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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |
Investments | $ 8,197 |  | $ 9,945
Securities sold, not yet purchased, at fair value | 459 |  | 1,190
Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 7,519 |  | 9,207
Securities sold, not yet purchased, at fair value | 459 |  | 1,190
Unrealized gain (loss) on debt and equity securities still held | (4,170) | $ 558 |
Investment Segment | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 7,420 |  | 9,062
Investment Segment | Basic materials |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 181 |  | 281
Securities sold, not yet purchased, at fair value | 23 |  | 209
Investment Segment | Consumer, non-cyclical |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,478 |  | 2,085
Securities sold, not yet purchased, at fair value |  |  | 29
Investment Segment | Consumer, cyclical |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,881 |  | 2,427
Securities sold, not yet purchased, at fair value | 188 |  | 379
Investment Segment | Energy |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,758 |  | 1,717
Securities sold, not yet purchased, at fair value |  |  | 124
Investment Segment | Financial |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 84 |  | 152
Investment Segment | Technology |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,061 |  | 2,425
Securities sold, not yet purchased, at fair value | 138 |  | 217
Investment Segment | Industrial |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 61 |  | 127
Investment Segment | Communication |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 26 |  | 80
Investment Segment | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 99 |  | $ 145

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- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
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