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