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Liability for Policy and Contract Claims (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total liability for policy and contract claims | $ 649 | $ 652 | $ 628 | $ 683
Enact segment |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total liability for policy and contract claims | 508 | 518 |  |
Life and Annuities segment |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total liability for policy and contract claims | 135 | 126 |  |
Other mortgage insurance business |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total liability for policy and contract claims | $ 6 | $ 8 |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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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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