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Liability for Policy and Contract Claims - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred related to insured events of prior year | $ (118) | $ (120)
Enact Segment |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred related to insured events of prior year | $ 131 | $ 133

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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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Balance Type: | na
Period Type: | duration

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Period Type: |