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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)

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