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Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2024 USD ($) | Apr. 28, 2023 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) Reinsurer | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Ceded rate of premiums under insurance program |  |  |  | 100.00% | 100.00% |  |
Ceded unpaid loss |  |  |  | $ 2,034 | $ 2,034 |  |
Prepaid reinsurance premiums |  |  |  | 539 | 539 | $ 462 |
Increase (decrease) in loss and loss adjustment expense reserve |  |  |  |  | 0 |  |
Reinsurance recoverable |  |  |  | 2,036 | 2,036 | 125 |
Reserve for losses and loss adjustment expense |  |  |  | 2,034 | $ 2,034 |  |
Number of reinsurers | Reinsurer |  |  |  |  | 2 |  |
Premium net written |  |  |  |  | $ 121 |  |
Net earned premiums |  |  |  |  | 52 |  |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | 2,044 | 2,044 | 131 |
Hurricane Ian |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Loss reserve inclusive of IBNR claims |  |  |  | $ 3 | $ 3 |  | $ 3
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% |  |
Prepaid reinsurance premiums |  |  |  | $ 539 | $ 539 |  |
Expenses and allowance rate received in premiums |  |  |  | 29.50% | 29.50% |  |
Premiums written net |  |  |  |  | $ 773 |  |
Ceded to highly rated carriers for excess flood policies |  |  |  |  | 2 |  |
Statutory capital and surplus required |  |  |  | $ 8 | 8 |  |
Statutory capital and surplus |  |  |  | $ 43 | 43 | 39 |
Statutory net Income |  |  |  |  | $ 9 | $ 7 |
Percentage of adjusted net income |  |  |  | 100.00% | 100.00% |  |
Maximum dividend payout that may be made without prior approval |  |  |  | $ 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 |  |  |  |  | $ 771 |  |
Quota Share Captive |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Deferred acquisitions costs |  |  |  | 58 | 58 |  |
Reinsurance payable |  |  |  | 5 | 5 |  |
Reserve for losses and loss adjustment expense |  |  |  | 6 | 6 |  |
Premiums written net |  |  |  |  | 19 |  |
Premium net written |  |  |  | 10 |  |  |
Net earned premiums |  |  |  | 22 |  |  |
Initial funding |  |  | $ 6 |  |  |  |
Addition to earnings |  |  |  |  | 15 |  |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | $ 11 | 11 |  | $ 11
Captive Insurance Facility |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Maximum aggregate annual underwriting exposure |  |  |  |  | 2 |  |
Maximum annual amount per occurrence |  |  |  |  | $ 6 |  |

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