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RESERVE FOR LOSSES AND LOSS EXPENSES - Average annual percentage payout of incurred claims by age, net of reinsurance (Details) | Dec. 31, 2017
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Insurance | Property and Other |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 34.40%
Year 2 | 40.60%
Year 3 | 12.20%
Year 4 | 5.40%
Year 5 | 3.60%
Year 6 | 0.80%
Year 7 | 0.90%
Year 8 | 0.10%
Year 9 | 0.20%
Year 10 | (0.20%)
Insurance | Marine |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 22.60%
Year 2 | 28.60%
Year 3 | 18.80%
Year 4 | 8.30%
Year 5 | 3.10%
Year 6 | 2.30%
Year 7 | 3.30%
Year 8 | (2.30%)
Year 9 | 0.40%
Year 10 | 0.00%
Insurance | Aviation |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 18.70%
Year 2 | 24.40%
Year 3 | 19.40%
Year 4 | 15.50%
Year 5 | 9.50%
Year 6 | 3.00%
Year 7 | 2.80%
Year 8 | 2.60%
Year 9 | 1.50%
Year 10 | (0.10%)
Insurance | Credit and Political Risk |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 18.80%
Year 2 | 54.10%
Year 3 | (4.30%)
Year 4 | 3.30%
Year 5 | 20.30%
Year 6 | 1.10%
Year 7 | (0.50%)
Year 8 | 0.00%
Year 9 | (0.70%)
Year 10 | (0.60%)
Insurance | Professional Lines |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 3.70%
Year 2 | 10.90%
Year 3 | 14.70%
Year 4 | 14.50%
Year 5 | 12.50%
Year 6 | 8.90%
Year 7 | 8.90%
Year 8 | 10.50%
Year 9 | 5.60%
Year 10 | 0.30%
Insurance | Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 2.50%
Year 2 | 11.30%
Year 3 | 13.20%
Year 4 | 16.20%
Year 5 | 10.10%
Year 6 | 8.70%
Year 7 | 4.80%
Year 8 | 19.40%
Year 9 | 3.60%
Year 10 | 27.10%
Reinsurance | Property and Other |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 20.60%
Year 2 | 36.60%
Year 3 | 20.80%
Year 4 | 7.40%
Year 5 | 4.20%
Year 6 | 3.00%
Year 7 | 1.80%
Year 8 | 0.90%
Year 9 | (0.90%)
Year 10 | (0.30%)
Reinsurance | Credit and Surety |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 27.30%
Year 2 | 32.20%
Year 3 | 10.90%
Year 4 | 6.00%
Year 5 | 3.50%
Year 6 | 2.00%
Year 7 | 1.70%
Year 8 | 0.70%
Year 9 | 0.30%
Year 10 | 0.20%
Reinsurance | Professional Lines |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 0.80%
Year 2 | 5.30%
Year 3 | 11.10%
Year 4 | 13.90%
Year 5 | 12.40%
Year 6 | 12.50%
Year 7 | 9.60%
Year 8 | 6.20%
Year 9 | 4.00%
Year 10 | 3.70%
Reinsurance | Motor |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 16.80%
Year 2 | 13.20%
Year 3 | 7.60%
Year 4 | 5.00%
Year 5 | 4.10%
Year 6 | 4.80%
Year 7 | 3.60%
Year 8 | 2.70%
Year 9 | 3.20%
Year 10 | 0.70%
Reinsurance | Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 2.90%
Year 2 | 8.90%
Year 3 | 13.00%
Year 4 | 11.30%
Year 5 | 10.60%
Year 6 | 11.60%
Year 7 | 8.50%
Year 8 | 3.80%
Year 9 | 4.00%
Year 10 | 6.80%

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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 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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- Definition 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. + 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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