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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

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