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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 10,903 |  | $ 10,903 |  | $ 8,913
Securities sold, not yet purchased, at fair value | 4,231 |  | 4,231 |  | 2,521
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 10,603 |  | 10,603 |  | 8,239
Securities sold, not yet purchased, at fair value | 4,231 |  | 4,231 |  | 2,521
Unrealized gain (loss) on debt and equity securities still held | 491 | $ 2,566 | 1,593 | $ (1,066) |
Investment Segment | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 10,487 |  | 10,487 |  | 8,118
Investment Segment | Consumer, non-cyclical |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 566 |  | 566 |  | 1,548
Securities sold, not yet purchased, at fair value | 202 |  | 202 |  | 424
Investment Segment | Consumer, cyclical |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,660 |  | 2,660 |  | 2,073
Securities sold, not yet purchased, at fair value | 607 |  | 607 |  | 572
Investment Segment | Energy |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 3,237 |  | 3,237 |  | 2,654
Securities sold, not yet purchased, at fair value | 2,143 |  | 2,143 |  | 1,476
Investment Segment | Utilities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 706 |  | 706 |  | 107
Securities sold, not yet purchased, at fair value | 422 |  | 422 |  | 49
Investment Segment | Healthcare |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,025 |  | 1,025 |  |
Securities sold, not yet purchased, at fair value | 674 |  | 674 |  |
Investment Segment | Technology |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,848 |  | 1,848 |  | 1,578
Investment Segment | Materials |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 187 |  | 187 |  |
Securities sold, not yet purchased, at fair value | 183 |  | 183 |  |
Investment Segment | Industrial |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 258 |  | 258 |  | 158
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 116 |  | $ 116 |  | $ 121

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