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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 9,987 |  | $ 9,987 |  | $ 15,351
Securities sold, not yet purchased, at fair value | 1,210 |  | 1,210 |  | 794
Investment Segment [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 9,317 |  | 9,317 |  | 14,553
Securities sold, not yet purchased, at fair value | 1,210 |  | 1,210 |  | 794
Portion of trading gains (loss) that relates to trading securities still held | 754 | $ (2,200) | 626 | $ (1,900) |
Investment Segment [Member] | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 9,028 |  | 9,028 |  | 14,324
Securities sold, not yet purchased, at fair value | 1,154 |  | 1,154 |  | 794
Investment Segment [Member] | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 289 |  | 289 |  | 72
Investment Segment [Member] | Basic materials | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 904 |  | 904 |  | 563
Investment Segment [Member] | Communications | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 176 |  | 176 |  | 407
Investment Segment [Member] | Consumer, non-cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,729 |  | 2,729 |  | 3,684
Securities sold, not yet purchased, at fair value | 4 |  | 4 |  | 794
Investment Segment [Member] | Consumer, non-cyclical | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 103 |  | 103 |  | 0
Investment Segment [Member] | Consumer, cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 298 |  | 298 |  | 115
Securities sold, not yet purchased, at fair value | 891 |  | 891 |  | 0
Investment Segment [Member] | Consumer, cyclical | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 170 |  | 170 |  | 55
Investment Segment [Member] | Diversified | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 19 |  | 19 |  | 17
Investment Segment [Member] | Energy | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,464 |  | 1,464 |  | 1,461
Securities sold, not yet purchased, at fair value | 14 |  | 14 |  | 0
Investment Segment [Member] | Energy | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value | 56 |  | 56 |  | 0
Investment Segment [Member] | Financial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,167 |  | 2,167 |  | 2,094
Securities sold, not yet purchased, at fair value | 129 |  | 129 |  | 0
Investment Segment [Member] | Financial | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 4 |  | 4 |  | 4
Investment Segment [Member] | Financial | Mortgage-backed securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 0 |  | 0 |  | 157
Investment Segment [Member] | Industrial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 240 |  | 240 |  | 188
Securities sold, not yet purchased, at fair value | 116 |  | 116 |  | 0
Investment Segment [Member] | Technology | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,031 |  | 1,031 |  | 5,795
Investment Segment [Member] | Sovereign debt | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 0 |  | 0 |  | 13
Investment Segment [Member] | Utilities | Corporate debt: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 12 |  | $ 12 |  | $ 0
Herbalife [Member] | Investment Segment [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 21.10% |  | 21.10% |  |
Unrealized gain on investment at fair value that would otherwise be accounted for under equity method | $ 52 |  | $ 119 |  |
Fair value of equity method investment under fair value option | $ 973 |  | $ 973 |  |

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