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Investments and Related Matters (Tables) | 9 Months Ended
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Sep. 30, 2017
Investment Segment |
Schedule of Investments [Line Items] |
Investment [Table Text Block] |
| September 30, 2017 |  | December 31, 2016
Assets | (in millions)
Investments: |  |  |
Equity securities: |  |  |
Basic materials | $ | 867 |  |  | $ | 963 |
Consumer, non-cyclical | 2,459 |  |  | 2,677 |
Energy | 1,178 |  |  | 1,278 |
Financial | 2,111 |  |  | 2,385 |
Technology | 908 |  |  | 911 |
Other | 1,020 |  |  | 809 |
| 8,543 |  |  | 9,023 |
Corporate debt securities | 473 |  |  | 190 |
| $ | 9,016 |  |  | $ | 9,213 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value: |  |  |
Equity securities: |  |  |
Consumer, non-cyclical | $ | 219 |  |  | $ | — |
Consumer, cyclical | 798 |  |  | 968 |
Energy | 94 |  |  | 19 |
Industrial | 102 |  |  | 100 |
| 1,213 |  |  | 1,087 |
Corporate debt securities | 45 |  |  | 52 |
| $ | 1,258 |  |  | $ | 1,139 |
Other Segments |
Schedule of Investments [Line Items] |
Investment [Table Text Block] |
| September 30, 2017 |  | December 31, 2016
| (in millions)
Equity method investments | $ | 332 |  |  | $ | 302 |
Other investments (measured at fair value) | 400 |  |  | 366 |
| $ | 732 |  |  | $ | 668 |

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