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, 2019
Average annual Percentage Payout [Abstract]
Year 1	54.40%
Year 2	20.50%
Year 3	10.20%
Year 4	3.60%
Year 5	5.90%
Year 6	0.10%
Year 7	0.00%

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, 2019

Average annual Percentage Payout [Abstract]

54.40%

20.50%

10.20%

3.60%

5.90%

0.10%

0.00%