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Available-For-Sale Fixed Maturity Securities - Amortized Cost and Fair Value of Available-for-Sale Fixed Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 43,949 |  | $ 13,281 |  |  |
Gross Unrealized Gains | 1,983 |  | 89 |  |  |
Gross Unrealized Losses | (227) |  | (469) |  |  |
Allowance for Credit Losses | (22) | $ (37) | (24) | $ (16) | $ (32) | $ (29)
Fair Value | 45,683 |  | 12,877 |  |  |
U.S. treasury and government |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 78 |  | 63 |  |  |
Gross Unrealized Gains | 1 |  | 0 |  |  |
Gross Unrealized Losses | (1) |  | (1) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 78 |  | 62 |  |  |
U.S. states and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 3,184 |  | 594 |  |  |
Gross Unrealized Gains | 212 |  | 1 |  |  |
Gross Unrealized Losses | (13) |  | (17) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 3,383 |  | 578 |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 398 |  | 9 |  |  |
Gross Unrealized Gains | 31 |  | 0 |  |  |
Gross Unrealized Losses | 0 |  | 0 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 429 |  | 9 |  |  |
Corporate debt securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 30,183 |  | 11,144 |  |  |
Gross Unrealized Gains | 1,492 |  | 79 |  |  |
Gross Unrealized Losses | (182) |  | (420) |  |  |
Allowance for Credit Losses | (20) | (34) | (19) | (10) | (22) | (24)
Fair Value | 31,473 |  | 10,784 |  |  |
Residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 1,067 |  | 131 |  |  |
Gross Unrealized Gains | 57 |  | 0 |  |  |
Gross Unrealized Losses | (3) |  | (4) |  |  |
Allowance for Credit Losses | (1) | (1) | (1) | (1) | (1) | 0
Fair Value | 1,120 |  | 126 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,710 |  | 0 |  |  |
Gross Unrealized Gains | 94 |  | 0 |  |  |
Gross Unrealized Losses | (12) |  | 0 |  |  |
Allowance for Credit Losses | 0 | 0 | 0 | 0 | 0 | 0
Fair Value | 2,792 |  | 0 |  |  |
Collateralized debt securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 6,329 |  | 1,340 |  |  |
Gross Unrealized Gains | 96 |  | 9 |  |  |
Gross Unrealized Losses | (16) |  | (27) |  |  |
Allowance for Credit Losses | (1) | $ (2) | (4) | $ (5) | $ (9) | $ (5)
Fair Value | $ 6,408 |  | $ 1,318 |  |  |

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