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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, 2024
USD ($)
position
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
position
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Number of Issues            
Less than 12 months | position 755   1,682      
12 months or more | position 1,007   2,325      
Total, Number of Issues | position 1,762   4,007      
Gross Unrealized Losses            
Less than 12 months $ (100)   $ (150)      
12 months or more (127)   (319)      
Total, Gross Unrealized Losses (227)   (469)      
Fair Value            
Less than 12 months 5,066   3,484      
12 months or more 5,875   7,640      
Total, Fair Value 10,941   11,124      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 22 $ 37 $ 24 $ 16 $ 32 $ 29
U.S. treasury and government            
Number of Issues            
Less than 12 months | position 19   17      
12 months or more | position 8   35      
Total, Number of Issues | position 27   52      
Gross Unrealized Losses            
Less than 12 months $ (1)   $ (1)      
12 months or more 0   0      
Total, Gross Unrealized Losses (1)   (1)      
Fair Value            
Less than 12 months 17   27      
12 months or more 36   25      
Total, Fair Value 53   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 92   214      
12 months or more | position 166   142      
Total, Number of Issues | position 258   356      
Gross Unrealized Losses            
Less than 12 months $ (6)   $ (3)      
12 months or more (7)   (14)      
Total, Gross Unrealized Losses (13)   (17)      
Fair Value            
Less than 12 months 178   219      
12 months or more 309   285      
Total, Fair Value 487   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 0   0      
12 months or more | position 1   2      
Total, Number of Issues | position 1   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 0   0      
12 months or more 5   9      
Total, Fair Value 5   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 248   1,343      
12 months or more | position 777   1,906      
Total, Number of Issues | position 1,025   3,249      
Gross Unrealized Losses            
Less than 12 months $ (67)   $ (141)      
12 months or more (115)   (279)      
Total, Gross Unrealized Losses (182)   (420)      
Fair Value            
Less than 12 months 2,732   2,941      
12 months or more 5,287   6,475      
Total, Fair Value 8,019   9,416      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 20 34 $ 19 10 22 24
Residential mortgage-backed securities            
Number of Issues            
Less than 12 months | position 15   6      
12 months or more | position 33   39      
Total, Number of Issues | position 48   45      
Gross Unrealized Losses            
Less than 12 months $ (1)   $ (1)      
12 months or more (2)   (3)      
Total, Gross Unrealized Losses (3)   (4)      
Fair Value            
Less than 12 months 30   39      
12 months or more 73   64      
Total, Fair Value 103   103      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 1 1 $ 1 1 1 0
Commercial mortgage-backed securities            
Number of Issues            
Less than 12 months | position 115   0      
12 months or more | position 0   0      
Total, Number of Issues | position 115   0      
Gross Unrealized Losses            
Less than 12 months $ (12)   $ 0      
12 months or more 0   0      
Total, Gross Unrealized Losses (12)   0      
Fair Value            
Less than 12 months 589   0      
12 months or more 0   0      
Total, Fair Value 589   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 266   102      
12 months or more | position 22   201      
Total, Number of Issues | position 288   303      
Gross Unrealized Losses            
Less than 12 months $ (13)   $ (4)      
12 months or more (3)   (23)      
Total, Gross Unrealized Losses (16)   (27)      
Fair Value            
Less than 12 months 1,520   258      
12 months or more 165   782      
Total, Fair Value 1,685   1,040      
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 1 $ 2 $ 4 $ 5 $ 9 $ 5