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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, 2021 | Dec. 31, 2020
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Premiums Receivable, Gross | $ 329 | $ 387
Public Finance [Member] |  |
Premiums Receivable, Gross | 159 | 185
Housing Revenue [Member] | Public Finance [Member] |  |
Premiums Receivable, Gross | 157 | 168
Surveillance Category One [Member] |  |
Premiums Receivable, Gross | 277 | 302
Surveillance Category One [Member] | Public Finance [Member] |  |
Premiums Receivable, Gross | 151 | 157
Surveillance Category One [Member] | Housing Revenue [Member] | Public Finance [Member] |  |
Premiums Receivable, Gross | $ 149 | $ 155

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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