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Investments Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 9,437 |  | $ 9,437 |  | $ 8,337
Securities sold, not yet purchased, at fair value | 223 |  | 223 |  | 468
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,718 |  | 8,718 |  | 6,867
Securities sold, not yet purchased, at fair value | 223 |  | 223 |  | 468
Unrealized gain (loss) on debt and equity securities still held | (513) | $ (4) | (99) | $ 356 |
Investment Segment | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,549 |  | 8,549 |  | 6,686
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 169 |  | 169 |  | 181
Investment Segment | Basic materials | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 262 |  | 262 |  | 414
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,704 |  | 1,704 |  | 2,161
Securities sold, not yet purchased, at fair value | 12 |  | 12 |  | 57
Investment Segment | Consumer, cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,149 |  | 2,149 |  | 1,161
Securities sold, not yet purchased, at fair value | 93 |  | 93 |  | 106
Investment Segment | Energy | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,943 |  | 1,943 |  | 1,598
Securities sold, not yet purchased, at fair value | 118 |  | 118 |  | 305
Investment Segment | Financial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 264 |  | 264 |  | 167
Investment Segment | Technology | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,092 |  | 2,092 |  | 1,040
Investment Segment | Other | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 135 |  | $ 135 |  | 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 | 23.50% |  | 23.50% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (29) | 23 | $ 39 | (135) |
Fair value of equity method investment under fair value option | $ 462 |  | $ 462 |  | 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 | 18.60% |  | 18.60% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (138) | $ 23 | $ (594) | $ 740 |
Fair value of equity method investment under fair value option | $ 1,100 |  | $ 1,100 |  | $ 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 | 13.50% |  | 13.50% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 26 |  | $ 301 |  |
Fair value of equity method investment under fair value option | $ 1,100 |  | $ 1,100 |  |

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