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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 12, 2022
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Avast plc |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 2,383 | $ 2,383

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=gen_AvastPlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |