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Transactions With Related Parties (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]        
Net premiums written $ 4,515 $ 4,085    
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses 8,969 7,509 $ 8,260 $ 7,064
Reinsurance balances payable 2,661   2,137  
Other assets 6,196   6,231  
Other liabilities 3,165   3,039  
Operating affiliates | Premia        
Related Party Transaction [Line Items]        
Funds held asset 137   137  
Operating affiliates | Somers        
Related Party Transaction [Line Items]        
Net premiums written 216 $ 219    
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses 1,700   1,600  
Reinsurance balances payable 570   $ 489  
Equity Method Investee | Greysbridge Holdings Ltd        
Related Party Transaction [Line Items]        
Other assets 268      
Other liabilities $ 268