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Reserve For Losses, LAE And Future Policy Benefit Reserve (Average Annual Percentage Payout Incurred Claims By Age, Net Of Reinsurance) (Details)
Dec. 31, 2022
Reinsurance [Member] | Casualty Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 8.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 7.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 11.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 12.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 12.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 10.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 6.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 4.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 3.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten 1.50%
Reinsurance [Member] | Property Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 27.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 31.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 16.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 8.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 4.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 2.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten 0.10%
Insurance [Member] | Casualty Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 8.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 17.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 16.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 15.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 13.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 8.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 5.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 3.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 2.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten 1.30%
Insurance [Member] | Property Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 54.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 31.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 5.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 4.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 2.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 1.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten 0.00%