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Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]      
Gross reserves beginning of period $ 19,009 $ 16,322 $ 13,531
Less reinsurance recoverables on unpaid losses (1,946) (1,844) (1,641)
Net reserves beginning of period 17,063 14,478 11,891
Incurred related to: Current year 8,102 7,400 6,149
Incurred related to: Prior years (2) (9) 401
Total incurred losses and LAE 8,100 7,391 6,551
Paid related to: Current year 1,220 2,491 2,046
Paid related to: Prior years 3,740 2,226 2,078
Total paid losses and LAE 4,960 4,717 4,124
Foreign exchange/translation adjustment (243) (89) 161
Net reserves end of period 19,960 17,063 14,478
Plus reinsurance recoverables on unpaid losses 2,105 1,946 1,844
Gross reserves end of period $ 22,065 $ 19,009 $ 16,322