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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, 2021
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	9.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	8.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	12.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	13.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	12.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	10.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	7.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	4.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	2.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	3.10%
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	29.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	32.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	16.20%
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	4.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	1.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	1.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	0.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	0.40%
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	8.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	18.80%
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	15.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	11.10%
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	5.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	1.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	1.50%
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	55.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	31.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	5.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	4.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	2.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine	0.10%

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Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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