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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
--- | --- | --- | --- | --- | ---
Jun. 27, 2025 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) Reinsurer | Dec. 31, 2024 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Ceded rate of premiums under insurance program |  |  | 100.00% | 100.00% |
Ceded unpaid loss |  |  | $ 383 | $ 383 |
Prepaid reinsurance premiums |  |  | 529 | 529 | $ 520
Increase (decrease) in loss and loss adjustment expense reserve |  |  |  | 0 |
Reinsurance recoverable |  |  | 385 | $ 385 | 1,527
Number of reinsurers | Reinsurer |  |  |  | 2 |
Premium net written |  |  |  | $ 80 |
Net earned premiums |  |  |  | 36 |
Ultimate loss reserve expense inclusive of IBNR claims |  |  | $ 400 | $ 400 | 1,543
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 |  |  | $ 529 | $ 529 |
Reserve for losses and loss adjustment expense |  |  | $ 383 | $ 383 |
Expenses and allowance rate received in premiums |  |  | 29.10% | 29.10% |
Premiums written net |  |  |  | $ 516 |
Ceded to highly rated carriers for excess flood policies |  |  |  | 2 |
Statutory capital and surplus required |  |  | $ 8 | 8 |
Statutory capital and surplus |  |  | $ 36 | $ 36 | 44
Statutory net Income |  |  |  |  | $ 9
Percentage of adjusted net income |  |  | 100.00% | 100.00% |
Maximum dividend payout that may be made without prior approval |  |  | $ 9 | $ 9 |
Dividend paid | $ 9 |  |  |  |
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 |  |  |  | $ 514 |
Quota Share Captive |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Deferred acquisitions costs |  |  | 78 | 78 |
Reinsurance payable |  |  | 5 | 5 |
Reserve for losses and loss adjustment expense |  |  | 14 | 14 |
Premiums written net |  |  |  | 34 |
Premium net written |  |  | 79 |  |
Net earned premiums |  |  | 36 |  |
Initial funding |  | $ 6 |  |  |
Addition to earnings |  |  |  | 31 |
Ultimate loss reserve expense inclusive of IBNR claims |  |  | $ 24 | 24 |
Captive Insurance Facility |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Maximum aggregate annual underwriting exposure |  |  |  | 2 |
Maximum annual amount per occurrence |  |  |  | $ 4 |

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