v3.25.2
Investments - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]            
Percent of Total 100.00%   100.00%      
Amortized Cost $ 6,765   $ 6,827      
Allowance for Credit Losses (47) $ (45) (60) $ (69) $ (67) $ (77)
Gross Unrealized Gains 107   44      
Gross Unrealized Losses (327)   (442)      
Estimated Fair Value $ 6,498   $ 6,369      
Government agency obligations as a percentage of total mortgage backed securities 73.00%   68.00%      
Obligations of state and political subdivisions            
Schedule of Investments [Line Items]            
Percent of Total 27.00%   30.00%      
Amortized Cost $ 1,851   $ 2,032      
Allowance for Credit Losses (12)   (14)      
Gross Unrealized Gains 28   25      
Gross Unrealized Losses (95)   (103)      
Estimated Fair Value $ 1,772   $ 1,940      
U.S. government and agencies            
Schedule of Investments [Line Items]            
Percent of Total 1.00%   1.00%      
Amortized Cost $ 42   $ 72      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 1   1      
Gross Unrealized Losses (5)   (6)      
Estimated Fair Value $ 38   $ 67      
Corporate securities            
Schedule of Investments [Line Items]            
Percent of Total 42.00%   38.00%      
Amortized Cost $ 2,826   $ 2,586      
Allowance for Credit Losses (6)   (7)      
Gross Unrealized Gains 57   9      
Gross Unrealized Losses (131)   (206)      
Estimated Fair Value $ 2,746   $ 2,382      
RMBS            
Schedule of Investments [Line Items]            
Percent of Total 10.00%   9.00%      
Amortized Cost $ 670   $ 657      
Allowance for Credit Losses (24)   (21)      
Gross Unrealized Gains 5   2      
Gross Unrealized Losses (58)   (71)      
Estimated Fair Value $ 593   $ 567      
CMBS            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   3.00%      
Amortized Cost $ 150   $ 189      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 2   0      
Gross Unrealized Losses (1)   (3)      
Estimated Fair Value $ 151   $ 186      
CLOs            
Schedule of Investments [Line Items]            
Percent of Total 8.00%   9.00%      
Amortized Cost $ 554   $ 615      
Allowance for Credit Losses (5)   (1)      
Gross Unrealized Gains 6   6      
Gross Unrealized Losses (28)   (9)      
Estimated Fair Value $ 527   $ 611      
Others            
Schedule of Investments [Line Items]            
Percent of Total 9.00%   9.00%      
Amortized Cost $ 583   $ 593      
Allowance for Credit Losses 0   (17)      
Gross Unrealized Gains 4   1      
Gross Unrealized Losses (1)   (30)      
Estimated Fair Value 586   547      
Others | Affiliated Entity            
Schedule of Investments [Line Items]            
Amortized Cost 41   41      
Estimated Fair Value $ 42   $ 42      
Non-U.S. government securities            
Schedule of Investments [Line Items]            
Percent of Total 1.00%   1.00%      
Amortized Cost $ 89   $ 83      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 4   0      
Gross Unrealized Losses (8)   (14)      
Estimated Fair Value $ 85   $ 69