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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) Item | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2015 USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | $ 8,102 | $ 7,400 | $ 6,149 |
Prior year losses | (2) | (9) | 401 |
Reinsurance recoverable for paid and unpaid losses | $ 2,200 | 2,100 |  |
Contracts of insurance and reinsurance received claims during the past three years, in years | 20 years |  |  |
Business acquisition, cost of acquired entity and operations, cash paid |  |  |  | $ 140
Liabilities retroceded, percentage |  |  |  | 100.00%
Maximum liability retroceded |  | 450 |  | $ 440
Increase (decrease) in A&E reserves | $ 138 |  |  |
Decrease in amount of liabilities retroceded |  | 43 |  |
Total amount of liabilities retroceded |  |  |  | $ 300
Number of exposure groupings | Item | 200 |  |  |
Other Retrocessionaire [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% |  |  |
Catastrophe Losses [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | $ (80) | 710 |  |
Covid-19 [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses |  |  | $ 511 |
Higher Premiums Earned [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | 45 | $ 541 |  |
Munich Reinsurance Company [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 283 |  |  |
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 12.60% |  |  |
Endurance Re [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 148 |  |  |
Endurance Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 6.60% |  |  |
Mt Logan Re [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 520 |  |  |
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 23.20% |  |  |

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