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Investments and Related Matters (Tables) | 9 Months Ended
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Sep. 30, 2018
Investment Segment |
Schedule of Investments [Line Items] |
Investments |
| September 30, 2018 |  | December 31, 2017
Assets | (in millions)
Investments: |  |  |
Equity securities: |  |  |
Basic materials | $ | 559 |  |  | $ | 1,170 |
Consumer, non-cyclical | 2,402 |  |  | 2,551 |
Consumer, cyclical | 1,378 |  |  | 777 |
Energy | 1,870 |  |  | 1,489 |
Financial | 477 |  |  | 2,185 |
Technology | 1,603 |  |  | 833 |
Other | 212 |  |  | 372 |
| 8,501 |  |  | 9,377 |
Corporate debt securities | 210 |  |  | 155 |
| $ | 8,711 |  |  | $ | 9,532 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value: |  |  |
Equity securities: |  |  |
Consumer, non-cyclical | $ | 74 |  |  | $ | 101 |
Consumer, cyclical | 122 |  |  | 667 |
Energy | 362 |  |  | 110 |
Industrial | 67 |  |  | 110 |
| 625 |  |  | 988 |
Corporate debt securities | — |  |  | 35 |
| $ | 625 |  |  | $ | 1,023 |
Other Segments |
Schedule of Investments [Line Items] |
Investments |
| September 30, 2018 |  | December 31, 2017
| (in millions)
Equity method investments | $ | 127 |  |  | $ | 106 |
Other investments (measured at fair value) | 494 |  |  | 400 |
| $ | 621 |  |  | $ | 506 |

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