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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
Dec. 31, 2024
USD ($)
position
Dec. 31, 2023
USD ($)
position
Dec. 31, 2022
USD ($)
May 25, 2022
USD ($)
May 24, 2022
USD ($)
Dec. 31, 2021
USD ($)
Number of Issues            
Less than 12 months | position 2,028 1,682        
12 months or more | position 596 2,325        
Total | position 2,624 4,007        
Gross Unrealized Losses            
Less than 12 months $ (274) $ (150)        
12 months or more (198) (319)        
Total (472) (469)        
Fair Value            
Less than 12 months 10,728 3,484        
12 months or more 4,414 7,640        
Total 15,142 11,124        
Allowance for Credit Losses $ (27) $ (24) $ (29) $ 0 $ (32) $ (10)
U.S. treasury and government            
Number of Issues            
Less than 12 months | position 3 17        
12 months or more | position 1 35        
Total | position 4 52        
Gross Unrealized Losses            
Less than 12 months $ 0 $ (1)        
12 months or more (1) 0        
Total (1) (1)        
Fair Value            
Less than 12 months 29 27        
12 months or more 36 25        
Total 65 52        
Allowance for Credit Losses $ 0 $ 0        
U.S. states and political subdivisions            
Number of Issues            
Less than 12 months | position 174 214        
12 months or more | position 190 142        
Total | position 364 356        
Gross Unrealized Losses            
Less than 12 months $ (20) $ (3)        
12 months or more (10) (14)        
Total (30) (17)        
Fair Value            
Less than 12 months 851 219        
12 months or more 280 285        
Total 1,131 504        
Allowance for Credit Losses $ 0 $ 0        
Foreign governments            
Number of Issues            
Less than 12 months | position 8 0        
12 months or more | position 0 2        
Total | position 8 2        
Gross Unrealized Losses            
Less than 12 months $ (33) $ 0        
12 months or more 0 0        
Total (33) 0        
Fair Value            
Less than 12 months 1,206 0        
12 months or more 0 9        
Total 1,206 9        
Allowance for Credit Losses $ 0 $ 0        
Corporate debt securities            
Number of Issues            
Less than 12 months | position 1,514 1,343        
12 months or more | position 384 1,906        
Total | position 1,898 3,249        
Gross Unrealized Losses            
Less than 12 months $ (165) $ (141)        
12 months or more (185) (279)        
Total (350) (420)        
Fair Value            
Less than 12 months 6,615 2,941        
12 months or more 4,015 6,475        
Total 10,630 9,416        
Allowance for Credit Losses $ (26) $ (19) (24) 0 (28) (7)
Residential mortgage-backed securities            
Number of Issues            
Less than 12 months | position 47 6        
12 months or more | position 16 39        
Total | position 63 45        
Gross Unrealized Losses            
Less than 12 months $ (3) $ (1)        
12 months or more (1) (3)        
Total (4) (4)        
Fair Value            
Less than 12 months 178 39        
12 months or more 61 64        
Total 239 103        
Allowance for Credit Losses $ (1) $ (1) 0 0 0 0
Commercial mortgage-backed securities            
Number of Issues            
Less than 12 months | position 104 0        
12 months or more | position 0 0        
Total | position 104 0        
Gross Unrealized Losses            
Less than 12 months $ (24) $ 0        
12 months or more 0 0        
Total (24) 0        
Fair Value            
Less than 12 months 667 0        
12 months or more 0 0        
Total 667 0        
Allowance for Credit Losses $ 0 $ 0 0 0 0 0
Collateralized debt securities            
Number of Issues            
Less than 12 months | position 178 102        
12 months or more | position 5 201        
Total | position 183 303        
Gross Unrealized Losses            
Less than 12 months $ (29) $ (4)        
12 months or more (1) (23)        
Total (30) (27)        
Fair Value            
Less than 12 months 1,182 258        
12 months or more 22 782        
Total 1,204 1,040        
Allowance for Credit Losses $ 0 $ (4) $ (5) $ 0 $ (4) $ (3)