v3.26.1
Investments - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]            
Percent of Total 100.00%   100.00%      
Amortized Cost $ 7,147   $ 6,572      
Allowance for Credit Losses (72) $ (63) (54) $ (47) $ (45) $ (60)
Gross Unrealized Gains 80   135      
Gross Unrealized Losses (338)   (284)      
Fixed-maturity securities, available for sale $ 6,817   $ 6,369      
Government agency obligations as a percentage of total mortgage backed securities 71.00%   75.00%      
Obligations of state and political subdivisions            
Schedule of Investments [Line Items]            
Percent of Total 21.00%   28.00%      
Amortized Cost $ 1,523   $ 1,816      
Allowance for Credit Losses (13)   (13)      
Gross Unrealized Gains 30   37      
Gross Unrealized Losses (71)   (71)      
Fixed-maturity securities, available for sale $ 1,469   $ 1,769      
U.S. government and agencies            
Schedule of Investments [Line Items]            
Percent of Total 1.00%   1.00%      
Amortized Cost $ 49   $ 55      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 1   1      
Gross Unrealized Losses (5)   (4)      
Fixed-maturity securities, available for sale $ 45   $ 52      
Corporate securities            
Schedule of Investments [Line Items]            
Percent of Total 50.00%   46.00%      
Amortized Cost $ 3,556   $ 2,998      
Allowance for Credit Losses (7)   (6)      
Gross Unrealized Gains 35   75      
Gross Unrealized Losses (145)   (115)      
Fixed-maturity securities, available for sale $ 3,439   $ 2,952      
RMBS            
Schedule of Investments [Line Items]            
Percent of Total 11.00%   10.00%      
Amortized Cost $ 781   $ 678      
Allowance for Credit Losses (28)   (26)      
Gross Unrealized Gains 6   10      
Gross Unrealized Losses (33)   (47)      
Fixed-maturity securities, available for sale $ 726   $ 615      
CMBS            
Schedule of Investments [Line Items]            
Percent of Total 4.00%   3.00%      
Amortized Cost $ 284   $ 197      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 1   2      
Gross Unrealized Losses (3)   (1)      
Fixed-maturity securities, available for sale $ 282   $ 198      
CLOs            
Schedule of Investments [Line Items]            
Percent of Total 7.00%   7.00%      
Amortized Cost $ 485   $ 499      
Allowance for Credit Losses (24)   (9)      
Gross Unrealized Gains 3   4      
Gross Unrealized Losses (63)   (38)      
Fixed-maturity securities, available for sale $ 401   $ 456      
Others            
Schedule of Investments [Line Items]            
Percent of Total 3.00%   3.00%      
Amortized Cost $ 238   $ 206      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 3   3      
Gross Unrealized Losses (1)   0      
Fixed-maturity securities, available for sale 240   209      
Others | Affiliated Entity            
Schedule of Investments [Line Items]            
Amortized Cost 59   53      
Fixed-maturity securities, available for sale $ 62   $ 54      
Non-U.S. government securities            
Schedule of Investments [Line Items]            
Percent of Total 3.00%   2.00%      
Amortized Cost $ 231   $ 123      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 1   3      
Gross Unrealized Losses (17)   (8)      
Fixed-maturity securities, available for sale $ 215   $ 118