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SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]        
Other assets   $ 941,000,000 $ 930,000,000  
Other income (expense)   (14,000,000) (102,000,000) $ 37,000,000
Subordinated Debt   218,000,000 218,000,000  
Parent Company        
Debt Instrument [Line Items]        
Issuance of long term notes receivable - affiliated $ 100,000,000 100,000,000 0 0
Long-term note, stated interest rate 3.72%      
Proceeds from repayment of long term notes receivable - affiliated   50,000,000 0 0
Long-term notes receivable, affiliated   50,000,000 0  
Other assets   46,000,000 43,000,000  
Other income (expense)   8,000,000 0 0
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%    
Subordinated Debt   $ 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%    
Subordinated Debt   $ 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%    
Subordinated Debt   $ 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%    
Subordinated Debt   $ 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%    
Subordinated Debt   $ 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%  
Mt Logan Re        
Debt Instrument [Line Items]        
Other assets   46,000,000 $ 65,000,000  
Other income (expense)   $ 8,500,000 $ (900,000) $ (1,300,000)