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Transactions with Related Parties (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
director
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2021
Related Party Transaction [Line Items]          
Purchases of other investments $ 3,485 $ 2,171 $ 1,720    
Net premiums written 15,732 13,468 11,078    
Net premiums earned 15,100 12,440 9,679    
Reinsurance recoverable for paid and unpaid claims and claims adjustments 8,260 7,064 $ 6,564    
Reinsurance balances payable 2,137 2,000      
Other assets 6,231 4,761      
Other liabilities $ 3,039 1,942      
Premia Holdings Ltd          
Related Party Transaction [Line Items]          
Number of directors | director 7        
Greysbridge Holdings Ltd          
Related Party Transaction [Line Items]          
Percentage ownership         40.00%
Equity Method Investee | Watford Insurance Company          
Related Party Transaction [Line Items]          
Consideration paid $ 35        
Equity Method Investee | Premia Holdings Ltd          
Related Party Transaction [Line Items]          
Percentage ownership       25.00%  
Purchases of other investments       $ 100  
Number of directors | director 2        
Net premiums written   80      
Net premiums earned   81      
Funds held asset $ 137 158      
Equity Method Investee | Greysbridge Holdings Ltd          
Related Party Transaction [Line Items]          
Other assets 261        
Other liabilities 261        
Equity Method Investee | Somers Holdings Ltd.          
Related Party Transaction [Line Items]          
Net premiums written 738 574      
Reinsurance recoverable for paid and unpaid claims and claims adjustments 1,600 1,300      
Reinsurance balances payable 489 $ 475      
Senior notes $ 35        
Preferred shares, dividend rate (as a percent) 6.50%