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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 9,332 |  | $ 9,332 |  | $ 10,038
Securities sold, not yet purchased, at fair value | 625 |  | 625 |  | 1,023
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,711 |  | 8,711 |  | 9,532
Securities sold, not yet purchased, at fair value | 625 |  | 625 |  | 1,023
Portion of unrealized gains (loss) that relates to securities still held at balance sheet date | (4) | $ 635 | 356 | $ 1,242 |
Investment Segment | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,501 |  | 8,501 |  | 9,377
Securities sold, not yet purchased, at fair value | 625 |  | 625 |  | 988
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 210 |  | 210 |  | 155
Investment Segment | Basic materials | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 559 |  | 559 |  | 1,170
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,402 |  | 2,402 |  | 2,551
Securities sold, not yet purchased, at fair value | 74 |  | 74 |  | 101
Investment Segment | Consumer, cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,378 |  | 1,378 |  | 777
Securities sold, not yet purchased, at fair value | 122 |  | 122 |  | 667
Investment Segment | Consumer, cyclical | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |  | 35
Investment Segment | Energy | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,870 |  | 1,870 |  | 1,489
Securities sold, not yet purchased, at fair value | 362 |  | 362 |  | 110
Investment Segment | Financial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 477 |  | 477 |  | 2,185
Investment Segment | Industrial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value | 67 |  | 67 |  | 110
Investment Segment | Technology | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,603 |  | 1,603 |  | 833
Investment Segment | Other | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 212 |  | $ 212 |  | 372
Hertz | Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 27.80% |  | 27.80% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 23 | 254 | $ (135) | 19 |
Fair value of equity method investment under fair value option | $ 382 |  | $ 382 |  | 517
Herbalife | Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 17.90% |  | 17.90% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 23 | $ (64) | $ 740 | $ 359 |
Fair value of equity method investment under fair value option | $ 1,500 |  | $ 1,500 |  | $ 1,200

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