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Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  | $ 3 |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 35 | 20 |  |
Subrogation recoverable | (130) |  | $ (137) |
Claim liability reported on Balance Sheet, before reinsurance | 484 |  | 559 |
Liability for Claims and Claims Adjustment Expense | 851 |  | 893 |
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables | 721 | $ 705 | 756 | $ 534
Property and Casualty, Commercial Insurance |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 237 |  | 197 |
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables | 237 |  | 197 |
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 | 1 |  | 1 |
Claim liability reported on Balance Sheet, before reinsurance | 695 |  | 780 |
Liability for Claims and Claims Adjustment Expense | 693 |  | 779 |
Present Value of Expected Net Cash Flows-Recoveries [Member] |  |  |  |
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Subrogation recoverable | (131) |  | (139) |
Claim liability reported on Balance Sheet, before reinsurance | (187) |  | (194) |
Liability for Claims and Claims Adjustment Expense | (56) |  | (55) |
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 | (24) |  | (28) |
Liability for Claims and Claims Adjustment Expense | $ (24) |  | $ (28) |

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- Definition Ceded Loss And Loss Expenses Paid Not Yet Recovered + References No definition available. + Details
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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 -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 of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 + 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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- 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 -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-34 + Details
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