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Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Premiums Receivable, Gross | $ 290 | $ 269 | $ 323 | $ 370
Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 140 | 150 |  |
Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 139 | 148 |  |
Surveillance Category One [Member] |  |  |  |
Premiums Receivable, Gross | 210 | 217 |  |
Surveillance Category One [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 133 | 142 |  |
Surveillance Category One [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | $ 131 | $ 140 |  |

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- Definition Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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