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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |  |
Investments | $ 8,337 | $ 10,015 |
Securities sold, not yet purchased, at fair value | 468 | 1,023 |
Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 6,867 | 9,532 |
Securities sold, not yet purchased, at fair value | 468 | 1,023 |
Portion of unrealized (losses) gains that relates to equity and debt securities still held | (800) | 1,413 | $ 340
Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 6,686 | 9,377 |
Securities sold, not yet purchased, at fair value | 468 | 988 |
Investment Segment | Debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 181 | 155 |
Basic materials | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 414 | 1,170 |
Consumer, non-cyclical | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,161 | 2,551 |
Securities sold, not yet purchased, at fair value | 57 | 101 |
Consumer, cyclical | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,161 | 777 |
Securities sold, not yet purchased, at fair value | 106 | 667 |
Consumer, cyclical | Investment Segment | Debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 0 | 35 |
Energy | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,598 | 1,489 |
Securities sold, not yet purchased, at fair value | 305 | 110 |
Financial | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 167 | 2,185 |
Industrial | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 0 | 110 |
Technology | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,040 | 833 |
Other sectors | Investment Segment | Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 145 | 372 |
Herbalife | Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Ownership percentage in equity method investment | 18.10% |  |
Unrealized gain on equity method investments under fair value option | $ 864 | 357 | (113)
Fair value of equity method investment under fair value option | $ 1,700 | 1,200 |
Hertz | Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Ownership percentage in equity method investment | 27.90% |  |
Unrealized gain on equity method investments under fair value option | $ (197) | 13 | $ (389)
Fair value of equity method investment under fair value option | $ 320 | $ 517 |

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