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, 2016
Average annual Percentage Payout [Abstract]
Year 1	56.10%
Year 2	20.30%
Year 3	14.50%
Year 4	5.10%
Year 5	3.70%

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, 2016

Average annual Percentage Payout [Abstract]

56.10%

20.30%

14.50%

5.10%

3.70%