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Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (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 | $ 97,688 |  | $ 97,433 |  |  |
Gross Unrealized Gains | 1,311 |  | 1,091 |  |  |
Gross Unrealized Losses | 8,269 |  | 9,767 |  |  |
Allowance for Credit Losses | 48 | $ 39 | 19 | $ 21 | $ 25 | $ 22
Fair Value | 90,682 |  | 88,738 |  |  |
Corporate bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 76,437 |  | 77,085 |  |  |
Gross Unrealized Gains | 1,035 |  | 852 |  |  |
Gross Unrealized Losses | 7,221 |  | 8,272 |  |  |
Allowance for Credit Losses | 17 | 13 | 8 | 9 | 13 | 9
Fair Value | 70,234 |  | 69,657 |  |  |
U.S. government bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 416 |  | 416 |  |  |
Gross Unrealized Gains | 7 |  | 6 |  |  |
Gross Unrealized Losses | 25 |  | 29 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 398 |  | 393 |  |  |
State and municipal bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,848 |  | 3,106 |  |  |
Gross Unrealized Gains | 52 |  | 101 |  |  |
Gross Unrealized Losses | 333 |  | 417 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 2,567 |  | 2,790 |  |  |
Foreign government bonds |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 283 |  | 314 |  |  |
Gross Unrealized Gains | 16 |  | 16 |  |  |
Gross Unrealized Losses | 47 |  | 47 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 252 |  | 283 |  |  |
RMBS |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 2,009 |  | 1,948 |  |  |
Gross Unrealized Gains | 36 |  | 28 |  |  |
Gross Unrealized Losses | 156 |  | 197 |  |  |
Allowance for Credit Losses | 7 | 6 | 6 | 6 | 6 | 7
Fair Value | 1,882 |  | 1,773 |  |  |
CMBS |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 1,766 |  | 1,622 |  |  |
Gross Unrealized Gains | 12 |  | 5 |  |  |
Gross Unrealized Losses | 135 |  | 203 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 1,643 |  | 1,424 |  |  |
ABS |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 13,681 |  | 12,698 |  |  |
Gross Unrealized Gains | 126 |  | 62 |  |  |
Gross Unrealized Losses | 340 |  | 585 |  |  |
Allowance for Credit Losses | 23 | $ 19 | 4 | $ 5 | $ 5 | $ 5
Fair Value | 13,444 |  | 12,171 |  |  |
Hybrid and redeemable preferred securities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Amortized Cost | 248 |  | 244 |  |  |
Gross Unrealized Gains | 27 |  | 21 |  |  |
Gross Unrealized Losses | 12 |  | 17 |  |  |
Allowance for Credit Losses | 1 |  | 1 |  |  |
Fair Value | $ 262 |  | $ 247 |  |  |

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