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Contracts Accounted for as Insurance - Net Earned Premiums (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |
Scheduled net earned premiums | $ 285 | $ 287 | $ 322
Accelerations from refundings and terminations | 29 | 179 | 59
Accretion of discount on net premiums receivable | 26 | 24 | 30
Financial guaranty insurance net earned premiums | 340 | 490 | 411
Specialty net earned premiums | 4 | 4 | 3
Net earned premiums | $ 344 | 494 | $ 414
Financial Guarantee Insurance And Other Product Line |  |  |
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |
Accelerations from refundings and terminations |  | $ 133 |

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- Definition This element represents the accretion of the discount for premiums receivable, net of ceded contracts, on financial guaranty insurance contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Financial Guarantee Insurance Contracts, Premiums Earned, Net + References No definition available. + Details
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- Definition Represents the amount of premium revenue on financial guaranty insurance contracts recognized during the period, excluding acceleration of premium earnings and accretion of discount on net premium receivable. + References No definition available. + Details
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- Definition Premiums Earned, Net, Specialty Insurance and Reinsurance + References No definition available. + Details
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- Definition This element represents the amount of premium revenue on financial guarantee insurance contracts recognized during the period that was accelerated for revenue recognition purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-4 + Details
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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, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 + Details
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- Details
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