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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments |
Summary of the amortized cost and estimated fair value of short-term investments classified as trading securities |
|  | June 30, |  | December 31, |
(Millions of dollars) |  | 2018 |  | 2017 |
Domestic equity securities |  | $ | 772 |  | $ | 752 |
Foreign equity securities |  |  | 302 |  |  | 319 |
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  | 122 |  |  | 439 |
Collateralized loan obligations |  |  | 30 |  |  | 29 |
High yield securities |  |  | 21 |  |  | 21 |
Money market funds held in trading accounts |  |  | 10 |  |  | 10 |
Other trading securities |  |  | 7 |  |  | 6 |
Total trading short-term investments |  | $ | 1,264 |  | $ | 1,576 |

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