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, 2018
Average annual Percentage Payout [Abstract]
Year 1	54.70%
Year 2	20.10%
Year 3	10.40%
Year 4	3.90%
Year 5	4.80%
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, 2018

Average annual Percentage Payout [Abstract]

54.70%

20.10%

10.40%

3.90%

4.80%

0.10%

0.00%