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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 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 25, 2022 | May 24, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 47,127 | $ 13,281 |  |  |  |
Gross Unrealized Gains | 664 | 89 |  |  |  |
Gross Unrealized Losses | (472) | (469) |  |  |  |
Allowance for Credit Losses | (27) | (24) | $ (29) | $ 0 | $ (32) | $ (10)
Fair Value | 47,292 | 12,877 |  |  |  |
U.S. treasury and government |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 87 | 63 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | (1) | (1) |  |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |  |
Fair Value | 86 | 62 |  |  |  |
U.S. states and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 3,200 | 594 |  |  |  |
Gross Unrealized Gains | 37 | 1 |  |  |  |
Gross Unrealized Losses | (30) | (17) |  |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |  |
Fair Value | 3,207 | 578 |  |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 1,568 | 9 |  |  |  |
Gross Unrealized Gains | 6 | 0 |  |  |  |
Gross Unrealized Losses | (33) | 0 |  |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |  |
Fair Value | 1,541 | 9 |  |  |  |
Corporate debt securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 32,770 | 11,144 |  |  |  |
Gross Unrealized Gains | 454 | 79 |  |  |  |
Gross Unrealized Losses | (350) | (420) |  |  |  |
Allowance for Credit Losses | (26) | (19) | (24) | 0 | (28) | (7)
Fair Value | 32,848 | 10,784 |  |  |  |
Residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 1,086 | 131 |  |  |  |
Gross Unrealized Gains | 25 | 0 |  |  |  |
Gross Unrealized Losses | (4) | (4) |  |  |  |
Allowance for Credit Losses | (1) | (1) | 0 | 0 | 0 | 0
Fair Value | 1,106 | 126 |  |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,755 | 0 |  |  |  |
Gross Unrealized Gains | 65 | 0 |  |  |  |
Gross Unrealized Losses | (24) | 0 |  |  |  |
Allowance for Credit Losses | 0 | 0 | 0 | 0 | 0 | 0
Fair Value | 2,796 | 0 |  |  |  |
Collateralized debt securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 5,661 | 1,340 |  |  |  |
Gross Unrealized Gains | 77 | 9 |  |  |  |
Gross Unrealized Losses | (30) | (27) |  |  |  |
Allowance for Credit Losses | 0 | (4) | $ (5) | $ 0 | $ (4) | $ (3)
Fair Value | $ 5,708 | $ 1,318 |  |  |  |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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