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Investments - Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |
Investments | $ 11,480 |  | $ 8,913
Securities sold, not yet purchased, at fair value | 4,863 |  | 2,521
Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 10,926 |  | 8,239
Securities sold, not yet purchased, at fair value | 4,863 |  | 2,521
Unrealized gain (loss) on debt and equity securities still held | 1,122 | $ (4,170) |
Investment Segment | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 10,795 |  | 8,118
Investment Segment | Consumer, non-cyclical |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,079 |  | 1,548
Securities sold, not yet purchased, at fair value | 971 |  | 424
Investment Segment | Consumer, cyclical |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,572 |  | 2,073
Securities sold, not yet purchased, at fair value | 405 |  | 572
Investment Segment | Energy |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 3,703 |  | 2,654
Securities sold, not yet purchased, at fair value | 3,091 |  | 1,476
Investment Segment | Utilities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 658 |  | 107
Securities sold, not yet purchased, at fair value | 396 |  | 49
Investment Segment | Technology |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,589 |  | 1,578
Investment Segment | Industrial |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 194 |  | 158
Investment Segment | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 131 |  | $ 121

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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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