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Property and Casualty Insurance Reserves - Historical Claims Duration (Details) | Dec. 31, 2020
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Specialty Personal Automobile Insurance—Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 41.90%
Year 2 | 80.90%
Year 3 | 92.60%
Year 4 | 96.70%
Year 5 | 98.60%
Specialty Personal Automobile Insurance—Physical Damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 93.00%
Year 2 | 100.80%
Year 3 | 100.10%
Year 4 | 100.00%
Year 5 | 100.00%
Commercial Automobile Insurance—Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 29.50%
Year 2 | 61.50%
Year 3 | 78.30%
Year 4 | 88.70%
Year 5 | 94.90%
Commercial Automobile Insurance—Physical Damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 89.30%
Year 2 | 99.90%
Year 3 | 99.90%
Year 4 | 100.00%
Year 5 | 100.00%
Preferred Personal Automobile Insurance—Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 33.60%
Year 2 | 66.40%
Year 3 | 83.00%
Year 4 | 90.70%
Year 5 | 95.50%
Preferred Personal Automobile Insurance—Physical Damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 97.20%
Year 2 | 100.80%
Year 3 | 100.10%
Year 4 | 100.00%
Year 5 | 100.00%
Homeowners |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 67.30%
Year 2 | 96.30%
Year 3 | 97.40%
Year 4 | 98.60%
Year 5 | 99.20%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
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