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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |
Investments | $ 8,364 |  | $ 10,369
Securities sold, not yet purchased, at fair value | 299 |  | 1,023
Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 7,518 |  | 9,532
Securities sold, not yet purchased, at fair value | 299 |  | 1,023
Portion of trading gains (loss) that relates to trading securities still held at balance sheet date | 175 | $ 444 |
Investment Segment | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 7,360 |  | 9,377
Securities sold, not yet purchased, at fair value | 281 |  | 988
Investment Segment | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 158 |  | 155
Investment Segment | Basic materials | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 705 |  | 1,170
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,628 |  | 2,551
Securities sold, not yet purchased, at fair value | 86 |  | 101
Investment Segment | Consumer, cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,261 |  | 777
Securities sold, not yet purchased, at fair value | 127 |  | 667
Investment Segment | Consumer, cyclical | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 18 |  | 35
Investment Segment | Energy | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,453 |  | 1,489
Securities sold, not yet purchased, at fair value | 0 |  | 110
Investment Segment | Financial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 149 |  | 2,185
Investment Segment | Industrial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 68 |  | 110
Investment Segment | Technology | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 956 |  | 833
Investment Segment | Other | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 208 |  | 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 | 28.00% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (52) | (94) |
Fair value of equity method investment under fair value option | $ 465 |  | 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 | 20.90% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 544 | $ 182 |
Fair value of equity method investment under fair value option | $ 1,800 |  | $ 1,200

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