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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |  |
Investments | $ 10,087 |  | $ 9,881
Securities sold, not yet purchased, at fair value | 2,192 |  | 1,139
Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 9,430 |  | 9,213
Securities sold, not yet purchased, at fair value | 2,192 |  | 1,139
Portion of trading gains (loss) that relates to trading securities still held at balance sheet date | 444 | $ (174) |
Investment Segment | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 9,154 |  | 9,023
Securities sold, not yet purchased, at fair value | 2,139 |  | 1,087
Investment Segment | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 276 |  | 190
Investment Segment | Basic materials | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 975 |  | 963
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,896 |  | 2,677
Securities sold, not yet purchased, at fair value | 71 |  | 0
Investment Segment | Consumer, cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 1,880 |  | 968
Investment Segment | Consumer, cyclical | Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 53 |  | 52
Investment Segment | Energy | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,479 |  | 1,278
Securities sold, not yet purchased, at fair value | 100 |  | 19
Investment Segment | Financial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 2,280 |  | 2,385
Investment Segment | Industrial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 88 |  | 100
Investment Segment | Technology | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 847 |  | 911
Investment Segment | Other | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 677 |  | 802
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 | 28.20% |  |
Unrealized gain on equity method investments under fair value option | $ (94) |  |
Fair value of equity method investment under fair value option | 411 |  | 505
Herbalife | Investment Segment |  |  |
Schedule of Investments [Line Items] |  |  |
Unrealized gain on equity method investments under fair value option | (182) |  |
Fair value of equity method investment under fair value option | $ 1,100 |  | $ 867

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