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Reserve For Losses, LAE And Future Policy Benefit Reserve (Average Annual Percentage Payout Incurred Claims By Age, Net Of Reinsurance) (Details) | Dec. 31, 2019
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U.S. Reinsurance [Member] | Casualty Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 8.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 10.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 17.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 19.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 16.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 14.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 11.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 4.60%
U.S. Reinsurance [Member] | Property Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 36.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 34.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 13.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 7.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 2.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 2.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 2.20%
International [Member] | Casualty Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 16.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 13.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 12.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 8.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 8.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 8.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 6.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 4.90%
International [Member] | Property Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 25.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 34.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 15.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 7.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 3.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 1.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 8.60%
Bermuda [Member] | Casualty Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 7.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 9.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 9.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 10.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 10.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 10.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 8.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 6.30%
Bermuda [Member] | Property Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 19.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 28.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 25.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 14.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 2.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 2.20%
Insurance [Member] | Casualty Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 9.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 19.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 17.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 14.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 10.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 7.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 6.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 3.30%
Insurance [Member] | Property Business [Member] |
Shortduration Insurance Contracts Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One | 56.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two | 35.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three | 4.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four | 3.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five | 0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven | 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight | 0.00%

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