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Financial Guarantees in Force - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Guarantor Obligations [Line Items] |  |  |
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount | $ 0 | $ 8 | $ 1
Gross par amount of financial guarantees outstanding | 26,005 | 27,551 |
Net par amount of financial guarantees | 19,541 | 22,613 |
Gross financial guarantees in force | 41,733 | 44,734 |
Net financial guarantees in force | $ 29,121 | 34,975 |
Ceded Principal Outstanding Major Reinsurer Percentage | 10.60% |  |
Public Finance [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Net par amount of financial guarantees | $ 7,562 | $ 10,547 |

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- Definition Ceded Principal Outstanding Major Reinsurer Percentage. + References No definition available. + Details
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Balance Type: | na
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- Definition Financial guarantee insurance gross outstanding principal. + References No definition available. + Details
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Balance Type: | credit
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- Definition Financial guarantee insurance gross outstanding principal and interest. + References No definition available. + Details
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- Definition Financial guarantee insurance outstanding principal and interest, net of reinsurance. + References No definition available. + Details
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- Definition This element represents the amount of premium revenue on financial guarantee insurance contracts recognized during the period that was accelerated for revenue recognition purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-4 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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- Definition Amount of participating insurance in force. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479756/944-50-50-1 + Details
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- Details
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