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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 9,498 |  | $ 9,498 |  | $ 9,945
Securities sold, not yet purchased, at fair value | 1,819 |  | 1,819 |  | 1,190
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,681 |  | 8,681 |  | 9,207
Securities sold, not yet purchased, at fair value | 1,819 |  | 1,819 |  | 1,190
Unrealized gain (loss) on debt and equity securities still held | 2,566 | $ (118) | (1,066) | $ 434 |
Investment Segment | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,583 |  | 8,583 |  | 9,062
Investment Segment | Basic materials |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments |  |  |  |  | 281
Securities sold, not yet purchased, at fair value |  |  |  |  | 209
Investment Segment | Consumer, non-cyclical |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,724 |  | 1,724 |  | 2,085
Securities sold, not yet purchased, at fair value | 716 |  | 716 |  | 29
Investment Segment | Consumer, cyclical |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 3,037 |  | 3,037 |  | 2,427
Securities sold, not yet purchased, at fair value | 831 |  | 831 |  | 379
Investment Segment | Energy |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,634 |  | 2,634 |  | 1,717
Securities sold, not yet purchased, at fair value | 123 |  | 123 |  | 124
Investment Segment | Financial |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  | 152
Investment Segment | Technology |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,115 |  | 1,115 |  | 2,425
Securities sold, not yet purchased, at fair value | 149 |  | 149 |  | 217
Investment Segment | Industrial |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 73 |  | 73 |  | 127
Investment Segment | Communication |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  | 80
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 98 |  | $ 98 |  | $ 145

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