Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Average Annual Percentage Payout Of Incurred Claims By Age Net Of Reinsurance) (Details) - Property and Casualty Insurance [Member]	Dec. 31, 2020
Average annual Percentage Payout [Abstract]
Year 1	52.20%
Year 2	21.40%
Year 3	11.00%
Year 4	2.00%
Year 5	5.60%
Year 6	0.00%
Year 7	0.00%