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Investments and Related Matters (Tables) | 3 Months Ended
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Mar. 31, 2019
Investment Segment |
Schedule of Investments [Line Items] |
Investments |
| March 31, 2019 |  | December 31, 2018
Assets | (in millions)
Investments: |  |  |
Equity securities: |  |  |
Basic materials | $ | 456 |  |  | $ | 414 |
Consumer, non-cyclical | 2,005 |  |  | 2,161 |
Consumer, cyclical | 1,627 |  |  | 1,161 |
Energy | 1,654 |  |  | 1,598 |
Financial | 209 |  |  | 167 |
Technology | 819 |  |  | 1,040 |
Other | 175 |  |  | 145 |
| 6,945 |  |  | 6,686 |
Corporate debt securities | 185 |  |  | 181 |
| $ | 7,130 |  |  | $ | 6,867 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value: |  |  |
Equity securities: |  |  |
Consumer, non-cyclical | $ | 42 |  |  | $ | 57 |
Consumer, cyclical | 96 |  |  | 106 |
Energy | 309 |  |  | 305 |
| 447 |  |  | 468 |
Corporate debt securities | — |  |  | — |
| $ | 447 |  |  | $ | 468 |
Other Segments and Holding Company |
Schedule of Investments [Line Items] |
Investments |
| March 31, 2019 |  | December 31, 2018
| (in millions)
Equity method investments | $ | 169 |  |  | $ | 143 |
Other investments (measured at fair value) | 804 |  |  | 1,327 |
| $ | 973 |  |  | $ | 1,470 |

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