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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Average Annual Payout of Incurred Claims by Age, P&C (Details)	Dec. 31, 2016
Accident and Health Insurance Product Line [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(120.00%)
General Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	450.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	940.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(1620.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1730.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	1340.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	850.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	750.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	300.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(180.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	150.00%
Package Business [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	3920.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	2240.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(1070.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	830.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	560.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	360.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	190.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	130.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(80.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	50.00%
Commercial Property [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	6400.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	2800.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(450.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	140.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	80.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(0.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%
Commercial Auto Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	1780.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	2100.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(2070.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1830.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	1070.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	500.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	240.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	80.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(40.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	30.00%
Commercial Auto Physical Damage [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	9120.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	870.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(30.00%)
Professional Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	540.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	1820.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(1760.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1520.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	970.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	880.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	240.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	410.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(90.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	410.00%
Surety Product Line [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	1470.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	2770.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(1410.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	340.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	380.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	760.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	520.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	470.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(70.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	170.00%
Personal Auto Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	3780.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	3310.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(1540.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	740.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	350.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	120.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	50.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	30.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(10.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%
Personal Auto Physical Damage [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	9620.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	340.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(20.00%)
Homeowners [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	7260.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	2110.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(310.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	150.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	60.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	30.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(10.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%
Property and Casualty, Commercial Insurance Product Line [Member] | Accident and Health Insurance Product Line [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	1630.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	2030.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	(1330.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	920.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	660.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	470.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	370.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	280.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(190.00%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	130.00%

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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 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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