v3.26.1
Insurance Company Subsidiary Operations - Additional Information (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
Reinsurer
Dec. 31, 2025
USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Ceded unpaid loss $ 131  
Prepaid reinsurance premiums 850 $ 980
Increase (decrease) in loss and loss adjustment expense reserve 0  
Unearned premiums 953 1,053
Total assets 29,887 $ 29,991
Variable Interest Entities ("VIEs")    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Total assets 948  
Total Liabilities $ 948  
Wright National Flood Insurance Company    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Ceded rate of premiums under insurance program 100.00%  
Prepaid reinsurance premiums $ 554  
Reserve for losses and loss adjustment expense $ 131  
Number of reinsurers | Reinsurer 2  
Expenses and allowance rate received in premiums 28.40%  
Premiums written net $ 540  
Ceded to highly rated carriers for excess flood policies 1  
Wright National Flood Insurance Company | FEMA    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Premiums written net 539  
Captive Insurance Facility    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Prepaid reinsurance premiums 296  
Deferred acquisitions costs 17  
Reinsurance payable 228  
Reserve for losses and loss adjustment expense 481  
Unearned premiums 399  
Premiums written net $ 183