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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, 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        
Other assets       1,171,000,000 941,000,000        
Other income (expense)       121,000,000 (14,000,000) $ (102,000,000)      
Parent Company                  
Debt Instrument [Line Items]                  
Issuance of long term notes receivable - affiliated     $ 100,000,000 600,000,000 100,000,000 0      
Long-term note, stated interest rate     3.72%            
Proceeds from repayment of long term notes receivable - affiliated $ 50,000,000 $ 50,000,000   50,000,000 50,000,000 0      
Long-term notes receivable, affiliated       600,000,000 50,000,000        
Other assets       37,000,000 46,000,000        
Other income (expense)       7,000,000 8,000,000 0      
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 | 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                 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               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             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           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           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           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       4.30%          
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       4.30%          
Mt Logan Re                  
Debt Instrument [Line Items]                  
Other assets       $ 39,000,000 46,000,000        
Other income (expense)       $ 8,000,000 $ 8,000,000 $ (1,000,000)