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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Apr. 01, 2018 | Sep. 30, 2022 | Dec. 31, 2021
Effects of Reinsurance [Line Items] |  |  |
Amount on deposit in trust accounts |  | $ 2,200 |
Restricted cash |  | 107 |
Preferred shares |  |  |
Mt Logan Re [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of voting common shares owned by Group |  | 100.00% |
Retrocede amount | $ 269 |  |
Cash transferred | 252 |  |
Mt Logan Re [Member] | Minimum [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Accident year |  | 2002 |
Mt Logan Re [Member] | Maximum [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Accident year |  | 2015 |
Liability retroceded | $ 319 |  |

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