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Investments in Available-for-sale Fixed Maturity Securities - Amortized Cost and Fair Value of Available-for-Sale Fixed Maturity 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] |  |  |  |  |  |
Amortized Cost | $ 46,480 |  | $ 13,281 |  |  |
Gross Unrealized Gains | 688 |  | 89 |  |  |
Gross Unrealized Losses | (651) |  | (469) |  |  |
Allowance for Credit Losses | (37) | $ (28) | (24) | $ (32) | $ (22) | $ (29)
Available-for-sale fixed maturity securities, at fair value | 46,480 |  | 12,877 |  |  |
U.S. treasury and government |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 85 |  | 63 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (2) |  | (1) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Available-for-sale fixed maturity securities, at fair value | 83 |  | 62 |  |  |
U.S. states and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 3,240 |  | 594 |  |  |
Gross Unrealized Gains | 84 |  | 1 |  |  |
Gross Unrealized Losses | (25) |  | (17) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Available-for-sale fixed maturity securities, at fair value | 3,299 |  | 578 |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 441 |  | 9 |  |  |
Gross Unrealized Gains | 12 |  | 0 |  |  |
Gross Unrealized Losses | 0 |  | 0 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Available-for-sale fixed maturity securities, at fair value | 453 |  | 9 |  |  |
Corporate debt securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 32,080 |  | 11,144 |  |  |
Gross Unrealized Gains | 481 |  | 79 |  |  |
Gross Unrealized Losses | (578) |  | (420) |  |  |
Allowance for Credit Losses | (34) | (24) | (19) | (22) | (12) | (24)
Available-for-sale fixed maturity securities, at fair value | 31,949 |  | 10,784 |  |  |
Residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 1,067 |  | 131 |  |  |
Gross Unrealized Gains | 21 |  | 0 |  |  |
Gross Unrealized Losses | (8) |  | (4) |  |  |
Allowance for Credit Losses | (1) | (1) | (1) | (1) | 0 | 0
Available-for-sale fixed maturity securities, at fair value | 1,079 |  | 126 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,744 |  | 0 |  |  |
Gross Unrealized Gains | 39 |  | 0 |  |  |
Gross Unrealized Losses | (17) |  | 0 |  |  |
Allowance for Credit Losses | 0 | 0 | 0 | 0 | 0 | 0
Available-for-sale fixed maturity securities, at fair value | 2,766 |  | 0 |  |  |
Collateralized debt securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 6,823 |  | 1,340 |  |  |
Gross Unrealized Gains | 51 |  | 9 |  |  |
Gross Unrealized Losses | (21) |  | (27) |  |  |
Allowance for Credit Losses | (2) | $ (3) | (4) | $ (9) | $ (10) | $ (5)
Available-for-sale fixed maturity securities, at fair value | $ 6,851 |  | $ 1,318 |  |  |

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