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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
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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