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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |
Investments | $ 9,881 | $ 15,351
Securities sold, not yet purchased, at fair value | 1,139 | 794
Investment Segment |  |
Schedule of Investments [Line Items] |  |
Investments | 9,213 | 14,553
Securities sold, not yet purchased, at fair value | 1,139 | 794
Portion of trading (losses) gains that relates to trading securities still held at balance sheet date | 340 | (2,200)
Unrealized Gain on Securities | (502) |
Fair Value of Equity Method Investment Under Fair Value Option | 1,400 |
Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 9,023 | 14,324
Securities sold, not yet purchased, at fair value | 1,087 | 794
Investment Segment | Debt securities |  |
Schedule of Investments [Line Items] |  |
Investments | 190 | 72
Basic materials | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 963 | 563
Communications | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 169 | 407
Consumer, non-cyclical | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 2,677 | 3,684
Consumer, cyclical | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 408 | 115
Securities sold, not yet purchased, at fair value | 968 | 794
Consumer, cyclical | Investment Segment | Debt securities |  |
Schedule of Investments [Line Items] |  |
Investments | 186 | 55
Securities sold, not yet purchased, at fair value | 52 | 0
Diversified | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 7 | 17
Energy | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 1,278 | 1,461
Securities sold, not yet purchased, at fair value | 19 | 0
Financial | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 2,385 | 2,094
Financial | Investment Segment | Debt securities |  |
Schedule of Investments [Line Items] |  |
Investments | 4 | 4
Financial | Investment Segment | Mortgage backed securities |  |
Schedule of Investments [Line Items] |  |
Investments | 0 | 157
Industrial | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 214 | 188
Securities sold, not yet purchased, at fair value | 100 | 0
Technology | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | 911 | 5,795
Sovereign debt | Investment Segment | Debt securities |  |
Schedule of Investments [Line Items] |  |
Investments | 0 | 13
Utilities | Investment Segment | Equity securities |  |
Schedule of Investments [Line Items] |  |
Investments | $ 11 | $ 0
Herbalife | Investment Segment |  |
Schedule of Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 24.20% |
Hertz | Investment Segment |  |
Schedule of Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 35.30% |

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