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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 43,035 |  | $ 41,726 |  |  |
Allowance for credit losses, fixed maturity, AFS | (19) | $ (18) | (21) | $ (18) | $ (17) | $ (12)
Gross Unrealized Gains, fixed maturities, available-for-sale | 239 |  | 418 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (2,441) |  | (2,305) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 40,814 |  | 39,818 |  |  |
ABS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,041 |  | 3,347 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 11 |  | 18 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (38) |  | (45) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,014 |  | 3,320 |  |  |
Collateralized Loan Obligations [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,507 |  | 3,104 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 8 |  | 3 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) |  | (17) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,514 |  | 3,090 |  |  |
CMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,234 |  | 3,466 |  |  |
Allowance for credit losses, fixed maturity, AFS | (13) | (12) | (12) | (12) | (11) | (10)
Gross Unrealized Gains, fixed maturities, available-for-sale | 22 |  | 19 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (301) |  | (348) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 2,942 |  | 3,125 |  |  |
Corporate |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 20,548 |  | 18,691 |  |  |
Allowance for credit losses, fixed maturity, AFS | (6) | $ (6) | (9) | $ (6) | $ (6) | $ (2)
Gross Unrealized Gains, fixed maturities, available-for-sale | 101 |  | 197 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (1,150) |  | (1,013) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 19,493 |  | 17,866 |  |  |
Foreign Govt./Govt. Agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 569 |  | 583 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 3 |  | 6 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (26) |  | (27) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 546 |  | 562 |  |  |
Municipal |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 5,555 |  | 6,207 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 80 |  | 131 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (341) |  | (299) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 5,294 |  | 6,039 |  |  |
RMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 5,204 |  | 4,675 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 10 |  | 18 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (427) |  | (406) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,787 |  | 4,287 |  |  |
U.S. Treasuries |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,377 |  | 1,653 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 4 |  | 26 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (157) |  | (150) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 1,224 |  | $ 1,529 |  |  |

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