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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 41 | $ (5) | $ 7 |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 883 | (578) | (430) | $ (508)
Subrogation recoverable | (271) | (2,092) |  |
Claim liability reported on Balance Sheet, before reinsurance |  | (554) |  |
Liability for Claims and Claims Adjustment Expense | 805 | 1,570 |  |
Liabillity for Claim and Claim Adjustment Expense, with Impact of VIE Consolidation | 534 | (522) | (397) | $ (482)
Premiums Earned, Net | 56 | 47 | $ 54 |
Legacy Financial Guarantee |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Premiums Earned, Net | 42 | 46 |  |
Property and Casualty, Commercial Insurance |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 90 | 32 |  |
Premiums Earned, Net | 14 | 1 |  |
Property and Casualty, Commercial Insurance |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 90 | 32 |  |
Liabillity for Claim and Claim Adjustment Expense, with Impact of VIE Consolidation | 90 | 32 |  |
Unearned Premium Reserve [Member] |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Subrogation recoverable | 0 | 0 |  |
Claim liability reported on Balance Sheet, before reinsurance | (28) | (56) |  |
Liability for Claims and Claims Adjustment Expense | (28) | (56) |  |
Present Value of Expected Net Cash Flows- Claims and Loss Expenses [Member] |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Subrogation recoverable | 5 | 88 |  |
Claim liability reported on Balance Sheet, before reinsurance | 791 | 1,837 |  |
Liability for Claims and Claims Adjustment Expense | 787 | 1,749 |  |
Present Value of Expected Net Cash Flows-Recoveries [Member] |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Subrogation recoverable | (276) | (2,180) |  |
Claim liability reported on Balance Sheet, before reinsurance | (319) | (2,335) |  |
Liability for Claims and Claims Adjustment Expense | $ (44) | $ (155) |  |

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- Definition [Line Items] for Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Table] + References No definition available. + Details
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- Definition Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables + References No definition available. + Details
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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + 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(13)(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI https://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=6482241&loc=d3e13783-158432 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6482241&loc=d3e13779-158432 + Details
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- Definition This element represents the claim liability, reported on or included in the statement of financial position, related to financial guarantee insurance contracts and presented in the schedule of insured financial obligations with credit deterioration in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 34 -URI https://asc.fasb.org/extlink&oid=99379334&loc=SL5751140-161288 + Details
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