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Reinsurance and Indemnification - Per Occurrence Excess Agreement (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) layer reinstatement | Dec. 31, 2017 USD ($)
Reinsurance Retention Policy [Line Items] |  |
Reinsurance and indemnification recoverables, net | $ 9,565 | $ 8,921
Retention amount for catastrophe reinsurance agreement contracts | 500 |
Catastrophe Reinsurance Layers |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance and indemnification recoverables, net | 517 |
Net income | 60 |
Reinsurance, Incremental Reinstatement Premiums | $ 30 |
Catastrophe Reinsurance First Five Layers |  |
Reinsurance Retention Policy [Line Items] |  |
Number of layers subject to reinstatement in which catastrophe reinsurance agreement contracts are placed | layer | 3 |
Retention percentage of reinsurance limit | 31.70% |
Catastrophe Reinsurance Sixth Layer |  |
Reinsurance Retention Policy [Line Items] |  |
Retention percentage of reinsurance limit | 95.00% |
Catastrophe Reinsurance Layer, One to Six |  |
Reinsurance Retention Policy [Line Items] |  |
Limit of aggregate losses under aggregate excess agreement | $ 3,070 |
Catastrophe Reinsurance Eight Layer |  |
Reinsurance Retention Policy [Line Items] |  |
Retention percentage of reinsurance limit | 29.37% |
Catastrophe reinsurance aggregate annual loss limit | $ 446 |
Catastrophe Reinsurance, Six And Eight Layer |  |
Reinsurance Retention Policy [Line Items] |  |
Number of reinstatements each year for each contract | reinstatement | 1 |
Term of catastrophe reinsurance agreement contract | 7 years |
Catastrophe Reinsurance, Eight And Nine Layer |  |
Reinsurance Retention Policy [Line Items] |  |
Retention percentage of reinsurance limit | 100.00% |
Limit of aggregate losses under aggregate excess agreement | $ 69 |
Retention amount for catastrophe reinsurance agreement contracts | 2,750 |
Catastrophe reinsurance aggregate annual loss limit | $ 1,250 |
Reinsured risk, percentage | 5.00% |

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- Definition Represents the number of reinstatements each year for each contract. + References No definition available. + Details
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- Definition The limit of aggregated losses per contract year beyond which coverage provided by an aggregate excess agreement applies. + References No definition available. + Details
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- Definition Represents the number of layers subject to reinstatement in which catastrophe reinsurance agreement contracts are placed. + References No definition available. + Details
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- Definition Represents the period of catastrophe reinsurance agreement contract. + References No definition available. + Details
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- Definition Represents the retention amount of catastrophe reinsurance agreement contracts. + References No definition available. + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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