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Investments in Available-for-sale Fixed Maturity Securities - Gross Unrealized Losses and Fair Value of Available-for-Sale Fixed Maturity Securities (Details)
$ in Millions
Jun. 30, 2024
USD ($)
position
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
position
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Number of Issues            
Less than 12 months | position 1,723   1,682      
12 months or more | position 1,279   2,325      
Total, number of positions | position 3,002   4,007      
Gross Unrealized Losses            
Less than 12 months $ (160)   $ (150)      
12 months or more (491)   (319)      
Total, gross unrealized losses (651)   (469)      
Fair Value            
Less than 12 months 7,729   3,484      
12 months or more 7,179   7,640      
Total, fair value 14,908   11,124      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 37 $ 28 $ 24 $ 32 $ 22 $ 29
U.S. treasury and government            
Number of Issues            
Less than 12 months | position 18   17      
12 months or more | position 15   35      
Total, number of positions | position 33   52      
Gross Unrealized Losses            
Less than 12 months $ 0   $ (1)      
12 months or more (2)   0      
Total, gross unrealized losses (2)   (1)      
Fair Value            
Less than 12 months 23   27      
12 months or more 48   25      
Total, fair value 71   52      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0   $ 0      
U.S. states and political subdivisions            
Number of Issues            
Less than 12 months | position 178   214      
12 months or more | position 162   142      
Total, number of positions | position 340   356      
Gross Unrealized Losses            
Less than 12 months $ (11)   $ (3)      
12 months or more (14)   (14)      
Total, gross unrealized losses (25)   (17)      
Fair Value            
Less than 12 months 283   219      
12 months or more 305   285      
Total, fair value 588   504      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0   $ 0      
Foreign governments            
Number of Issues            
Less than 12 months | position 3   0      
12 months or more | position 1   2      
Total, number of positions | position 4   2      
Gross Unrealized Losses            
Less than 12 months $ 0   $ 0      
12 months or more 0   0      
Total, gross unrealized losses 0   0      
Fair Value            
Less than 12 months 16   0      
12 months or more 9   9      
Total, fair value 25   9      
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 992   1,343      
12 months or more | position 1,027   1,906      
Total, number of positions | position 2,019   3,249      
Gross Unrealized Losses            
Less than 12 months $ (114)   $ (141)      
12 months or more (464)   (279)      
Total, gross unrealized losses (578)   (420)      
Fair Value            
Less than 12 months 3,772   2,941      
12 months or more 6,450   6,475      
Total, fair value 10,222   9,416      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 34 24 $ 19 22 12 24
Residential mortgage-backed securities            
Number of Issues            
Less than 12 months | position 59   6      
12 months or more | position 35   39      
Total, number of positions | position 94   45      
Gross Unrealized Losses            
Less than 12 months $ (4)   $ (1)      
12 months or more (4)   (3)      
Total, gross unrealized losses (8)   (4)      
Fair Value            
Less than 12 months 82   39      
12 months or more 75   64      
Total, fair value 157   103      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 1 1 $ 1 1 0 0
Commercial mortgage-backed securities            
Number of Issues            
Less than 12 months | position 124   0      
12 months or more | position 0   0      
Total, number of positions | position 124   0      
Gross Unrealized Losses            
Less than 12 months $ (17)   $ 0      
12 months or more 0   0      
Total, gross unrealized losses (17)   0      
Fair Value            
Less than 12 months 846   0      
12 months or more 0   0      
Total, fair value 846   0      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 0 0 $ 0 0 0 0
Collateralized debt securities            
Number of Issues            
Less than 12 months | position 349   102      
12 months or more | position 39   201      
Total, number of positions | position 388   303      
Gross Unrealized Losses            
Less than 12 months $ (14)   $ (4)      
12 months or more (7)   (23)      
Total, gross unrealized losses (21)   (27)      
Fair Value            
Less than 12 months 2,707   258      
12 months or more 292   782      
Total, fair value 2,999   1,040      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 2 $ 3 $ 4 $ 9 $ 10 $ 5