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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
Jun. 30, 2025
USD ($)
position
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
position
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Number of Issues            
Less than 12 months | position 992   2,028      
12 months or more | position 403   596      
Total, Number of Issues | position 1,395   2,624      
Gross Unrealized Losses            
Less than 12 months $ (202)   $ (274)      
12 months or more (163)   (198)      
Total, Gross Unrealized Losses (365)   (472)      
Fair Value            
Less than 12 months 7,979   10,728      
12 months or more 3,947   4,414      
Total, Fair Value 11,926   15,142      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 2 $ 11 $ 27 $ 37 $ 28 $ 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 (1)   (1)      
Total, Gross Unrealized Losses (1)   (1)      
Fair Value            
Less than 12 months 8   29      
12 months or more 51   36      
Total, Fair Value 59   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 140   174      
12 months or more | position 93   190      
Total, Number of Issues | position 233   364      
Gross Unrealized Losses            
Less than 12 months $ (17)   $ (20)      
12 months or more (18)   (10)      
Total, Gross Unrealized Losses (35)   (30)      
Fair Value            
Less than 12 months 788   851      
12 months or more 222   280      
Total, Fair Value 1,010   1,131      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0   $ 0      
Foreign governments            
Number of Issues            
Less than 12 months | position 9   8      
12 months or more | position 2   0      
Total, Number of Issues | position 11   8      
Gross Unrealized Losses            
Less than 12 months $ (13)   $ (33)      
12 months or more 0   0      
Total, Gross Unrealized Losses (13)   (33)      
Fair Value            
Less than 12 months 452   1,206      
12 months or more 25   0      
Total, Fair Value 477   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 633   1,514      
12 months or more | position 267   384      
Total, Number of Issues | position 900   1,898      
Gross Unrealized Losses            
Less than 12 months $ (118)   $ (165)      
12 months or more (99)   (185)      
Total, Gross Unrealized Losses (217)   (350)      
Fair Value            
Less than 12 months 4,706   6,615      
12 months or more 3,024   4,015      
Total, Fair Value 7,730   10,630      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 1 9 $ 26 34 24 19
Residential mortgage-backed securities            
Number of Issues            
Less than 12 months | position 38   47      
12 months or more | position 4   16      
Total, Number of Issues | position 42   63      
Gross Unrealized Losses            
Less than 12 months $ (1)   $ (3)      
12 months or more (1)   (1)      
Total, Gross Unrealized Losses (2)   (4)      
Fair Value            
Less than 12 months 138   178      
12 months or more 21   61      
Total, Fair Value 159   239      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0 1 $ 1 1 1 1
Commercial mortgage-backed securities            
Number of Issues            
Less than 12 months | position 47   104      
12 months or more | position 15   0      
Total, Number of Issues | position 62   104      
Gross Unrealized Losses            
Less than 12 months $ (26)   $ (24)      
12 months or more (9)   0      
Total, Gross Unrealized Losses (35)   (24)      
Fair Value            
Less than 12 months 481   667      
12 months or more 137   0      
Total, Fair Value 618   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 124   178      
12 months or more | position 19   5      
Total, Number of Issues | position 143   183      
Gross Unrealized Losses            
Less than 12 months $ (27)   $ (29)      
12 months or more (35)   (1)      
Total, Gross Unrealized Losses (62)   (30)      
Fair Value            
Less than 12 months 1,406   1,182      
12 months or more 467   22      
Total, Fair Value 1,873   1,204      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 1 $ 1 $ 0 $ 2 $ 3 $ 4