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Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 31 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2024 USD ($) | Apr. 28, 2023 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) Reinsurer | Dec. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Ceded rate of premiums under insurance program |  |  |  | 100.00% | 100.00% |  | 100.00% |
Ceded unpaid loss |  |  |  | $ 98 | $ 98 |  | $ 98 |
Prepaid reinsurance premiums |  |  |  | 483 | 483 | $ 462 | 483 |
Increase (decrease) in loss and loss adjustment expense reserve |  |  |  |  | 0 |  |  |
Reinsurance recoverable |  |  |  | 100 | 100 | 125 | 100 |
Reserve for losses and loss adjustment expense |  |  |  | 98 | $ 98 |  | 98 |
Number of reinsurers | Reinsurer |  |  |  |  | 2 |  |  |
Premium net written |  |  |  |  | $ 106 |  |  |
Net earned premiums |  |  |  |  | 28 |  |  |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | 108 | 108 | 131 | 108 |
Hurricane Ian |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Loss reserve inclusive of IBNR claims |  |  |  | 3 | 3 |  | 3 | $ 3
Reported insured losses |  |  |  | $ 2 | $ 2 |  | $ 2 |
Wright National Flood Insurance Company |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Ceded rate of premiums under insurance program |  |  |  | 100.00% | 100.00% |  | 100.00% |
Prepaid reinsurance premiums |  |  |  | $ 483 | $ 483 |  | $ 483 |
Expenses and allowance rate received in premiums |  |  |  | 29.50% | 29.50% |  | 29.50% |
Premiums written net |  |  |  |  | $ 475 |  |  |
Ceded to highly rated carriers for excess flood policies |  |  |  |  | 2 |  |  |
Statutory capital and surplus required |  |  |  | $ 8 | 8 |  | $ 8 |
Statutory capital and surplus |  |  |  | $ 42 | 42 | 39 | $ 42 |
Statutory net Income |  |  |  |  | $ 9 | $ 7 |  |
Percentage of adjusted net income |  |  |  | 100.00% | 100.00% |  | 100.00% |
Maximum dividend payout that may be made without prior approval |  |  |  | $ 7 | $ 7 |  | $ 7 |
Dividend paid | $ 7 | $ 3 |  |  |  |  |  |
Wright National Flood Insurance Company | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  | 10.00% |  |  |
Wright National Flood Insurance Company | FEMA |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Premiums written net |  |  |  |  | $ 473 |  |  |
Quota Share Captive |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Deferred acquisitions costs |  |  |  | 63 | 63 |  | 63 |
Reinsurance payable |  |  |  | 6 | 6 |  | 6 |
Reserve for losses and loss adjustment expense |  |  |  | 7 | 7 |  | 7 |
Premiums written net |  |  |  |  | 22 |  |  |
Premium net written |  |  |  | 106 |  |  |  |
Net earned premiums |  |  |  | 27 |  |  |  |
Initial funding |  |  | $ 6 |  |  |  |  |
Addition to earnings |  |  |  |  |  |  | 4 |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | $ 11 | 11 |  | $ 11 | $ 11
Captive Insurance Facility |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Maximum aggregate annual underwriting exposure |  |  |  |  | $ 2 |  |  |

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