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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |
Investments | $ 8,103 |  | $ 8,337
Securities sold, not yet purchased, at fair value | 447 |  | 468
Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 7,130 |  | 6,867
Securities sold, not yet purchased, at fair value | 447 |  | 468
Unrealized gain on debt and equity securities still held | 558 | $ 175 |
Investment Segment | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 6,945 |  | 6,686
Securities sold, not yet purchased, at fair value | 447 |  | 468
Investment Segment | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 185 |  | 181
Investment Segment | Basic materials | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 456 |  | 414
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,005 |  | 2,161
Securities sold, not yet purchased, at fair value | 42 |  | 57
Investment Segment | Consumer, cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,627 |  | 1,161
Securities sold, not yet purchased, at fair value | 96 |  | 106
Investment Segment | Consumer, cyclical | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0
Investment Segment | Energy | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,654 |  | 1,598
Securities sold, not yet purchased, at fair value | 309 |  | 305
Investment Segment | Financial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 209 |  | 167
Investment Segment | Technology | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 819 |  | 1,040
Investment Segment | Other | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 175 |  | 145
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 | 23.10% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 95 | (52) |
Fair value of equity method investment under fair value option | $ 337 |  | 320
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 | 18.40% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (168) | $ 544 |
Fair value of equity method investment under fair value option | $ 1,500 |  | $ 1,700
Caesars | Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 11.70% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 26 |  |
Fair value of equity method investment under fair value option | $ 690 |  |

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