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Financial Guarantees in Force - Summary of International Finance Guaranteed Portfolio (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 22,613 | $ 28,020
International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 8,454 | 10,756
International Finance [Member] | United Kingdom [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,223 | 9,255
International Finance [Member] | Australia [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 259 | 203
International Finance [Member] | Italy [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 644 | 718
International Finance [Member] | Austria [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 310 | 343
International Finance [Member] | FRANCE |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 14 | 219
International Finance [Member] | Other International [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 4 | 18
International Finance [Member] | United States [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 14,159 | $ 17,264

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- Definition Amount of participating insurance in force. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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