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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2020 | Dec. 31, 2021
Schedule of Investments |  |  |  |  |
Investments | $ 4,877 |  | $ 4,877 |  | $ 9,151
Securities sold, not yet purchased, at fair value | 5,382 |  | 5,382 |  | 5,340
Investment Segment |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 4,786 |  | 4,786 |  | 8,952
Securities sold, not yet purchased, at fair value | 5,382 |  | 5,382 |  | 5,340
Portion of unrealized (losses) gains that relates to equity and debt securities still held | (250) | $ (204) | (1,172) | $ 1,384 |
Investment Segment | Equity securities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 4,749 |  | 4,749 |  | 8,838
Securities sold, not yet purchased, at fair value | 5,225 |  | 5,225 |  | 5,340
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 37 |  | 37 |  | 114
Securities sold, not yet purchased, at fair value | 157 |  | 157 |  |
Investment Segment | Communication |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 317 |  | 317 |  | 352
Investment Segment | Consumer, non-cyclical |  |  |  |  |
Schedule of Investments |  |  |  |  |
Securities sold, not yet purchased, at fair value | 753 |  | 753 |  |
Investment Segment | Consumer, cyclical |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 666 |  | 666 |  | 1,281
Securities sold, not yet purchased, at fair value | 499 |  | 499 |  | 848
Investment Segment | Energy |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 1,067 |  | 1,067 |  | 3,184
Securities sold, not yet purchased, at fair value | 2,180 |  | 2,180 |  | 2,028
Investment Segment | Utilities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 1,163 |  | 1,163 |  | 992
Securities sold, not yet purchased, at fair value | 818 |  | 818 |  | 659
Investment Segment | Healthcares |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 341 |  | 341 |  | 1,009
Securities sold, not yet purchased, at fair value | 319 |  | 319 |  | 1,049
Investment Segment | Technology |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 634 |  | 634 |  | 931
Investment Segment | Materials |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 143 |  | 143 |  | 194
Securities sold, not yet purchased, at fair value | 372 |  | 372 |  | 365
Investment Segment | Industrial |  |  |  |  |
Schedule of Investments |  |  |  |  |
Investments | 418 |  | 418 |  | 895
Securities sold, not yet purchased, at fair value | $ 284 |  | $ 284 |  | $ 391

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