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Investments (Tables) | 6 Months Ended
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Jun. 27, 2020
Investments |
Summary of the estimated fair value of short-term investments classified as trading securities | ​
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​ | ​ | June 27, | ​ | December 31, |
(Millions of dollars) |  | 2020 | ​ | 2019 |
Domestic equity securities | ​ | $ | 546 | ​ | $ | 706 | ​
Domestic debt securities | ​ | ​ | 389 | ​ | ​ | 409 | ​
Foreign equity securities | ​ |  | 100 | ​ |  | 189 | ​
Foreign debt securities | ​ | ​ | 54 | ​ | ​ | 43 | ​
High yield securities | ​ | ​ | 46 | ​ | ​ | 56 | ​
Money market funds held in trading accounts | ​ | ​ | 24 | ​ | ​ | 12 | ​
Collateralized loan obligations | ​ |  | 14 | ​ |  | 15 | ​
Other trading securities | ​ | ​ | 5 | ​ | ​ | 4 | ​
Total trading short-term investments | ​ | $ | 1,178 | ​ | $ | 1,434 | ​

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI http://asc.fasb.org/topic&trid=2197064 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI http://asc.fasb.org/topic&trid=75115024 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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