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Available-For-Sale Fixed Maturity Securities - Gross Unrealized Losses and Fair Value of Available-for-Sale Fixed Maturity Securities (Details)
$ in Millions
Sep. 30, 2025
USD ($)
position
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
position
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Number of Issues            
Less than 12 months | position 796   2,028      
12 months or more | position 395   596      
Total, Number of Issues | position 1,191   2,624      
Gross Unrealized Losses            
Less than 12 months $ (68)   $ (274)      
12 months or more (134)   (198)      
Total, Gross Unrealized Losses (202)   (472)      
Fair Value            
Less than 12 months 5,025   10,728      
12 months or more 3,499   4,414      
Total, Fair Value 8,524   15,142      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 3 $ 2 $ 27 $ 22 $ 37 $ 24
U.S. treasury and government            
Number of Issues            
Less than 12 months | position 1   3      
12 months or more | position 3   1      
Total, Number of Issues | position 4   4      
Gross Unrealized Losses            
Less than 12 months $ 0   $ 0      
12 months or more 0   (1)      
Total, Gross Unrealized Losses 0   (1)      
Fair Value            
Less than 12 months 3   29      
12 months or more 55   36      
Total, Fair Value 58   65      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0   $ 0      
U.S. state and municipal            
Number of Issues            
Less than 12 months | position 77   174      
12 months or more | position 84   190      
Total, Number of Issues | position 161   364      
Gross Unrealized Losses            
Less than 12 months $ (4)   $ (20)      
12 months or more (17)   (10)      
Total, Gross Unrealized Losses (21)   (30)      
Fair Value            
Less than 12 months 277   851      
12 months or more 243   280      
Total, Fair Value 520   1,131      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 3   $ 0      
Foreign governments            
Number of Issues            
Less than 12 months | position 5   8      
12 months or more | position 2   0      
Total, Number of Issues | position 7   8      
Gross Unrealized Losses            
Less than 12 months $ (4)   $ (33)      
12 months or more 0   0      
Total, Gross Unrealized Losses (4)   (33)      
Fair Value            
Less than 12 months 191   1,206      
12 months or more 14   0      
Total, Fair Value 205   1,206      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0   $ 0      
Corporate debt securities            
Number of Issues            
Less than 12 months | position 560   1,514      
12 months or more | position 241   384      
Total, Number of Issues | position 801   1,898      
Gross Unrealized Losses            
Less than 12 months $ (29)   $ (165)      
12 months or more (75)   (185)      
Total, Gross Unrealized Losses (104)   (350)      
Fair Value            
Less than 12 months 3,230   6,615      
12 months or more 2,548   4,015      
Total, Fair Value 5,778   10,630      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0 1 $ 26 20 34 19
Residential mortgage-backed securities            
Number of Issues            
Less than 12 months | position 22   47      
12 months or more | position 16   16      
Total, Number of Issues | position 38   63      
Gross Unrealized Losses            
Less than 12 months $ 0   $ (3)      
12 months or more (2)   (1)      
Total, Gross Unrealized Losses (2)   (4)      
Fair Value            
Less than 12 months 50   178      
12 months or more 97   61      
Total, Fair Value 147   239      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0 0 $ 1 1 1 1
Commercial mortgage-backed securities            
Number of Issues            
Less than 12 months | position 34   104      
12 months or more | position 29   0      
Total, Number of Issues | position 63   104      
Gross Unrealized Losses            
Less than 12 months $ (15)   $ (24)      
12 months or more (17)   0      
Total, Gross Unrealized Losses (32)   (24)      
Fair Value            
Less than 12 months 352   667      
12 months or more 245   0      
Total, Fair Value 597   667      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0   $ 0      
Collateralized debt securities            
Number of Issues            
Less than 12 months | position 97   178      
12 months or more | position 20   5      
Total, Number of Issues | position 117   183      
Gross Unrealized Losses            
Less than 12 months $ (16)   $ (29)      
12 months or more (23)   (1)      
Total, Gross Unrealized Losses (39)   (30)      
Fair Value            
Less than 12 months 922   1,182      
12 months or more 297   22      
Total, Fair Value 1,219   1,204      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0 $ 1 $ 0 $ 1 $ 2 $ 4