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Insurance Regulatory Restrictions Additional Details (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Average Annual Rate Of Return | 3.22% | 5.28%
Prescribed Discount Rate Percentage | 5.10% |
Minimum [Member] |  |
Settlement Agreement Annual Restricted Payment Amount | $ 5 |
Maximum [Member] |  |
Settlement Agreement Annual Restricted Payment Amount | 8 |
Ambac Assurance [Member] |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 598 | $ 757
Ambac Assurance [Member] | Prescribed Or Permitted Additional Accounting Practices [Member] |  |
Statutory Accounting Practices, Prescribed Practice, Amount | 90 | (5)
Everspan Indemnity |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 107 | $ 106
Everspan Indemnity | Prescribed Or Permitted Additional Accounting Practices [Member] |  |
Statutory Accounting Practices, Prescribed Practice, Amount | $ 18 |

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- Definition Amount as of the balance sheet date of each item listed to reconcile the differences resulting from applying state prescribed statutory accounting practices rather than statutory accounting practices prescribed by National Association of Insurance Commissioners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24746-158529 + Details
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