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Investments and Related Matters (Tables) | 3 Months Ended
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Mar. 31, 2018
Investment Segment |
Schedule of Investments [Line Items] |
Investment [Table Text Block] |
| March 31, 2018 |  | December 31, 2017
Assets | (in millions)
Investments: |  |  |
Equity securities: |  |  |
Basic materials | $ | 705 |  |  | $ | 1,170 |
Consumer, non-cyclical | 2,628 |  |  | 2,551 |
Consumer, cyclical | 1,261 |  |  | 777 |
Energy | 1,453 |  |  | 1,489 |
Financial | 149 |  |  | 2,185 |
Technology | 956 |  |  | 833 |
Other | 208 |  |  | 372 |
| 7,360 |  |  | 9,377 |
Corporate debt securities | 158 |  |  | 155 |
| $ | 7,518 |  |  | $ | 9,532 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value: |  |  |
Equity securities: |  |  |
Consumer, non-cyclical | $ | 86 |  |  | $ | 101 |
Consumer, cyclical | 127 |  |  | 667 |
Energy | — |  |  | 110 |
Industrial | 68 |  |  | 110 |
| 281 |  |  | 988 |
Corporate debt securities | 18 |  |  | 35 |
| $ | 299 |  |  | $ | 1,023 |
Other Segments |
Schedule of Investments [Line Items] |
Investment [Table Text Block] |
| March 31, 2018 |  | December 31, 2017
| (in millions)
Equity method investments | $ | 417 |  |  | $ | 430 |
Other investments (measured at fair value) | 429 |  |  | 407 |
| $ | 846 |  |  | $ | 837 |

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