v3.25.4
SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2024
Sep. 30, 2023
May 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Aug. 31, 2021
Dec. 31, 2019
Debt Instrument [Line Items]                    
Long-term notes       $ 218,000,000 $ 218,000,000          
Commitment       1,600,000,000            
Other assets       1,372,000,000 1,171,000,000          
Other income (expense)       (45,000,000) 121,000,000 $ (14,000,000)        
Other operating income, sale of assets       68,000,000            
Parent Company                    
Debt Instrument [Line Items]                    
Issuance of long term notes receivable - affiliated     $ 100,000,000 0 600,000,000 100,000,000        
Long-term note, stated interest rate     3.72%              
Proceeds from repayment of long term notes receivable - affiliated $ 50,000,000 $ 50,000,000   0 50,000,000 50,000,000        
Other assets       40,000,000 37,000,000          
Other income (expense)       74,000,000 7,000,000 8,000,000        
Parent Company | Affiliated Entity                    
Debt Instrument [Line Items]                    
Issuance of long term notes receivable - affiliated         $ 600,000,000          
Long-term note, stated interest rate         4.30%          
Parent Company | Affiliated Entity | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Commitment         $ 1,500,000,000          
Parent Company | Notes Payable Affiliated | 1.69% Matures December 2028 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount                   $ 300,000,000
Debt instrument, stated interest rate (in percent)                   1.69%
Long-term notes           0        
Parent Company | Notes Payable Affiliated | 1.00% Matures August 2030 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount                 $ 200,000,000  
Debt instrument, stated interest rate (in percent)                 1.00%  
Long-term notes           0        
Parent Company | Notes Payable Affiliated | 3.11% Matures June 2052 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount               $ 215,000,000    
Debt instrument, stated interest rate (in percent)               3.11%    
Long-term notes           0        
Parent Company | Notes Payable Affiliated | 4.34% Matures June 2052 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount             $ 125,000,000      
Debt instrument, stated interest rate (in percent)             4.34%      
Long-term notes           0        
Parent Company | Notes Payable Affiliated | 4.34% Matures December 2052 - 1 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount             $ 125,000,000      
Debt instrument, stated interest rate (in percent)             4.34%      
Long-term notes           0        
Parent Company | Notes Payable Affiliated | 4.34% Matures December 2052 - 2 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount             $ 1,800,000,000      
Debt instrument, stated interest rate (in percent)             4.34%      
Parent Company | Notes Payable Affiliated | 4.30% Matures December 2027-1 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount         $ 100,000,000          
Debt instrument, stated interest rate (in percent)         4.30%          
Parent Company | Notes Payable Affiliated | 4.30% Matures December 2027-1 | Affiliated Entity | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Commitment         $ 500,000,000          
Parent Company | Notes Payable Affiliated | 4.30% Matures December 2027-2 | Affiliated Entity                    
Debt Instrument [Line Items]                    
Debt instrument face amount         $ 300,000,000          
Debt instrument, stated interest rate (in percent)         4.30%          
Proceeds from related party debt       175,000,000            
Repayments of debt       275,000,000            
Long-Term Debt       200,000,000            
Parent Company | Notes Payable Affiliated | 4.30% Matures December 2027-2 | Affiliated Entity | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Commitment         $ 1,000,000,000.0          
Mt Logan Re                    
Debt Instrument [Line Items]                    
Other assets       35,000,000 39,000,000          
Other income (expense)       $ 7,000,000 $ 8,000,000 $ 8,000,000