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Reinsurance and Indemnification - Florida Hurricane Catastrophe Fund (Details) | 12 Months Ended
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May 31, 2020 USD ($) hurricane | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Reinsurance Retention Policy [Line Items] |  |  |  |
Ceded premium earned |  | $ 1,407,000,000 | $ 1,306,000,000 | $ 1,274,000,000
Florida Hurricane Catastrophe Fund |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Emergency assessment maximum percentage of premiums first year |  | 6.00% |  |
Emergency assessment maximum percentage of premiums subsequent years |  | 10.00% |  |
Emergency assessment, bonds issued |  |  |  | 2,000,000,000.00
Emergency assessment maximum percentage of premiums subsequent years, FL OIR |  | 0.00% |  |
Florida Hurricane Catastrophe Fund |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Ceded premium earned |  | $ 9,000,000 | 10,000,000 | 11,000,000
Ceded losses incurred |  | 33,000,000 | 143,000,000 | $ 19,000,000
Reinsurance and indemnification recoverables, net |  | $ 52,000,000 | $ 104,000,000 |
Forecast | Florida Hurricane Catastrophe Fund |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Percent of losses in excess of retention level to be reimbursed | 90.00% |  |  |
Retention level for losses related to 2 largest hurricanes | $ 52,000,000 |  |  |
Number of storms | hurricane | 2 |  |  |
Retention level for losses related to other hurricanes | $ 17,000,000 |  |  |
Maximum Retention level for losses related to hurricanes | $ 145,000,000 |  |  |

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- Definition The amount of bonds issued subject to funding through emergency assessments on property and casualty premiums. + References No definition available. + Details
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- Definition The maximum emergency assessment as a premium of all eligible property and casualty premiums in the state, for the payment of bonds issued to provide reimbursements for losses related to mandatory coverage, in the first year that such bonding is required. + References No definition available. + Details
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- Definition The maximum emergency assessment as a premium of all eligible property and casualty premiums in the state, for the payment of bonds issued to provide reimbursements for losses related to mandatory coverage, in the second and subsequent years that such bonding is required. + References No definition available. + Details
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- Definition Emergency Assessment Maximum Percentage of Premiums Subsequent Years, FL OIR + References No definition available. + Details
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- Definition Number of Storms + References No definition available. + Details
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- Definition The percentage of losses exceeding the entity's retention level for which access to reimbursement is provided. + References No definition available. + Details
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- Definition Represents the amount of reinsurance ceded under various contracts. + References No definition available. + Details
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- Definition The entity's maximum retention level for personal property losses related to catastrophes related to largest identified and others. + References No definition available. + Details
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- Definition The entity's retention level for personal property losses related to the largest identified catastrophes. + References No definition available. + Details
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- Definition The entity's retention level for personal property losses related to catastrophes other than the largest identified. + References No definition available. + Details
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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column C)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + 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=119400593&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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