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Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | $ 97,415 | $ 97,433 |  |
Gross Unrealized Gains | 747 | 1,091 |  |
Gross Unrealized Losses | 11,005 | 9,767 |  |
Allowance for Credit Losses | 46 | 19 | $ 22 | $ 19
Fair Value | 87,111 | 88,738 |  |
Corporate bonds |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 75,556 | 77,085 |  |
Gross Unrealized Gains | 563 | 852 |  |
Gross Unrealized Losses | 9,655 | 8,272 |  |
Allowance for Credit Losses | 14 | 8 | 9 | 17
Fair Value | 66,450 | 69,657 |  |
U.S. government bonds |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 429 | 416 |  |
Gross Unrealized Gains | 3 | 6 |  |
Gross Unrealized Losses | 41 | 29 |  |
Allowance for Credit Losses | 0 | 0 |  |
Fair Value | 391 | 393 |  |
State and municipal bonds |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 2,798 | 3,106 |  |
Gross Unrealized Gains | 18 | 101 |  |
Gross Unrealized Losses | 445 | 417 |  |
Allowance for Credit Losses | 0 | 0 |  |
Fair Value | 2,371 | 2,790 |  |
Foreign government bonds |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 282 | 314 |  |
Gross Unrealized Gains | 11 | 16 |  |
Gross Unrealized Losses | 56 | 47 |  |
Allowance for Credit Losses | 0 | 0 |  |
Fair Value | 237 | 283 |  |
RMBS |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 2,066 | 1,948 |  |
Gross Unrealized Gains | 24 | 28 |  |
Gross Unrealized Losses | 220 | 197 |  |
Allowance for Credit Losses | 7 | 6 | 7 | 1
Fair Value | 1,863 | 1,773 |  |
CMBS |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 1,817 | 1,622 |  |
Gross Unrealized Gains | 4 | 5 |  |
Gross Unrealized Losses | 156 | 203 |  |
Allowance for Credit Losses | 0 | 0 |  |
Fair Value | 1,665 | 1,424 |  |
ABS |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 14,226 | 12,698 |  |
Gross Unrealized Gains | 99 | 62 |  |
Gross Unrealized Losses | 421 | 585 |  |
Allowance for Credit Losses | 24 | 4 | $ 5 | $ 1
Fair Value | 13,880 | 12,171 |  |
Hybrid and redeemable preferred securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Amortized Cost | 241 | 244 |  |
Gross Unrealized Gains | 25 | 21 |  |
Gross Unrealized Losses | 11 | 17 |  |
Allowance for Credit Losses | 1 | 1 |  |
Fair Value | $ 254 | $ 247 |  |

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