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Property and Casualty Insurance Reserves Historical Claims Duration (Details) | Dec. 31, 2017
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Preferred Personal Automobile Liability Insurance [Member] |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 39.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 69.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 84.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 92.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 96.10%
Preferred Personal Automobile Physical Damage Insurance [Member] |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 98.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 100.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 100.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 100.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 100.10%
Non-standard Personal Automobile Liability Insurance [Member] |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 42.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 80.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 93.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 97.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 99.40%
Non-standard Personal Automobile Physical Damage Insurance [Member] |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 92.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 100.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 100.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 100.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 100.10%
Homeowners [Member] |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 70.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 94.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 97.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 98.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 98.70%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 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 third 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 second 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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