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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 78 | $ 56 | $ 47 |
Premiums Receivable, Gross | 290 | 269 | 323 | $ 370
Liability for Claims and Claims Adjustment Expense | 893 | 805 |  |
Subrogation recoverable | 137 | 271 |  |
Property and Casualty, Commercial Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense | 197 | 90 |  |
Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 140 | 150 |  |
Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 22 | 24 |  |
International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 85 | 85 |  |
Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 139 | 148 |  |
Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 2 |  |
Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 11 |  |
Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 7 | 8 |  |
Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 4 | 4 |  |
Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 64 | 64 |  |
Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 18 | 18 |  |
Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 3 | 2 |  |
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] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 4 | 5 |  |
Surveillance Category One [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 72 | 70 |  |
Surveillance Category One [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 131 | 140 |  |
Surveillance Category One [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 2 |  |
Surveillance Category One [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
Surveillance Category One [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 1 |  |
Surveillance Category One [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 4 | 4 |  |
Surveillance Category One [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 51 | 49 |  |
Surveillance Category One [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 18 | 18 |  |
Surveillance Category One [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 3 | 2 |  |
IA [Member] |  |  |  |
Premiums Receivable, Gross | 16 | 10 |  |
IA [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 3 | 3 |  |
IA [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 1 |  |
IA [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 13 | 7 |  |
IA [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 3 | 3 |  |
IA [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 1 |  |
IA [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 13 | 7 |  |
IA [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 5 |  |
II [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 5 |  |
II [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 5 |  |
II [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] |  |  |  |
Premiums Receivable, Gross | 7 | 16 |  |
III [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 7 | 7 |  |
III [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 9 |  |
III [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 7 | 7 |  |
III [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 9 |  |
III [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] |  |  |  |
Premiums Receivable, Gross | 11 | 11 |  |
IV [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 11 | 11 |  |
IV [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 11 | 11 |  |
IV [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
Reportable Geographical Components [Member] | UNITED STATES |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 65 | 41 | 27 |
Reportable Geographical Components [Member] | UNITED KINGDOM |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 11 | 13 | 14 |
Reportable Geographical Components [Member] | Other International [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 2 | $ 3 | $ 6 |

X
- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of financial guarantee premiums earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479686/944-605-45-1 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-3 Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-4 Reference 7: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-7 Reference 8: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 + Details
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- Definition The estimated amount as of the balance sheet date to be received by an insurer from the sale of property (usually damaged) on which the insurer has paid a total claim to the insured and has obtained title to the property and the right of an insurer to pursue any course of recovery of damages, in its name or in the name of the policyholder, against a third party who is liable for costs relating to an insured event that have been paid by the insurer. Estimated salvage and subrogation is generally deducted from the liability for unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479224/944-40-30-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479224/944-40-30-3 + Details
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