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Financial Guarantees in Force - Summary of International Finance Guaranteed Portfolio (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 28,020 | $ 33,888
International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 10,756 | 12,054
International Finance [Member] | United Kingdom [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 9,255 | 9,711
International Finance [Member] | Australia [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 203 | 420
International Finance [Member] | Italy [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 718 | 803
International Finance [Member] | Austria [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 343 | 707
International Finance [Member] | FRANCE |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 219 | 277
International Finance [Member] | Other International [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 18 | 136
International Finance [Member] | United States [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 17,264 | $ 21,834

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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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- 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 http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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