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Financial Guarantees in Force - Summary of International Finance Guaranteed Portfolio (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 19,541 | $ 22,613
International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 8,664 | 8,454
International Finance [Member] | United Kingdom [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,502 | 7,223
International Finance [Member] | Australia [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 266 | 259
International Finance [Member] | Italy [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 576 | 644
International Finance [Member] | AUSTRIA |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 307 | 310
International Finance [Member] | FRANCE |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 12 | 14
International Finance [Member] | Other International [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1 | 4
International Finance [Member] | United States [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 10,877 | $ 14,159

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