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Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | $ 1,608 | $ 1,604 | $ 1,365
Assumed written premiums | 9,350 | 9,062 | 7,264
Mt Logan Re [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | 201 | 341 | 303
Ceded earned premiums | 206 | 333 | 306
Ceded losses and LAE | 191 | 282 | 241
Assumed written premiums | 5 | 12 | 19
Assumed earned premiums | $ 5 | $ 12 | $ 19

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- Definition Ceded Losses And Loss Adjustment Expenses + References No definition available. + Details
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