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Investments in Available-for-sale Fixed Maturity Securities - Gross Unrealized Losses and Fair Value of Available-for-Sale Fixed Maturity Securities (Details) $ in Millions | Jun. 30, 2024 USD ($) position | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) position | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | --- | --- | ---
Number of Issues |  |  |  |  |  |
Less than 12 months | position | 1,723 |  | 1,682 |  |  |
12 months or more | position | 1,279 |  | 2,325 |  |  |
Total, number of positions | position | 3,002 |  | 4,007 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ (160) |  | $ (150) |  |  |
12 months or more | (491) |  | (319) |  |  |
Total, gross unrealized losses | (651) |  | (469) |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 7,729 |  | 3,484 |  |  |
12 months or more | 7,179 |  | 7,640 |  |  |
Total, fair value | 14,908 |  | 11,124 |  |  |
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest | $ 37 | $ 28 | $ 24 | $ 32 | $ 22 | $ 29
U.S. treasury and government |  |  |  |  |  |
Number of Issues |  |  |  |  |  |
Less than 12 months | position | 18 |  | 17 |  |  |
12 months or more | position | 15 |  | 35 |  |  |
Total, number of positions | position | 33 |  | 52 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ 0 |  | $ (1) |  |  |
12 months or more | (2) |  | 0 |  |  |
Total, gross unrealized losses | (2) |  | (1) |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 23 |  | 27 |  |  |
12 months or more | 48 |  | 25 |  |  |
Total, fair value | 71 |  | 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 | 178 |  | 214 |  |  |
12 months or more | position | 162 |  | 142 |  |  |
Total, number of positions | position | 340 |  | 356 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ (11) |  | $ (3) |  |  |
12 months or more | (14) |  | (14) |  |  |
Total, gross unrealized losses | (25) |  | (17) |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 283 |  | 219 |  |  |
12 months or more | 305 |  | 285 |  |  |
Total, fair value | 588 |  | 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 | 3 |  | 0 |  |  |
12 months or more | position | 1 |  | 2 |  |  |
Total, number of positions | position | 4 |  | 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 | 16 |  | 0 |  |  |
12 months or more | 9 |  | 9 |  |  |
Total, fair value | 25 |  | 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 | 992 |  | 1,343 |  |  |
12 months or more | position | 1,027 |  | 1,906 |  |  |
Total, number of positions | position | 2,019 |  | 3,249 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ (114) |  | $ (141) |  |  |
12 months or more | (464) |  | (279) |  |  |
Total, gross unrealized losses | (578) |  | (420) |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 3,772 |  | 2,941 |  |  |
12 months or more | 6,450 |  | 6,475 |  |  |
Total, fair value | 10,222 |  | 9,416 |  |  |
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest | $ 34 | 24 | $ 19 | 22 | 12 | 24
Residential mortgage-backed securities |  |  |  |  |  |
Number of Issues |  |  |  |  |  |
Less than 12 months | position | 59 |  | 6 |  |  |
12 months or more | position | 35 |  | 39 |  |  |
Total, number of positions | position | 94 |  | 45 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ (4) |  | $ (1) |  |  |
12 months or more | (4) |  | (3) |  |  |
Total, gross unrealized losses | (8) |  | (4) |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 82 |  | 39 |  |  |
12 months or more | 75 |  | 64 |  |  |
Total, fair value | 157 |  | 103 |  |  |
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest | $ 1 | 1 | $ 1 | 1 | 0 | 0
Commercial mortgage-backed securities |  |  |  |  |  |
Number of Issues |  |  |  |  |  |
Less than 12 months | position | 124 |  | 0 |  |  |
12 months or more | position | 0 |  | 0 |  |  |
Total, number of positions | position | 124 |  | 0 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ (17) |  | $ 0 |  |  |
12 months or more | 0 |  | 0 |  |  |
Total, gross unrealized losses | (17) |  | 0 |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 846 |  | 0 |  |  |
12 months or more | 0 |  | 0 |  |  |
Total, fair value | 846 |  | 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 | 349 |  | 102 |  |  |
12 months or more | position | 39 |  | 201 |  |  |
Total, number of positions | position | 388 |  | 303 |  |  |
Gross Unrealized Losses |  |  |  |  |  |
Less than 12 months | $ (14) |  | $ (4) |  |  |
12 months or more | (7) |  | (23) |  |  |
Total, gross unrealized losses | (21) |  | (27) |  |  |
Fair Value |  |  |  |  |  |
Less than 12 months | 2,707 |  | 258 |  |  |
12 months or more | 292 |  | 782 |  |  |
Total, fair value | 2,999 |  | 1,040 |  |  |
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest | $ 2 | $ 3 | $ 4 | $ 9 | $ 10 | $ 5

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