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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

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