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Transactions with Related Parties (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
director
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]        
Purchases of other investments $ 2,238 $ 3,485 $ 2,171  
Net premiums written 16,476 15,732 13,468  
Reinsurance recoverable for paid and unpaid claims and claims adjustments 9,526 8,260 7,064  
Reinsurance balances payable 2,320 2,137    
Other assets 6,796 6,231    
Other liabilities $ 3,517 $ 3,039    
Premia Holdings Ltd        
Related Party Transaction [Line Items]        
Number of directors | director 7      
Greysbridge Holdings Ltd        
Related Party Transaction [Line Items]        
Percentage ownership 30.00% 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      
Funds held asset $ 124 $ 137    
Equity Method Investee | Greysbridge Holdings Ltd        
Related Party Transaction [Line Items]        
Other assets 162      
Other liabilities 162      
Equity Method Investee | Somers Holdings Ltd.        
Related Party Transaction [Line Items]        
Net premiums written 705 738 $ 574  
Reinsurance recoverable for paid and unpaid claims and claims adjustments 2,000 1,600    
Reinsurance balances payable 550 $ 489    
Senior notes $ 35      
Preferred shares, dividend rate (as a percent) 6.50%