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Reinsurance (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Insurance [Line Items]    
Letters of Credit Outstanding, Amount $ 131  
Deferred Ceded Premiums And Reinsurance Recoverables 398  
Reinsurance Payable $ 90 $ 39
Percentage of Ceded Reinsurance Recoverable Represented by Top Three 74.00%  
Reinsurance Recoverables, Gross $ 195  
Net unsecured reinsurance recoverable 128  
Reinsurance Recoverable, Gross, All Other 50  
Unsecured Reinsurance Recoverable, All Other 21  
Reinsurance Recoverable Credit Exposure 128 60
Uncollateralized Credit Exposure Supoorted by Unlimited Uncapped Indemnity $ 44 $ 45
Number of Reinsurers Covering Majority 3  
QBE Insurance Corporation | Property and Casualty, Commercial Insurance    
Insurance [Line Items]    
Reinsurance Recoverables, Gross $ 38  
Net unsecured reinsurance recoverable 38  
Assured Guaranty Re Ltd [Member] | Financial Guarantee    
Insurance [Line Items]    
Reinsurance Recoverables, Gross 25  
Net unsecured reinsurance recoverable 0  
General Reinsurance Company | Property and Casualty, Commercial Insurance    
Insurance [Line Items]    
Reinsurance Recoverables, Gross 81  
Net unsecured reinsurance recoverable $ 69