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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments |
Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities |
|  | December 31, 2016 |  | December 31, 2015 |
|  | Amortized |  | Fair |  | Amortized |  | Fair |
(Millions of dollars) |  | Cost |  | Value |  | Cost |  | Value |
Money market funds |  | $ | — |  | $ | — |  | $ | 81 |  | $ | 81 |
Total available-for-sale short-term investments |  |  | — |  |  | — |  |  | 81 |  |  | 81 |
Domestic equity securities |  |  | 444 |  |  | 482 |  |  | 475 |  |  | 466 |
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  | 437 |  |  | 437 |  |  | 452 |  |  | 450 |
Foreign equity securities |  |  | 198 |  |  | 199 |  |  | 120 |  |  | 120 |
High yield securities |  |  | 114 |  |  | 115 |  |  | 108 |  |  | 104 |
Collateralized loan obligations |  |  | 25 |  |  | 26 |  |  | 10 |  |  | 10 |
Money market funds held in trading accounts |  |  | 13 |  |  | 13 |  |  | 22 |  |  | 22 |
Other trading securities |  |  | 5 |  |  | 5 |  |  | 1 |  |  | 1 |
Total trading short-term investments |  |  | 1,236 |  |  | 1,277 |  |  | 1,188 |  |  | 1,173 |
Total short-term investments |  | $ | 1,236 |  | $ | 1,277 |  | $ | 1,269 |  | $ | 1,254 |

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