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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Schedule of Investments |  |  |  |  |
Investments | $ 2,306 |  | $ 2,306 |  | $ 3,012
Securities sold, not yet purchased, at fair value | 2,128 |  | 2,128 |  | 3,473
Investment Segment |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 2,196 |  | 2,196 |  | 2,898
Securities sold, not yet purchased, at fair value | 2,128 |  | 2,128 |  | 3,473
Portion of unrealized (losses) gains that relates to equity and debt securities still held | (86) | $ (69) | (360) | $ (124) |
Investment Segment | Equity securities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 2,167 |  | 2,167 |  | 2,611
Securities sold, not yet purchased, at fair value | 2,065 |  | 2,065 |  | 3,288
Investment Segment | Communications |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 20 |  | 20 |  |
Investment Segment | Consumer, non-cyclical |  |  |  |  |
Schedule of Investments |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  | 41
Investment Segment | Consumer, cyclical |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 304 |  | 304 |  | 260
Securities sold, not yet purchased, at fair value |  |  |  |  | 3
Investment Segment | Energy |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 62 |  | 62 |  | 708
Securities sold, not yet purchased, at fair value | 1,216 |  | 1,216 |  | 2,146
Investment Segment | Utilities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 882 |  | 882 |  | 1,012
Securities sold, not yet purchased, at fair value | 438 |  | 438 |  | 610
Investment Segment | Healthcare |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 384 |  | 384 |  | 440
Investment Segment | Technology |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities |  |  |  |  | 139
Investment Segment | Materials |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 357 |  | 357 |  | 52
Securities sold, not yet purchased, at fair value | 248 |  | 248 |  | 350
Investment Segment | Industrial |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity securities | 158 |  | 158 |  |
Securities sold, not yet purchased, at fair value | 163 |  | 163 |  | 138
Investment Segment | Debt securities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Debt Securities | 29 |  | 29 |  | 287
Investment Segment | Financials |  |  |  |  |
Schedule of Investments |  |  |  |  |
Debt Securities |  |  |  |  | 158
Investment Segment | Real Estate |  |  |  |  |
Schedule of Investments |  |  |  |  |
Debt Securities | 29 |  | 29 |  | 44
Investment Segment | Communications |  |  |  |  |
Schedule of Investments |  |  |  |  |
Debt Securities |  |  |  |  | 85
Investment Segment | Materials |  |  |  |  |
Schedule of Investments |  |  |  |  |
Securities sold, not yet purchased, at fair value | $ 63 |  | $ 63 |  | $ 185

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