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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 5,812 |  | $ 5,812 |  | $ 9,151
Securities sold, not yet purchased, at fair value | 4,062 |  | 4,062 |  | 5,340
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 5,720 |  | 5,720 |  | 8,952
Securities sold, not yet purchased, at fair value | 4,062 |  | 4,062 |  | 5,340
Portion of unrealized (losses) gains that relates to equity and debt securities still held | (894) | $ 491 | (694) | $ 1,593 |
Investment Segment | Equity securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 5,683 |  | 5,683 |  | 8,838
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 37 |  | 37 |  | 114
Investment Segment | Communication |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 357 |  | 357 |  | 352
Investment Segment | Consumer, cyclical |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 831 |  | 831 |  | 1,281
Securities sold, not yet purchased, at fair value | 401 |  | 401 |  | 848
Investment Segment | Energy |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,387 |  | 1,387 |  | 3,184
Securities sold, not yet purchased, at fair value | 1,901 |  | 1,901 |  | 2,028
Investment Segment | Utilities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,173 |  | 1,173 |  | 992
Securities sold, not yet purchased, at fair value | 852 |  | 852 |  | 659
Investment Segment | Healthcares |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 392 |  | 392 |  | 1,009
Securities sold, not yet purchased, at fair value | 400 |  | 400 |  | 1,049
Investment Segment | Technology |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 736 |  | 736 |  | 931
Investment Segment | Materials |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 179 |  | 179 |  | 194
Securities sold, not yet purchased, at fair value | 254 |  | 254 |  | 365
Investment Segment | Industrial |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 628 |  | 628 |  | 895
Securities sold, not yet purchased, at fair value | $ 254 |  | $ 254 |  | $ 391

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