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Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 98,529 |  | $ 97,415 |  |  |
Gross Unrealized Gains | 921 |  | 747 |  |  |
Gross Unrealized Losses | 9,979 |  | 11,005 |  |  |
Allowance for Credit Losses | 85 | $ 74 | 46 | $ 39 | $ 21 | $ 19
Fair Value | 89,386 |  | 87,111 |  |  |
Corporate bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 75,551 |  | 75,556 |  |  |
Gross Unrealized Gains | 706 |  | 563 |  |  |
Gross Unrealized Losses | 8,849 |  | 9,655 |  |  |
Allowance for Credit Losses | 36 | 23 | 14 | 13 | 10 | 8
Fair Value | 67,372 |  | 66,450 |  |  |
U.S. government bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 591 |  | 429 |  |  |
Gross Unrealized Gains | 6 |  | 3 |  |  |
Gross Unrealized Losses | 34 |  | 41 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 563 |  | 391 |  |  |
State and municipal bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,663 |  | 2,798 |  |  |
Gross Unrealized Gains | 17 |  | 18 |  |  |
Gross Unrealized Losses | 426 |  | 445 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 2,254 |  | 2,371 |  |  |
Foreign government bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 281 |  | 282 |  |  |
Gross Unrealized Gains | 13 |  | 11 |  |  |
Gross Unrealized Losses | 55 |  | 56 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 239 |  | 237 |  |  |
RMBS |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,217 |  | 2,066 |  |  |
Gross Unrealized Gains | 30 |  | 24 |  |  |
Gross Unrealized Losses | 179 |  | 220 |  |  |
Allowance for Credit Losses | 5 | 6 | 7 | 6 | 6 | 6
Fair Value | 2,063 |  | 1,863 |  |  |
CMBS |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,080 |  | 1,817 |  |  |
Gross Unrealized Gains | 10 |  | 4 |  |  |
Gross Unrealized Losses | 118 |  | 156 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 1,972 |  | 1,665 |  |  |
ABS |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 14,892 |  | 14,226 |  |  |
Gross Unrealized Gains | 116 |  | 99 |  |  |
Gross Unrealized Losses | 307 |  | 421 |  |  |
Allowance for Credit Losses | 43 | $ 44 | 24 | $ 19 | $ 4 | $ 4
Fair Value | 14,658 |  | 13,880 |  |  |
Hybrid and redeemable preferred securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 254 |  | 241 |  |  |
Gross Unrealized Gains | 23 |  | 25 |  |  |
Gross Unrealized Losses | 11 |  | 11 |  |  |
Allowance for Credit Losses | 1 |  | 1 |  |  |
Fair Value | $ 265 |  | $ 254 |  |  |

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