived intangible asset acquired in business combination and recognized at acquisition date.

+ References

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflows from the purchase of net carrying value allocated to in-process research and development costs and materials acquired in a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_PaymentsToAcquireInProcessResearchAndDevelopment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=keys_SpirentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=keys_SynopsysOpticalSolutionsGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OrderOrProductionBacklogMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ACQUISITIONS (Intangible Assets Acquired) (Details) - USD ($) $ in Millions			6 Months Ended
	Oct. 17, 2025	Oct. 15, 2025	Apr. 30, 2026
Intangible Asset, Finite-Lived, Acquired [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Spirent
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill		$ 528
Synopsys Optical solutions group
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	$ 271
Indefinite-Lived Intangible Assets (Excluding Goodwill)	5
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	276
Payments to Acquire in Process Research and Development	2
Developed technology
Intangible Asset, Finite-Lived, Acquired [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Developed technology \| Spirent
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived		$ 370
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		6 years
Developed technology \| Synopsys Optical solutions group
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	$ 183
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Customer relationships
Intangible Asset, Finite-Lived, Acquired [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			6 years
Customer relationships \| Spirent
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived		$ 145
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		8 years
Customer relationships \| Synopsys Optical solutions group
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	$ 86
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Backlog
Intangible Asset, Finite-Lived, Acquired [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			1 year
Backlog \| Spirent
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived		$ 9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year
Backlog \| Synopsys Optical solutions group
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	$ 1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years
Trademarks and Trade Names \| Spirent
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived		$ 4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year
Trademarks and Trade Names \| Synopsys Optical solutions group
Intangible Asset, Finite-Lived, Acquired [Line Items]
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	$ 1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year