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Reinsurance and Indemnification - Industry pools and facilities (Details) - USD ($) | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019
Reinsurance Retention Policy [Line Items] |  |  |  |  |
Cash and invested assets |  | $ 119,950,000,000 | $ 112,249,000,000 |  |
Accumulated deficit |  | (48,074,000,000) | (44,033,000,000) |  |
Ceded premium earned |  | 1,407,000,000 | 1,306,000,000 | $ 1,274,000,000 |
Michigan Catastrophic Claim Association |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |
Reinsurance and indemnification recoverables, net |  | 5,500,000,000 | 5,400,000,000 |  |
Program funding, per vehicle annual assessment |  | $ 220 |  |  |
Reinsurance increase, percentage |  | 6.00% |  |  |
Retention level per claim |  |  |  |  | $ 555,000
Cash and invested assets | $ 21,830,000,000 |  |  |  | 21,830,000,000
Accumulated deficit | (1,280,000,000) |  |  |  | $ (1,280,000,000)
Retained earnings accumulated deficit decrease | $ 39,640,000,000 |  |  |  |
New Jersey Unsatisfied Claim and Judgment Fund |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |
Reinsurance and indemnification recoverables, net |  | $ 446,000,000 | $ 461,000,000 |  |
Minimum medical benefits portion of personal injury protection coverage for reimbursement to insurers for policies issued or renewed prior to January 1, 1991 |  | 75,000 |  |  |
Minimum medical benefits portion of personal injury protection coverage for reimbursement to insurers for policies issued or renewed from January 1, 1991 to December 31, 2004 |  | 75,000 |  |  |
Maximum reimbursement to insurers for medical benefits paid under personal injury protection coverage. |  | 250,000 |  |  |
Reinsurance, administration assessments paid |  | $ 8,100,000 |  |  |
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 maximum percentage of premiums subsequent years, FL OIR |  | 0.00% |  |  |
Emergency assessment, bonds issued |  |  |  | $ 2,000,000,000.00 |

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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 Represents the maximum portion reimbursement to insurers for medical benefits paid under the personal injury protection coverage. + References No definition available. + Details
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- Definition Represents the minimum medical benefits portion of personal injury protection coverage for reimbursement to insurers for policies issued or renewed from January 1, 1991 to December 31, 2004. + References No definition available. + Details
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- Definition Represents the minimum medical benefits portion of personal injury protection coverage for reimbursement to insurers for policies issued or renewed prior to January 1, 1991. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: 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)(12)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + 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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