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Reinsurance - Industry pools and facilities (Details) | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | May 31, 2018 USD ($) hurricane | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2017 USD ($)
Reinsurance Retention Policy [Line Items] |  |  |  |  |  |  |
Reinsurance recoverables, net |  |  | $ 8,921,000,000 | $ 8,745,000,000 |  |  |
Cash and invested assets |  |  | 112,422,000,000 | 108,610,000,000 |  |  |
Accumulated deficit |  |  | (43,162,000,000) | (40,678,000,000) |  |  |
Ceded premium earned |  |  | 1,274,000,000 | 1,296,000,000 | $ 1,338,000,000 |  |
Michigan Catastrophic Claim Association |  |  |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |  |  |
Reinsurance recoverables, net |  |  | $ 5,260,000,000 | 4,950,000,000 |  |  |
Reinsurance increase, percentage |  |  | 6.00% |  |  |  |
Retention level per claim |  |  |  |  |  |  | $ 545,000
Term of catastrophe reinsurance agreement contract |  |  |  |  |  |  | 2 years
Program funding, per vehicle annual assessment |  |  | $ 170 |  |  |  |
Cash and invested assets | $ 19,600,000,000 |  |  |  |  |  | $ 19,600,000,000
Accumulated deficit | 2,630,000,000 |  |  |  |  |  | $ 2,630,000,000
Retained earnings accumulated deficit increase (decrease) | $ 46,080,000,000 |  |  |  |  |  |
National Flood Insurance Program |  |  |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |  |  |
Reinsurance recoverables, net |  |  | 88,000,000 | 77,000,000 |  |  |
Ceded premium earned |  |  | 263,000,000 | 274,000,000 | 293,000,000 |  |
Ceded losses incurred |  |  | 1,120,000,000 | 537,000,000 | 120,000,000 |  |
New Jersey Unsatisfied Claim and Judgment Fund |  |  |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |  |  |
Reinsurance recoverables, net |  |  | 493,000,000 | 506,000,000 |  |  |
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 |  |  | 8,900,000 |  |  |  |
Florida Hurricane Catastrophe Fund |  |  |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |  |  |
Reinsurance recoverables, net |  |  | 19,000,000 | 0 |  |  |
Ceded premium earned |  |  | 11,000,000 | 12,000,000 | 13,000,000 |  |
Ceded losses incurred |  |  | $ 19,000,000 | $ 0 | $ 0 |  |
Scenario, Forecast | Michigan Catastrophic Claim Association |  |  |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |  |  |
Retention level per claim |  |  |  |  |  | $ 555,000 |
Term of catastrophe reinsurance agreement contract |  |  |  |  |  | 2 years |
Scenario, 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 |  | $ 56,000,000 |  |  |  |  |
Number of storms | hurricane |  | 2 |  |  |  |  |
Retention level for losses related to other hurricanes |  | $ 19,000,000 |  |  |  |  |
Maximum Retention level for losses related to hurricanes |  | $ 187,000,000 |  |  |  |  |

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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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