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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 8,706 |  | $ 8,706 |  | $ 10,038
Securities sold, not yet purchased, at fair value | 368 |  | 368 |  | 1,023
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,132 |  | 8,132 |  | 9,532
Securities sold, not yet purchased, at fair value | 368 |  | 368 |  | 1,023
Portion of trading gains (loss) that relates to trading securities still held at balance sheet date | 345 | $ 388 | 397 | $ 622 |
Investment Segment | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 7,971 |  | 7,971 |  | 9,377
Securities sold, not yet purchased, at fair value | 368 |  | 368 |  | 988
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 161 |  | 161 |  | 155
Investment Segment | Basic materials | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 693 |  | 693 |  | 1,170
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,277 |  | 2,277 |  | 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 | 1,471 |  | 1,471 |  | 777
Securities sold, not yet purchased, at fair value | 104 |  | 104 |  | 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 | 1,606 |  | 1,606 |  | 1,489
Securities sold, not yet purchased, at fair value | 113 |  | 113 |  | 110
Investment Segment | Financial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 529 |  | 529 |  | 2,185
Investment Segment | Industrial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value | 77 |  | 77 |  | 110
Investment Segment | Technology | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,169 |  | 1,169 |  | 833
Investment Segment | Other | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 226 |  | $ 226 |  | 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 | 27.90% |  | 27.90% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (106) | (142) | $ (158) | (236) |
Fair value of equity method investment under fair value option | $ 359 |  | $ 359 |  | 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 | 17.10% |  | 17.10% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 173 | $ 241 | $ 717 | $ 423 |
Fair value of equity method investment under fair value option | $ 1,500 |  | $ 1,500 |  | $ 1,200

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