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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
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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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 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 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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