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Investments - Investment Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Investments |  |  |
Investments | $ 2,310 | $ 3,012 |
Securities sold, not yet purchased, at fair value | 1,373 | 3,473 |
Investment Segment |  |  |
Schedule of Investments |  |  |
Investments | 2,272 | 2,898 |
Securities sold, not yet purchased, at fair value | 1,373 | 3,473 |
Portion of unrealized (losses) gains that relates to equity and debt securities still held | 187 | 302 | $ 1,544
Investment Segment | Equity securities |  |  |
Schedule of Investments |  |  |
Equity securities | 2,241 | 2,611 |
Securities sold, not yet purchased, at fair value | 1,153 | 3,288 |
Investment Segment | Communications |  |  |
Schedule of Investments |  |  |
Equity securities | 129 |  |
Investment Segment | Consumer, cyclical |  |  |
Schedule of Investments |  |  |
Equity securities | 277 | 260 |
Securities sold, not yet purchased, at fair value |  | 3 |
Investment Segment | Consumer, non-cyclical |  |  |
Schedule of Investments |  |  |
Securities sold, not yet purchased, at fair value |  | 41 |
Investment Segment | Energy |  |  |
Schedule of Investments |  |  |
Equity securities | 57 | 708 |
Securities sold, not yet purchased, at fair value | 460 | 2,146 |
Investment Segment | Utilities |  |  |
Schedule of Investments |  |  |
Equity securities | 792 | 1,012 |
Securities sold, not yet purchased, at fair value | 453 | 610 |
Investment Segment | Healthcare |  |  |
Schedule of Investments |  |  |
Equity securities | 482 | 440 |
Investment Segment | Technology |  |  |
Schedule of Investments |  |  |
Equity securities |  | 139 |
Investment Segment | Materials |  |  |
Schedule of Investments |  |  |
Equity securities | 317 | 52 |
Securities sold, not yet purchased, at fair value | 133 | 350 |
Investment Segment | Industrial |  |  |
Schedule of Investments |  |  |
Equity securities | 187 |  |
Securities sold, not yet purchased, at fair value | 107 | 138 |
Investment Segment | Debt securities |  |  |
Schedule of Investments |  |  |
Debt Securities | 31 | 287 |
Securities sold, not yet purchased, at fair value | 220 | 185 |
Investment Segment | Financials |  |  |
Schedule of Investments |  |  |
Debt Securities |  | 158 |
Investment Segment | Real Estate |  |  |
Schedule of Investments |  |  |
Debt Securities | 31 | 44 |
Investment Segment | Communications |  |  |
Schedule of Investments |  |  |
Debt Securities |  | 85 |
Securities sold, not yet purchased, at fair value | $ 220 |  |
Investment Segment | Materials |  |  |
Schedule of Investments |  |  |
Securities sold, not yet purchased, at fair value |  | $ 185 |

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